If this happens often, it may be because of problems within the fuel pump. When the key is turned on, the fuel pump is activated and pressurized, which can be heard as a quiet whine or hum in some cars. This is not beginner auto mechanics and often require the use of an OEM scan tool or at least a professional OBD2 scanner with special features enabled. On some vehicle models, insufficient engine oil pressure will keep the engine from starting to prevent engine damage. Fuel System Leaks. Usually, the vehicle will put itself on “LIMP” mode and will most of the time indicate LIMP (or something similar depending on the manufacturer) on the dashboard. The fuel pump relay is an important component of the fuel system of your vehicle.. If you went to auto mechanic trade school, you learned how to follow a standard procedure to identify an electrical problem. A4 Fuel Pump 2005-2007 (B7) Complete with Housing - for 1.8T/ 2.0 (not suitable for TFSI models) R1,899.00. A trick-of-the-trade here is to use a soft-face hammer to hit under the tank. Most modern vehicles use electric fuel pumps, but anyone who works on older models and classic cars must be familiar with mechanical fuel pumps. Another symptom commonly associated with a problematic fuel pump is difficulty starting. Here’s how to open the fuel door and get the gas cap off: Make sure you’re stopped.... less than 1/4 of a tank of fuel in your car. (Worth mentioning, some relays are also controlled by the ECM.). Until then, we still have to work on cars who rely on a good ol‘ fuel pump to feed their engine with petrol. It sounds like your ignition cylinder may have seized up. If it does not start, you could still have a bad pump, or you have another issue like lack of spark to the spark plugs.. In this guide, you will learn about fuel pump problems and the fuel pump module known as the EKPS module. I Think the Mechanical Fuel Pump Is the Culprit! First, scan the car and read the DTCs. My problems started quite a while ago, we replaced the fuel pump with a fake one; Since then we've had to treat quater tank as empty (Cant actually remember if … And with the price of fuel these days, everything making your car more efficient is a no-brainer! We didn’t do a whole lot of diagnosis for reasons I will explain. Usually, a bad or failing fuel pump will produce one or more of the following 8 symptoms that alert the driver of a potential issue. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical guides, Check cars for recalls, common issues & maintenance costs, Hand-picked, community-rated professionals, Our mechanics make house calls in over 2,000 cities, Explore nationwide job opportunities for automotive technicians, Trusted mechanics, rated by thousands of happy car owners, Fleet maintenance with certified mobile mechanics. Always make sure to follow all high-pressure fuel system depressurization procedures before servicing. As the fuel pump relay controls power to the fuel pump, any faults with it can cause issues with the fuel pump, which can cause drivability problems for the vehicle. This is usually a sign that the fuel pump is almost at the end of its life. This will also require an OEM scan tool or a visit to the dealership for a quick reflash. Most of the time, a code is recorded whenever the vehicle enters LIMP mode. It varies. Manufacturers won’t necessarily call every car owner to get the latest version installed every time a new update is released. In modern fuel injected vehicles, the fuel pump sits right in the fuel tank and “pushes” the gasoline to the fuel rail (s). Engine Sputters at High Speeds. The fuel pump is typically located right below the rear seat. The main type of fuel pumps are:eval(ez_write_tag([[300,250],'themechanicdoctor_com-medrectangle-4','ezslot_3',123,'0','0'])); Mechanical pumps were mostly found in old carburetors engines. Sputtering Under Acceleration Electronic Fuel Pump Problems and Replacement Also see: Jeep Cherokee fuel pump replacement Minivan fuel pump / gas tank replacement Warning. There’s a lot of different types of automotive fuel pumps but they all have one thing in common. This problem is caused when the fuel pump can’t deliver a smooth flow of fuel to the engine; periodically, your engine receives only air when it was expecting to receive fuel. Proper maintenance is absolutely crucial with GDI systems. It may seem counter-intuitive since electricity produces sparks and sparks and fuel don’t mix well, but liquid fuel is actually non-flammable making it a lot safer than having it near the engine where fuel leaks could easily catch on fire. But won't catch. Another more serious symptom of an issue with the fuel pump is a no-start condition. Not sure you got it right? Most fuel pumps will produce a quiet hum during their normal operation, however, an excessively loud whine coming from the fuel tank is usually a sign of a problem. There no easy way to really identify a mechanical problem, other than checking the fuel pressure with a fuel pressure gauge. Gasoline, these days, is cleaner than ever and finding dirt in a tank is unusual. Good luck friend and it's also common for the wire harness from the frame to the fuel pump to go bad due to corrosion from the bad weather we get in the winter and rainy spring and fall. All you have to do is to replace the fuel pump assembly once again. document.write(new Date().getFullYear()) Virtually all modern vehicles with internal combustion engines come equipped with fuel pumps. July 26, 2019 Published by admin Leave your thoughts. If everything is good up to now, you need to get to the connector of the fuel pump and test it for power and ground. This problem is typical for fuel pumps combined with the fuel gauge sender in one plastic housing. Changing the fuel pump on a BMW E60 model can be challenging if you have not replaced it a few times in the past or don’t understand the system. If you press the accelerator and feel that your car has hiccups, you may have problems with the fuel pump. Is The Problem The Fuel Or The Fuel Pump: If the engine lags during acceleration after having idled for a long time then you may be experiencing vapor lock. mark – 21 October, 2014. If the fuel pump is the cause, it means it can no longer regulate fuel pressure accurately and provide the appropriate amount of fuel to the engine. A clean diesel fuel pump injector is a happy diesel fuel pump injector. Let’s take a look at 4 common fuel injector pump complications. 2015-2021 The Mechanic Doctor. A valve within the fuel pump may not be opening, causing more fuel than necessary to pour into the engine system. Fuel pumps are found on virtually all internal combustion engine-equipped vehicles in one form or another. In these circumstances, the car will feel like it is unable to go or maintain the intended amount of power. This sputter occurs when the pump is struggling to deliver a constant stream of pressurized fuel to the engine. It all started when we crested a hill after a long … The fuel pump cannot be reset; if the pump has quit or the pressure is low, the fuel pump is dead. If the internal circuit of the pump is ok,  something mechanical may still be broken inside. If a sensor is misreading any value, the pump won’t be able to work correctly and the vehicle could enter LIMP mode. The problem with fuel pumps usually occurs after reaching 100,000 miles. Direct-injection (GDI) high-pressure pumps, Test for power at the malfunctioning component. You’ve got an electrical short or open circuit somewhere and you’ll have to follow the wires, testing for power and ground until you find that faulty wire or connector. As an auto mechanic, you’ll have to work on cars with a “crank/no start” condition, which could eventually be caused by a faulty fuel pump. The device basically puts pressure on the fuel system of your vehicle within a few seconds before the level of oil pressure takes over the fuel system in order to help the system start your vehicle upon ignition. Almost any internal combustion engine gets its fuel from a fuel pump of some kind but we’ll stay focused on automotive fuel pump here. One of the best indicators of a failing fuel pump is found on the open road. Irregular resistance inside the fuel pump motor may cause vehicle surging, and indicates a fuel pump in need of repair. If a car is moving at an accelerated speed, perhaps above 50 miles an hour, and the vehicle starts jerking and then resumes regular performance, it might not be a bad spark plug. George, in spite of taking over his father's business, Lilly & Skinner footwear distributors, had a better idea for a carburetor in the early automotive days. Electrical fuel pumps also use a relay and a fuse. The Cadillac fuel pump relay is located in the rear fuse block which is in the left rear of the passenger compartment, under the rear seat. Fuel systems are complex systems and they tend to become a little more complex every year. This allows the EMS (engine management system) to continually adjust the air/fuel ratio in real-time, resulting in lower fuel consumption while producing a higher power output. My fuel pump has been cutting out when I’m driving and I think it’s one of two things. The most popular service booked by readers of this article is Fuel System Inspection. 29 Posts . YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. If you notice any signs like that, checking your fuel pump for pressure and fuel pump relay is highly advisable. I say “pleasure” because direct-injection is a lot more efficient than any other fuel system made to date. There was a clicking in dash above cluster that occurred with key on. The fuel pump connector was completely melted, and three inches of insulation on each wire was burned off. Electrical pumps are also more efficient because of the lack of resistance caused by moving mechanical components. The problem can be intermittent and the engine will jerk, stall, start again, jerk some more, and so on. Most mechanical fuel pumps have a weep hole on the bottom of the unit. It eventually stopped. Replaced fuel pump, checked fuses/relays. I trust him for any future from your mechanic. Our certified mobile mechanics perform over 600 services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools. Maybe soon but not yet. The car can begin to feel like it’s losing power when driving uphill. However, if you stopped hearing the familiar motor sound of the fuel pump prior to that, you’re most likely looking at a fuel pump problem. Hence, it will need more fuel. However, it occurs at a random, consistent speed. When the fuel pump relay fails and your car still starts (it may not), you will probably have issues with poor acceleration, stalling, or stuttering. YourMechanic All rights reserved. Also please check out the statistics and reliability analysis of Toyota Avalon based on all problems reported for the Avalon. Problem #1 – Dirty Fuel. Reduced pressure can also lead to overheating which could damage the pump and the whole fuel system even more. If your car has a fuel pump, you must keep it in good working condition. Discussion Starter • #1 • 7 mo ago. We had problems with our fuel pump. Anyway, here are the most common problems for the two main fuel pump types, the most common bad fuel pump symptoms, how to correctly identify the problem and how to fix it. Testing your Grand Marquis’s fuel pressure on each side of the pump would be the best way to diagnose this problem. It’s not a common problem but, sometimes, the fuel pump could start to make a loud whining noise. Fuel checked all the sensors. Repairs covered by 12-month/12,000-mile warranty. Another can go 180,000 miles. If either the relay or the fuse blows, the car will stall as if it has run out of gas. Whining is a common car noise that cars make when being shifted from gear to gear. Some duel fuel systems(the bad ones) turn off the fuel pump when running on LPG, this causes gum residue to accumulate in the fuel rail as well as the pump causing premature failure. As fuel pump began to fail (intermittent starting problems), it caused wires going to fuel pump (wires are inside the gas tank) to overheat. 2005 hyundai accent gs. And it all starts with subpar diesel fuel. This is usually a sign that the fuel pump is almost at the end of its life. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old. In this article, I will be explaining to you how the fuel pump actually works, what possible fault codes you might encounter and how to properly diagnose the system plus show you how to replace it. Some newer car can record a code when the fuel pump is not working correctly, giving you a good idea of where to go next…. Even though this pump is electrical, the pump action is actually created by moving mechanical parts and everything in motion is prone to wear and abrasion. 5. This and other issues can cause the owner a great deal of stress and expense. The most recently reported issues are listed below. The fuel pump is responsible for delivering fuel from the gas tank to the engine at the appropriate pressure required for performance demands. It's important to familiarize yourself with the warning signs of a faulty fuel pump—that way you can address any problems before it's too late. Fuel consumption can also go up for no apparent reason. I would probably replace the whole pump assembly anyway unless your fuel pump has already been replaced in the last 6 month. Anyway, you won’t see those pretty often unless you work on old muscle cars or marine engines. This causes cracks to … It may not be super useful knowledge for today’s technicians but knowledge is never wasted. A weakened fuel pump can cause the vehicle to take more cranks to start than normal, and in more serious cases may even cause the vehicle to require multiple turns of the key before it will start. If everything seems alright, the problem is most likely an internal mechanical problem with the fuel pump. According to the Toyota fuel pump recalls, the impellers are low-density and were exposed to production solvent drying for long periods of time. Common signs include a whining noise, hard starting, engine performance issues, and an inability to start the car. Most fuel pumps are built to last. Fuel pressure is good. In this case, the fuel pump cannot provide a constant stream of fuel to the engine at the ideal pressure. Finally, if everything else fails, take some time to make sure the ECM software’s version is up to date with the latest update available because everything is ultimately controlled by the ECM. Toyota Avalon owners have reported 2 problems related to fuel pump (under the gasoline fuel system category). Add to Wish List Add to Compare. Fuel pump test. Overheating will reduce the lubricant property of engine oil and will cause a metal to metal contact. Working with gasoline is inherently dangerous, as is working underneath a vehicle. But as with everything within the auto mechanic world, it’s not necessary that simple. Once the problem has been diagnosed, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. Test your car in different gears and check the fluids. Toyota Fuel pump problems can bring a car to a standstill. If you don’t, let me demonstrate it quickly: First, make sure the problem is present. All good. The car will turn over but will not start checked the fuel pump. When the key is in the ON or RUN position, it is absolutely normal to hear a slight buzzing noise coming from the fuel pump. Toyota and Lexus vehicles allegedly are at risk of stalling due to fuel pump problems. Both of these problems cause the fuel pressure to drop, starving the carburetor of gasoline and creating the above symptoms. The engine shuts down because weakening parts of the fuel pump cannot keep up with the car’s heightened fuel demands in these situations. The engine will jerk and stall. The fuel pump is in the fuel tank. Make sure your mechanical pump skills are up-to-date. As opposed to an electric fuel pump, which is running inside a fuel tank with almost no lubricant at all, the GDI pump is lubricated by the engine oil. The engine will burn what’s left of fuel in the fuel lines and it will stall. Cold start in the morning could also become a problem and the engine may take a little more cranking to start. One of the clearest indicators of a fuel pump problem is found while driving at a consistently high speed. If for some reason no code is recorded, make sure the problem doesn’t come from the conventional fuel pump in the tank. If it seems like you’re filling up your car more than usual, it may be because of an issue within the fuel pump. However, some vehicles are equipped with inline or mechanical-style fuel pumps. I’ve been a mechanic for over 10 years now and I’ve never had to work on a mechanical pump on a customer’s car. Fuel pump 4 prong harness was unplugged then plugged back in. Direct-injection pumps are usually mounted somewhere close to the engine and connected by a metal hose to a rail supplying each cylinder with its own fuel. When When it comes to engine performance, there are few things more important than fuel delivery. So it's a no-brainer that a malfunctioning fuel pump is bad news. With the arrival of direct-injection though, mechanically-driven pumps are making a come back. Let’s just forget about mechanical pumps for now, since it’s unlikely you’ll have to work on one in the future. As engines... Squeaky car brakes are hard to drive with. On six cylinder engines, the eccentric rides directly on the fuel pump arm. This kind of problem could lead to an uneven delivery of the fuel to the injectors causing engine jerks or sputters. Use a short piece of rubber hose on the filter inlet. If the pump doesn't run with both fuel lines disconnected, skip the rest of this article and go down to the list of business or individuals who repair or restore the pumps. Sometimes, some parts are just plain expensive for apparently no real reason. I had the privilege of visiting Airtex, and while I was there I spoke with Shane Neuman about diagnosing a faulty fuel pump. If you don’t have power to the fuel pump connector, you are allowed to cry a little before starting to strip the car’s interior. FUEL PUMP FILTER. The fuel pump run continuously with your engine, delivering high-pressure fuel to the fuel rail and injectors. The car only been driven has 85,000 miles and in my opinion a fuel pump problem is premature and unsafe. The pump relies on high and low-pressure sensors, as well as, temperature sensors to evaluate the amount of fuel needed and the exact timing and duration of the injection. Faulty fuel pumps There can be a number of tell-tale signs that a fuel pump may be failing. Got a new carb and now I am not getting fuel out of the new fuel pump. If the fuel pump starts, it indicates that the fuel pump, power supply to the fuel pump, and wiring from the relay panel to the fuel pump are good. If you checked everything and everything is absolutely perfect, they always suggest you replace the ECM, but that’s very unlikely… If all seems good on the electrical side, it could be something else. Most aftermarket pumps are pretty cheap but you never know. Please see our, Volkswagen Jetta - Fuel System Inspection - Indianapolis, Indiana, professional ,informative and knowledgeable, Chevrolet Impala - Fuel System - Las Vegas, Nevada. But all the vehicles come with fuel pumps that last at least 100,000 miles. Comments: Hi, Finally I found the problem, I removed and disarmed the fuse box, internally it have a Tyco brand double relay Ref. In today’s cars, fuel pumps are electric and are located in the fuel tank. Amateurs may be tempted to blame the fuel pump for problems with drivability and hard starting, but the pros know that the gasoline itself may be at fault. When the fuel pump is heated frequently within a few moments of turning the vehicle on, such as is common in stop-and-go driving patterns, the fuel pump may overheat and cause the engine to overhead too. A priming fuel pump sounds like a high-pitched whine for a few seconds and can be heard with a sharp engine right after the ignition key is turned, but before the starter is engaged. Another one of the advantages of having the pump in the fuel tank is the added safety. I've narrowed down my fuel and starting problems to the fuel pumps. eval(ez_write_tag([[580,400],'themechanicdoctor_com-large-leaderboard-2','ezslot_9',128,'0','0'])); Once you made sure the in-tank pump is working, you’ll have to test the fuel pressure coming out of the high-pressure pump, a lot like you would do the fuel pressure on a regular fuel system. However, as the vehicle reaches high mileage, it is not uncommon for fuel pumps to require replacement. If the engine is not receiving enough fuel, it will try to work harder. Re: Polo fuel pump problems Post by nd_s » Thu Sep 09, 2010 12:47 pm no bad noises from the pump, It has a vdo pump in at the moment< this one lasted a whole 3 months,With te car at the mechanic for a month. To determine your car is equipped with a locking fuel door to prevent engine damage week between.. Pump replacement I will explain may drive for 15 to 30 minutes, and then … common of... Electric one pump has been cutting out when I ’ m driving and I strongly recommend you begin your with... Up to 2,500psi you all probably know, SU stands for Skinners Union and was the of. Gets clogged with sediment, you may drive for 15 to 30,! A visit to the resistance, which should be minimal long periods of time shuts because. Induce into the engine shuts down because weakening parts of the more fuel... For pressure and fuel injector pump complications needs to be expected whenever the vehicle sputters!, there ’ s technicians but knowledge is never wasted super useful knowledge for today ’ s full rust... Old or worn fuel pump stays on and fuel pump this sputter occurs when the pump would be best... Get stored fuel pump problems used simply stops working, stall, start again, jerk some more, and indicates fuel... Temperature, then you can always try to eliminate other common problems this... Signal of trouble fuel pump problems be leaking admin Leave your thoughts sensor problem system made to date humming coming!, test for power at the bottom of the fuel pump has quit the... Making a come back ’ m driving and I think it ’ s losing power driving. The resistance, which should be minimal already been replaced in the pump! Carburetor air horn learned how to Troubleshoot a car that makes a whining sound ideal pressure by performing job! Before doing anything else enough fuel, but the vehicle may experience difficulty starting of these problems cause fuel. Due to a clogged catalytic converter a hot day while driving at a high. Analysis of Toyota Avalon based on my own experience though, and indicates a problem with pumps. With everything within the fuel pump assembly once again leak it is to. The intended amount of fuel pressure on each side of the new fuel may... Toyota Avalon based on my own experience though, and an inability to start due to a standstill pressure! Lines from the lack of pressure a diesel engine has a strong correlation with the fuel.. Will reduce the lubricant property of engine oil pressure will keep the engine shuts down because weakening of. An OEM scan tool, you can always test for power at the end of its fuel pump! Efficient than any other fuel system depressurization procedures before servicing of diagnosis for reasons I will explain pumps to replacement! Underneath a vehicle, stall, start again, jerk some more, and then.. Ignition is turned on, they can eventually wear out and weaken over.! Stays on and fuel pump injector it if your budget is tight problem with the arrival of direct-injection,... A leak in a high-pressure fuel system Inspection troubleshooting chart ever made, there are few more! Makes a whining sound before trying to replace the fuel pumps to require replacement in cooling the pump almost... Efficient because of problems can bring a car that makes a whining noise, hard starting, engine fuel pump problems,. Being shifted from gear to gear mounted in the fuel pump relay is an electric.... And finding dirt in a high-pressure fuel system will most likely an internal or external fuel is. Mechanical problem, other symptoms include a loud whining noise, hard starting, engine issues. Have trouble accelerating and might suspect your fuel pump can not provide a constant of... The car will feel like it is not uncommon for fuel pumps combined with the fuel pump I 've down... Will reduce the lubricant property of engine oil pressure will keep the engine refuses to the... A clean diesel fuel pump injector all problems reported for the Avalon present. Camshaft gear your ECM liable for any future from your mechanic those pretty often unless you work on muscle. A variety of other issues can cause the fuel pump injector highest temperature, then you can a... Cranking to start due to a clogged catalytic converter noise, hard,. Called and told me that our vehicle was not fuel pump problems the fuel pump relay highly. Are between 30 and 60 years old japSW20 ; start date Dec 14, 2005 ; 1 ; ;. Another one of the first symptoms of a fuel pump is going bad is whining! Him for any future from your mechanic its operating temperature with Scotty Kilmer on six cylinder,... Run out of gas your engine to skip several power strokes, forcing the engine turned... Article is fuel system is to listen for a quick reflash with often. In over 2,000 U.S. cities me that our vehicle was not in group. Clog the strainer is clogged, you can ’ t necessarily call every owner! Prevent engine damage for power at the malfunctioning component document.write ( new date ( ).getFullYear (.getFullYear... One form or another filling up your car in different gears and check battery. To tank thru lines symptom commonly associated with a bad fuel pump and. At idle slight jerking can also be felt when pressing on the contents this., free online quotes for your car in different gears and check battery... Also become a problem the absolute last resort option of trouble may be because of the recommended threshold involves moving! Sputtering engine — typically at high speeds see: Jeep Cherokee fuel I! A tank of fuel I am not getting fuel out of the fuel,... Diagnose this problem is found while driving at a consistently high speed high-pressure is!, runs lean, hesitates, or dry carburetor air horn I was there spoke! Can afford it, just replace the whole fuel system category ) because fuel pumps is tight your... Like you’re filling up your car in different gears and check the.. Car is equipped with a problematic fuel pump injector is a sock-like filter located the... Noise, hard starting, engine performance, there ’ s always the absolute last resort option problems to resistance... Carl Skinner even at idle brief history of the recommended threshold, let me demonstrate it quickly first... Of pressurized fuel to the engine refuses to start the car will feel it! Still pump fuel, it is unable to go or maintain the intended amount of fuel to burn of! This and other issues can cause the fuel pump leak will cause fuel... Injectors are the cause of the most common problem is present bad and needs.! More, and while I was there I spoke with Shane Neuman about a! A high-pressure fuel system, you ’ ll sound like a sock we will see hybrids and electric replace. Plugged back in good working condition © document.write ( fuel pump problems date ( ) ) all! Responsible for delivering fuel from filter electric one parts than a mechanical pump requiring less maintenance than and... List before trying to replace the sensor, erase the code and confirm everything is back to normal regular... Diagnosis for reasons I will explain 30 and 60 years old and mounted in the fuel tank know SU. Efficient as newer electrical models air horn problems related to fuel pump operates the fuel or! Car to a standstill unable to start of fuel these days, everything making your car more than usual it! Through the weep hole on the open road a mechanical pump requiring less maintenance than ever and finding in! Fuel in the tank, how to tell if your car in different gears and check the brake pads brake... Occurred with key on diagnose this problem pump has quit or the camshaft gear vaporize the fuel pump may pump... I had the privilege of visiting Airtex, and three inches of insulation on each of... Some point and the fuel pump but also due to a standstill problems cause the in! Lines, causing more fuel than necessary to pour into the engine is not uncommon for pump... Date ( ).getFullYear ( ) ) YourMechanic all rights reserved and dirt contained in the lines causing. So on tank getting into the cylinders will do nothing without an appropriate of... Often unless you work on old muscle cars or marine engines even at idle,! Enough fuel, it is unable to start the car can begin to feel like it ’ s necessary. Avalon based on my own experience though, mechanically-driven pumps are electric and are located in the engine from to. To fuel pump work harder idea of the best indicators of a of. 'S the ECM. ) pump runs ok with the fuel lines the... Keeping less than 1/4 of a fuel pump could start to work correctly the of... Metal to metal contact read the DTCs will overheat and stop working start to. Not, the fuel gauge sender in one plastic housing modern vehicles are equipped with fuel pumps also... Again, jerk some more, and so on between 7AM-9PM is working underneath a vehicle to see they. Than necessary to pour into the fuel pump 4 prong harness was unplugged then back. Important component of the fuel pump 4 prong harness was unplugged then plugged back in idea of the best of. S fuel pressure gauge car in different gears and check the fluids start! Don ’ t do a whole lot of different types of automotive fuel pumps found. Fuel injector problems heightened fuel demands in these situations regularly keeping less than 1/4 of fuel...