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fuel system

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How to Troubleshoot a Gas Cap Cover That Won't Open
Gas cap covers, or fuel doors, get stuck closed and won't open if there's a faulty internal spring or lever, lack of lubrication, or bent fuel door.
How Long Does a Fuel Pressure Regulator Last?
In order for the fuel system in a car to operate properly, it will need to have the right amount of pressure. The injectors that are mounted in each cylinder of...
Symptoms of a Bad or Failing Fuel Filter (Auxiliary)
If your car is hard to start, developing engine performance issues, or has the Check Engine Light on, consider replacing the auxiliary fuel filter.
How Far Can You Drive Your Vehicle on Empty?
Knowing how many miles you can drive on an empty gas tank prevents getting stranded. Nissan Altimas can go the farthest when the low fuel light is on.
How to Know What Type of Gas to Use
Your vehicle is propelled by a combustion engine. That means that fuel is injected into the engine’s cylinders in some fashion, where it combusts, or burns, to...
How to Replace a Fuel Filler Cap
A good fuel filler cap safely seals the fuel tank. Signs of a failing fuel cap include the smell of gas, stripped threads, or a cracked cap.
How to Tune and Adjust Your Carburetor
While all modern cars use computer-controlled fuel distribution systems, there are still many vehicles on the road that employ the traditional carbureted method of fuel delivery. Before electronically controlled fuel systems were developed,...
How to Figure Out Which Type of Fuel Gets the Best Mileage
We all want our car to go longer on a single tank of gas. While all vehicles come with a mileage or mpg ranking, mileage can actually vary...
How to Use a Fuel Injection Cleaning Kit
Dirty fuel injectors are a common problem for many vehicles in this day in age. With the exception of direct injected and carbureted vehicles, the vast majority of cars on...
How to Replace a Fuel Gauge Sender
The fuel gauge has a sender that goes bad when it says that the fuel level is different lower or higher than it actually is.
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
How to Replace a Fuel Rail Sensor
The fuel system has a fuel rail sensor which fails when the engine operates erratically, has difficulty starting, or the Check Engine Light comes on.
How to Replace a Fuel Pump Shut Off Switch
The fuel pump shut off switch may be faulty when the Check Engine Light comes on or if the engine suddenly turns off while driving.
How to Clean a Throttle Body
A throttle body needs cleaning when the engine idle is rough, the engine stumbles through acceleration, or the Check Engine Light comes on.
How to Flush a Fuel Injector
Clean fuel injectors help keep your engine running smoothly and efficiently. Clogged fuel injectors result in reduced fuel economy and loss of power.
How to Replace a Fuel Pump Relay
The fuel pump has a relay that fails when there is no audible humming sound as the ignition is turned and when the car cranks after longer than usual.
How to Replace a Fuel Meter Assembly
The fuel gauge assembly indicates your fuel level. The fuel gauge will no longer work if there is an application of reverse charge or corrosion.
How to Replace Fuel Injection Lines
Fuel injection lines transfer fuel from the fuel tank to the car engine. Now made of plastic, fuel lines don't rust and hold up to 750 psi.
How to Replace a Carburetor on Most Cars
A carburetor replacement involves the air cleaner, vacuum hose, car fuel line, and a number of other parts. This complex procedure varies by vehicle.
How to Replace Fuel Injector O-Rings
Fuel injector o-rings prevent fuel vapors from entering the car engine. O-rings for fuel injectors hold up to 750 psi and keep fuel from igniting.

Related questions

Question
I broke a fuel injector plug in, how do I replace it?
Hello, thank you for writing in. The type of repair you need to do is going to depend on what side of the clip you broke. If you broke the fuel injector side, you will have to replace the injector...
Question
It has a new fuel pump regulator and filter but not getting gas to the throttle body
The best thing to do is measure the fuel pressure on the fuel rail (the fuel injectors are plugged into the fuel rail). There should be a port on the fuel rail for this purpose. There is normally pressure on...
Question
My injectors are not pulsing.
Have the power and control circuits for the injectors been tested? If the injectors do have power, but no ground control from the computer to turn them on there may be a fault in the circuit or the electronic control...
Question
Car misfires then goes to limp mode.
When the vehicle goes into limp mode when the engine misfires, the computer is shutting down the electronics to the transmission to prevent damage to the catalytic converter as the fuel condition is either too lean or too rich. Check...
Question
Turns over but will not start and has a strong odor of gas.
Check the location of where the fuel smell is emitting from on your vehicle. If the fuel smell is coming from the fuel tank area, then the fuel pump, fuel line, fuel filter, fuel fuller neck, charcoal canister, or the...
Question
Drove fine, then no acceleration and now no idle. Would start but would die if given gas 1991 Ford Explorer
Hello - I would check for a bad fuel pump relay . (If the fuel pump fuse was blown, it wouldn't run at all) A fuel pump relay with burned contacts would pass a small amount of current, but probably...
Question
My truck seems like it loses fuel or has lack of fuel well I drive I have to pump on the gas to keep it going it doesn't die thoug
Hello, thank you for writing in. If you feel the engine has a lack of fuel, trust your gut and start there. This means you need to test the fuel pressure available to the engine, which in turn will test...
Question
I need to replace a 45 gallon aftermarket gas tank with a used on 26 gallon tank. What's your estimated cost to do this? 2002 Chevrolet Silverado 2500HD
Hello - unfortunately, this is not a task YourMechanic can offer at this point. Check with a local 4x4 or off-road shop, who will be more capable for a modification such as this. Thanks for thinking of us though!
Question
Hi I had my 2006 Town and Country van in my yard running and it was on a slight incline with the front of van going downwards.
Hi there. Try turning on the ignition for 30 seconds and shutting it off 3 times in a row. Then try starting the engine. If the engine wants to start up, keep cranking until the engine is running, but do...
Question
F150 ecoboost poor gas mileage
You should not see the engine oil get higher unless you have excessive fuel getting into the engine from a leaking injection system like a leaking injector. You should have the fuel pressure monitored when the key is cycled on...
Question
My car cuts off without any warning signs and it was hard for me to turn the steering wheel. It was smoking a little under the hood.
Hi there. The issue may be that when the vehicle was filled up, there may have been trash in the gas tank and it may have been stirred up into the fuel system which may have clogged up the fuel...
Question
My Lincoln ls 2004 has 9 codes at onece
Hi there. Your vehicle is in a lean mixture state. The fuel system is not supplying enough fuel to the engine. Check the fuel pump to see if its working by putting on a fuel pressure hose on the fuel...
Question
98 Nissan quest jerks, skips, and rpm's bounce, when it warms up.
Hi there. The symptoms sound like the fuel pump relay is getting hot and cutting off the fuel pump. Check the fuel pump relay and see if its getting hot. If the relay is getting hot, then the fuel may...
Question
I changed the fuel pump in my car thinking that it was the problem, but I'm still not getting power to my fuel pump.
If there is access to a wiring diagram, you can disconnect the fuel pump harness and install a test light in between the power and ground circuits and turn the key to accessory or try to start the vehicle and...
Question
I have a 2007 dodge charger v6 3.5L engine NAG1 RWD Transmission. I'm confused in what is causing limp mode in my car..when the c
The code P0420 will cause the computer to put the transmission in limp mode to protect the catalytic converter. Check the following areas to see the cause for the P0420 code condition: P0420 A damaged or failed oxygen sensor...
Question
I had O2 sensor replaced twice in 4 months, but the engine light came on again 2011 Audi A6.
Hi there. If the check engine light is still on for the oxygen sensors, look at the description of the code to see if the sensor relates to a lean or rich condition. If the code does not, then there...
Question
I am having trouble starting my car
Hello, thank you for writing in. If you know that there is not fuel going to the engine, the new pump must be tested first. To make sure the pump is working, turn the key to the "On" position and...
Question
Loud metallic clunk and stops cranking when trying to start after removing and reinstalling upper intake manifold,
Hi there. Check the fuel injectors and make sure that they are hooked up properly. A leaking fuel injector will cause fuel to flood the cylinder and hydro lock the piston making the engine stop cranking. Also, check for anything...
Question
How do you disassemble the dash of a 2006 gti to replace fuel pump relay
Hi there. It would be best for you to purchase a service and repair manual for your 2006 Volkswagen GTI; as it will give you step-by-step instructions for accessing the fuel pump relay and removing it correctly.
Question
Where is the fuel filter located on my 2011 Volvo c30
Hello, thank you for writing in. The fuel filter is located on the driver's (left) side of the vehicle. It will be inline, so finding a fuel line and tracing it should help you locate the cylindrical filter. It will...

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