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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
My 2010 Mercury Mariner makes a rattling sound when accelerating
The noise you are hearing is most commonly known as pinging or pre-ignition. This can be causes by the mass air flow sensor running the engine lean or if you do not have a flex fuel vehicle then running a...
Question
Fuel gauge is not working.
Hi there. The fuel gauge is not working and needs replaced. First check the wiring to the gauge cluster and see if there is any loose wires or damaged wiring. If all of the wires are good, then you will...
Question
I have a P0193 Fuel Rail Pressure Sensor High Input Code and want to know how to fix this
The code P0193 pinpoint test should be done to verify the pressures and sensor indicate the same. You most likely have a defective sensor for the fuel pressure on the fuel rail. Replace the sensor and clear the codes. If...
Question
My girlfriends 2006 Toyota, 6 cyl, 4WD 4Runner's fuel gauge reads 1/4 tank when actually empty. What could be most likely cause?
Hello, and thank you for writing in. On most newer 4Runners, the fuel pump includes the fuel level as part of the unit commonly referred to as a fuel module. It is likely that the level is not calibrated, dirty,...
Question
Bad gas was put in the van, 3 premium tanks later I'm still having issues with the van stalling.
Depending on what your fuel was contaminated with you may have clogged the fuel filter and may have even clogged the injectors. You should go through one more tank and use some drygas to make sure you got rid of...
Question
Fuel injection engine and I have to hold the gas to the floor in order to start
The vehicle should have the fuel pressure and computer system tested to see if the fuel system is flooding the engine or the computer system has sensors failing like the MAP sensor or throttle position sensor issues. The scanner can...
Question
Ok my car will not start it had the same issue a week ago I changed the cam and crank sensors. It cranks but wont start ...HELP!
Prior to performing diagnostics be sure you have a fully charged battery that passes a load test. Then, confirm that the engine immobilizer system (security system) is not activated thus preventing the car from starting. To temporarily override the immobilizer...
Question
my car wont start
Be sure you added an adequate amount of gasoline to the fuel tank. If the starter motor itself is not functioning (i.e., no engine cranking), then the starter circuit has to be diagnosed. If the starter motor is functioning, but...
Question
Check engine light is on. The gas cap is okay and the vent sensor by crankcase seems okay too. What could it be?
The issue could be the evaporative emission vent purge valve on the vapor charcoal canister. I recommend using a sniffer that is used for butane and check for a fuel leak around the vent purge valve and see if there...
Question
Long cranking
There are many causes of hard starting but illustrative ones are a faulty engine coolant temperature switch (sensor), worn spark plugs, inadequate fuel delivery or pressure (caused by other than fuel filter in your case), and contaminated or old gasoline....
Question
Can you put spark plugs and fuel injectors from a 1998 4.6L Expedition into a 2001 4.6L Expedition? (an auto parts store associate told me I could)
The spark plugs will not make any difference with the engine performance, however, the fuel injectors are different and will cause the computer to not operate the injectors properly. This is why the engine light came on with all of...
Question
My car been leaking gas my tank is on my passenger side but gas leaking on my driver side
Leaking gasoline is a fire/explosion hazard so be sure to have this leak repaired at your earliest convenience. In the meantime, be sure not to park in a confined space, such as a garage, because gasoline vapors could accumulate and...
Question
Keeps throwing main fuel pump circuit code.
Check the fuel pump relay and see if its getting hot. A faulty fuel pump relay will throw a fuel pump circuit code if the relay gets too hot. If there is a code for the camshaft actuator, then there...
Question
Check Engine light comes on and goes off 2005 Volvo S40
Hi there - without knowing whether the fuel pressure problem is "pressure high" or "pressure low", it would be speculating as to what component may be malfunctioning. Get the problem codes turning the Check Engine light on. For the fuel...
Question
Where is the fuel pump shutoff? 2005 Chrysler PT Cruiser
Hi - the (inertia) fuel pump cutoff switch is mounted on the rear face of the right (passenger), rear strut. Mounted against the strut mount tower with 2 bolts.
Question
Hard Start
Illustrative causes of hard starting include a faulty engine coolant temperature switch (sensor), worn spark plugs and/or defective secondary wires and coils, inadequate fuel delivery or pressure (e.g., clogged fuel filter), dirty fuel injectors (fuel injectors cannot be completely cleaned...
Question
What is the name of the hose that is on the top of the fuel filter that it's connected to?
The inline fuel filter has 3 lines all combined in the area. The supply hose is connected to the fuel filter. The return hose is connected to the top of the fuel tank. The vapor return hose is connected to...
Question
Gas tank is leaking
The tank is made of very sturdy stamped steel. It will withstand any conceivable vapor pressure that gasoline will create in a motor vehicle. If the tank is leaking, it leaks because it's rusted out. It's usually a waste of...
Question
The fuel pump relay and fuel pump have been replaced and the engine still doesn't receive fuel. 1995 Honda Accord
Hi there - the first thing to check is the fuses for the fuel pump and engine management computer - be sure they are good. Next step is to determine if you hear the fuel pump running, even if only...

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