Question about Buick LeSabre

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Strong fuel odor coming from left front fender by air filter ,also a lot of pressure build up in tank when you remove cap kmkaren56.@bellsouth.net

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If the check engine light is on, take the car to an autoparts store and have them use a scan tool to retrieve any fault codes stored in the computer. Most autopart stores offer this service at no charge. There could be a problem with the evaportative emission control system. There is a charcoal cannister that stores gas vapors and when conditions are right, a purge valve opens and the vapors are used in the combustion process. The cannister can get full of vapors and if the valve/solenoid is bad, it cannot purge itself of the vapors. Also integral to the system is the gas cap. A faulty gas cap can cause problems within this system. I am not saying that the evap system is the cause, but the pressure build up in the tank makes me suspicious. Get the codes read and it will help narrow things down for you. Sure hope this helped and best wishes.

Posted on Jul 23, 2009

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Try replaceing the fuel filter and check the fuel line to see if there is gas on the engine filter is under the frame drivers side and the plastic clips mave have broken off and may be leaking gas. This is dangrous...

Posted on Jul 23, 2009

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It sounds like you have a malfunction in your evap system (evaporative emissions controls) cracked broken or missing vapor hoses can cause vacuum leaks, and fuel odors. You would need a vacuum pump, a good scan tool to diagnose the evap system. You did not state what year of the vehicle. There are other reasons that can cause this if there is a check engine light on you can get the codes free from autozone then repost with year make and engine size with code numbers so we can better help you.

Posted on Jul 23, 2009

  • carl Jul 25, 2009

    I agree with avid and canbruce, the pressure makes a person believe it is the evap but checking for a gas leak is very important and dangerous I did not get to finish since I was in a hurry. I will vote for avid and canbruce very good advice my friends.

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Code P0452. plus when removing new gas cap there's a lot of pressure in tank


this is an emission system malfunction code. youll need to replace the fuel tank pressure sensor depending on the vehicle it can be located on the fuel purge line coming off the fuel module on the top of the fuel tank or in the top of the tank itself. this could be why theres pressure building up in your tank. try this and it should correct the issue youre having.

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I have a 2005 chevy malibu maxx v6. car runs great, no hesitation or stalling, however a intensly strong odor of gasoline suddenly began about 3 wks ago, and is gettin stronger by the day! it Can be...


No service engine light? A loose gas cap will set a light.
You may want to inspect your fuel filler neck and anything close. For a long while its not uncommon for a person to report the fuel odor issue and have it be where some low life cut a filler neck or puntured a tank to steal fuel. But if that were the case there would usually be a service engine or gas cap light as the systems now days monitor pressures so they can detect leaks in the Evap system.

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Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they get loud or stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?
Also, do you smell a strong fuel odor when it won't start? May be one or more stuck-open injectors, or the coil pack is bad.
Checking these in the order listed will more than likely fix your problem.
The clicking noise indicates the battery can no longer run the starter, which also means the fuel pump won't run either.

It could be a fuel issue. How old is the fuel filter? Can you hear the pump run for a few seconds when you turn the key on? Try turning the key to ON without trying to start engine three times waiting for the pump to stop running each time. Then try to start the engine. If it starts, Its a form of Vapor lock caused by the extreme heat we have had lately, and a weak fuel pump.

If none of this works, try a new fuel filter first. From there have someone check the fuel pressure regulator and then the pump. If you are in need of a new pump, take my word for it and spend the money to get one from a Dealer, and not from your favorite parts store. Most parts store parts are made in China and they are JUNK.

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The tank breather is blocked.
The tank needs outside air to enter as the fuel is pumped out, if this is not happening, the tank is pulled into negative pressure and this will prevent the fuel from being drawn at the correct rate.
The tank vent is a pipe from the tank which is then usually attached to the chassis and nothing else. It may have some form of vapour lock on the end to prevent gas fumes from escaping and forming a fire risk. This is the pipe that is blocked or the vapour lock is blocked. Locate it and remove it to clean it but DONT leave the vapour lock off the pipe when you refit it..
Some fuel tanks are vented through the fuel cap and don't have this pipe so check and make sure that the correct cap is fitted. You can also drill a very small hole through the top of the cap which may allow air to enter the tank although this is not advisable as there would be no vapour lock.

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Lots of possibilities.

Could have corrosion build up and rust clogging fuel tank pick up. Usually reverse air pressure helps, but would help to remove tank sending unit to see if you can **** out any water or gunk.

Could have vacuum building up in tank. Make sure charcoal canister purge valve is working right, and no hiss when taking off gas cap.

Could be fuel pump. Check pressure and volume, leakage, etc.

Could be filter. If carb, remember there is a small filter in the carb as well.

If fuel injected, may have bad pressure regulator or safety valve in line.
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Yeah that is what it seems like thats why you have to turn your key on so many times to prime your fuel pump. Its not holding pressure in the line while truck is not running.

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Where is the fuel filter located on a 2002 Lincoln LS, V8 and how do you reduce the pressure on the fuel line in order to safely remove and replace fuel filter.


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