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Re: Fuel smell on start-up, 94 Grand Prix
Remove the vacuum hose from the fuel pressure regulator and have some one turn the key on if it leaks gas out its bad this will explain the smell. Also does it have a hard time starting when it sits for awhile ?
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First check for fuel leaks. Be safe. Next I would pull the spark plugs and smell them for gas. If you smell gas on them, they are fouled out. Start with replacing them. Also check for spark. These are the two basics to check first. Spark and fuel. You have fuel because you can smell it.
replace your fuel filter and buy Z MAX (only thing i trust) fuel and engine system restore ( about 35 bucks at any auto store but so worth it). what has happend is the fuel in the tank is dirty or carmalized, basically the car had been sitting for a while and the fuel seperated in your tank. normal conventional gas is not strong enough to break down deposits. and when you replace your fuel pump, make sure the whole wiring harness or the actuall fuel pump harness is replace. other wise you keep blowing your fuel pump and/ or keep backfiring
You may have a bad fuel injector or in need of a tune up badly. The early fuel injection (throttle body) had a single fuel injector that would clog and not spray fuel in a mist but would dump fuel. Does it run rough at idle? That is a good indicator. Some are rebuildable but I would suggest replacement. If you have not had a tune up in a while that should be done too.
It may be the fuel pressure regulator located on the fuel rail on top of the motor it leaches out a very small amount of gas when they start to go inspect it if it looks even a little bit wet replace it, if this is not wet then the gas cap may not be venting properly replace it.
I have a 2002 Impala, and on cold days on the first start of the day had strong fuel smell. I troubleshot the problem to the fuel pressure regulator on the fuel rail was leaking around the seams. I replaced the regulator and have had no problems since. Hope this helps. Chad
One suggestion I can make to see if your car is getting spark is by purchasing an in-line spark tester from an auto parts store (not very expensive) and pulling each spark plug wire off and checking with the tester.
If you are getting spark to every wire and they all seem to be the same brightness, try replacing your spark plugs with the recommended plugs and setting the gap with a spark plug gapper.
To see if you are getting fuel to each cylinder, try to start the car a few times with the fuel pedal to the floor (for fuel injected engines) to clear a flooded engine and then pull the spark plugs out of the engine and smell them to see if you can smell fuel, if there isn't a strong scent of fuel, you may not be getting fuel and you'd probably need to take your car to a mechanic to have them check the fuel system and injectors.
I hope I could help you get started to narrow down the problem. Good luck and don't forget to rate! Thank you.