Our Community is 940,000 Strong. Join Us.


I smell gas from the fuel pressure valve


phaderus
06-12-2005, 11:36 AM
My car is 1999 Grand Am with 3.4. The plugs and wires have less then 10,000 miles on them, and car is running strong.

My qustion is: does the fuel pressure let out excess gas that was not burnt(bad plug or wire) or excess gas if the pressure because too much becausethe regulatore is broke, or is the pressure valve bad which is on the injector rail?

Their is just so many reasons why I could smell gas when the motor is running. I have no idea of how to elimimante possible problems for example: clogged or bad injector, the pressure valve is actually bad, pressure regulator valve is bad, bad spark plug,bad wire, or a bad coil module. I do think it is important that their are no check engine lights on and a scan retrieved no codes. Any help would be greatly appreciated!

Ridenour
06-12-2005, 04:36 PM
A bad fuel pressure regulator could let our some gas, yes. If you're actually smelling is gas when you're running, it could be the fuel pressure regulator, or it could be running rich in some fashion due to some cause which you have listed.

phaderus
06-12-2005, 08:47 PM
Tomorrow, I am going to buy a gauge to test the fuel pressure. If the pressure is too high I will look at the injectors and most likely replace the fuel pressure regulator. If the pressure is drops too much I will look for a fuel leak.

There were no codes when I took a scanner to it. So I believe the plug, wires, and coil are good. Is their is an easy way to see if the plug wires and coil are working proper. Any suggestion to help streamline the testing process.

Thanks

mobil_12
06-13-2005, 10:20 PM
the pressure regulator could be bad in several ways, it could leak externally, leak fuel into the vacuum hose, or leak internally- letting too much fuel and pressure return to the fuel tank.
if you are smelling raw fuel, look for a leak. these engines are common for the injectors going bad. same deal - they leak internally and externally. they also sick open too long and supply too much fuel to the engine. scan it agian and look at your short and long term fuel trim data. anything within 10% (+/- ) of zero is okay. if it is high, the pcm is trying to compensate for a lack of fuel, if it is low, compensating for too much fuel.
i would say a good place to start is checking for an external leak and checking your fuel pressure.

phaderus
06-14-2005, 10:04 AM
It was a bad o-ring, maybe misalligned; had just replaced the LIM gasket, but I replaced the o-ring. No gas smell anymore.

Thanks for the help!!!

Add your comment to this topic!