humming noise when car is off than smell of gas?

Litlslggr · Dec 11, 2010

Ive searched a lot. I apologize if there is a thread out there.

I will be out in my garage working on my friends cars or cleaning up. Out of no where my car will let off a loud humming noise. And one time it happened and i was working on it. I smelled gas in the back of the engine compartment by the fuel filter. I only smell gas when this noise happens. Could the fuel pump be pumping randomly pumping gas through the system? I was thinking maybe it was shorting out, but I dont want to jump to that conclusion and tear it out if it is something else. Any ideas?:dunno:

Speedemon636 · Dec 12, 2010

Was the ignition on the "on" but not running position? Or completely off?

MyBoostedGST · Dec 12, 2010

If I remember correctly, unlike most cars, 2g's only supply power to the fuel pump when the ignition is turned all the way to the start position.

cAPSlOCK97gst · Dec 12, 2010

Do you have an aftermarket fuel pump? Is it rewired?

The_EE · Dec 12, 2010

That humming is likely coming from the engine bay. Do you still have your charcoal canister hooked up? There is a 1 way check valve, a gray cylinder that releases pressure every so often, I think when it gets too high inside the gas tank. The fumes are usually absorbed by the charcoal in the canister or burned by being introduced into the intake system but in my case, with no canister, it is vented to the atmosphere.

1990TalonFast · Dec 12, 2010

People on this website are extremly helpful.

Litlslggr · Dec 16, 2010

My ignition was completely off with the keys on my work bench. And that was a good idea The EE. I just checked it all and the canister is still there.
And cAPSlOCK97gst.. I have the stock pump which I havent rewired. I was planning to on replacing the pump and injectors this summer so I figured I might as well wait to mess with it.
I am stumped right now. I mean it doesnt seem like its doing harm to my car but seeming is one thing. I need to know for sure before I make an assumption like that.

Speedemon636 · Jan 2, 2011

Did ya figure out what the problem was?

akira235 · Jan 2, 2011

my guess would be that the mpi relay was shorting and turning the fuel pump on

The_EE · Jan 2, 2011

akira235 said:
my guess would be that the mpi relay was shorting and turning the fuel pump on

Doubtful, my car makes the same sound on occasion and I disconnect the battery every time I part the car for the night. Now power means no MPI which means no fuel pump being turned on. Since my car did it with the motor out of the engine bay and the only thing in there was the check valve and it was vibrating when the sound was being made, I am quite positive that is his problem.

I could be wrong.. it has not happened yet but it could

Litlslggr · Jan 4, 2011

I still have not found the problem. But I am still looking. I had a lot of crap go wrong so most my focus went to that and the other projects piling up. Im about to just replace everything I can replace in the fuel system because I figure once I fix this something else will go out. Yay for owning a DSM

lol

humming noise when car is off than smell of gas?

Litlslggr

Speedemon636

MyBoostedGST

cAPSlOCK97gst

The_EE

1990TalonFast

Litlslggr

Speedemon636

akira235

The_EE

Litlslggr

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