vapor leak
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,629
Best guess, crack on the fuel pump fitting.
Its a known problem, GM did have a recall of the problem to fix it when found, but that recall has timed out to be done for free now.
Short of that, could be a O ring leak in the cross over tube, or a hand full of other problems. So bets bet is to have a smoke test down on the fuel system, to find out where the leak is coming from to start with, then you figure out if you want to do the repairs, or have someone else do them instead. Hence dropping and reinstalling the tanks to replace the fuel pump, no walk in the park.
Its a known problem, GM did have a recall of the problem to fix it when found, but that recall has timed out to be done for free now.
Short of that, could be a O ring leak in the cross over tube, or a hand full of other problems. So bets bet is to have a smoke test down on the fuel system, to find out where the leak is coming from to start with, then you figure out if you want to do the repairs, or have someone else do them instead. Hence dropping and reinstalling the tanks to replace the fuel pump, no walk in the park.
Thread Starter
Navigator
Joined: Aug 2021
Posts: 9
Likes: 0
Best guess, crack on the fuel pump fitting.
Its a known problem, GM did have a recall of the problem to fix it when found, but that recall has timed out to be done for free now.
Short of that, could be a O ring leak in the cross over tube, or a hand full of other problems. So bets bet is to have a smoke test down on the fuel system, to find out where the leak is coming from to start with, then you figure out if you want to do the repairs, or have someone else do them instead. Hence dropping and reinstalling the tanks to replace the fuel pump, no walk in the park.
Its a known problem, GM did have a recall of the problem to fix it when found, but that recall has timed out to be done for free now.
Short of that, could be a O ring leak in the cross over tube, or a hand full of other problems. So bets bet is to have a smoke test down on the fuel system, to find out where the leak is coming from to start with, then you figure out if you want to do the repairs, or have someone else do them instead. Hence dropping and reinstalling the tanks to replace the fuel pump, no walk in the park.
Melting Slicks
Joined: Jul 2015
Posts: 2,290
Likes: 231
From: Round Rock Texas
Last edited by sirdano; Oct 28, 2025 at 04:54 PM.
Safety Car
Joined: May 2016
Posts: 4,647
Likes: 1,832
From: Erlanger, Kentucky
1. Cracked drivers side fuel pump fitting on top of pump. Several hundred $ to fix and a lot of work.
2. The other is your EVAP purge solenoid has gone bad. Easy fix. $20 part and about 20 minutes of your time.
I would try changing out the EVAP solenoid and see if you still have the gas smell. If not, then it's fixed. If still has gas smell, likely need to change out the drivers side fuel pump.
Melting Slicks
Joined: Jul 2015
Posts: 2,290
Likes: 231
From: Round Rock Texas
Two possibilities.
1. Cracked drivers side fuel pump fitting on top of pump. Several hundred $ to fix and a lot of work.
2. The other is your EVAP purge solenoid has gone bad. Easy fix. $20 part and about 20 minutes of your time.
I would try changing out the EVAP solenoid and see if you still have the gas smell. If not, then it's fixed. If still has gas smell, likely need to change out the drivers side fuel pump.
1. Cracked drivers side fuel pump fitting on top of pump. Several hundred $ to fix and a lot of work.
2. The other is your EVAP purge solenoid has gone bad. Easy fix. $20 part and about 20 minutes of your time.
I would try changing out the EVAP solenoid and see if you still have the gas smell. If not, then it's fixed. If still has gas smell, likely need to change out the drivers side fuel pump.
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Drifting
Joined: Jul 2011
Posts: 1,821
Likes: 442
From: Boca Raton Florida
If it was EVAP solenoid, it would throw P0455 trouble code usually. However that is not 100 percent of the time, if it does not detect a very large leak, it might not. Mine is bad, I will change it at next oil change when the car is up, once in a while I get that code, clear it and it stays away for a long time. It is at the back driver side behind the axle/ exhaust.
Advanced
Joined: May 2025
Posts: 50
Likes: 3
From: Dayton Ohio
If it was EVAP solenoid, it would throw P0455 trouble code usually. However that is not 100 percent of the time, if it does not detect a very large leak, it might not. Mine is bad, I will change it at next oil change when the car is up, once in a while I get that code, clear it and it stays away for a long time. It is at the back driver side behind the axle/ exhaust.
Is the Doorman the one to get as a replacement?
Safety Car
Joined: May 2016
Posts: 4,647
Likes: 1,832
From: Erlanger, Kentucky
With my tune I have all the emissions stuff turned off so it doesnt throw codes. I havent gotten to pull the tank yet (on the list since I am in the process of pulling the subframe right now to rebuild the torque tube) so was going to try this next. I remember reading something that said there is one to buy since it has the harness or something like that, vs the other that you still have to get the harness (not sure of the reason or if it was this, just knew it was for the evap system)
Is the Doorman the one to get as a replacement?
Is the Doorman the one to get as a replacement?
I would definitely change this out first as it is cheap and easy so replace the part.