excessive gas tank pressure
Thread Starter
Heel & Toe
Joined: Nov 2000
Posts: 24
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From: conifer co
excessive gas tank pressure
When removing the cap from my '98 C-5 gasoline tank there seems to be a rather large amount of pressure. If the tank is near full, gasoline will actually spray from the tank. Any body had similar problems? If so, what is the problem?
Pro
Joined: Sep 2000
Posts: 736
Likes: 0
From: Breese Illinois
Re: excessive gas tank pressure (DAG)
DAG,
Our cars have a fuel tank vent valve on them. If you're tank is pressurizing I would suspect that either the valve is bad or the line going to the valve is plugged.
later,
Our cars have a fuel tank vent valve on them. If you're tank is pressurizing I would suspect that either the valve is bad or the line going to the valve is plugged.
later,
Race Director
Joined: Sep 1999
Posts: 12,438
Likes: 919
From: CONCORD NC
Re: excessive gas tank pressure (THRAP 42)
(1) EVAP Canister Purge Solenoid
(2) EVAP Canister
(3) Fuel Fill Neck/Fill Cap
(4) Rollover Valve/Fuel Tank Pressure (FTP) Sensor
(5) Fuel Tank
(6) EVAP Canister Vent Solenoid
(7) Vent Hose/Pipe
(8) EVAP Vapor Pipe
(9) EVAP Purge Pipe
(10) EVAP Service Port
I didn't realize this is built into the EVAP system. It is in the passenger rear fender. Take out the rear fender liner, then the cover in the front of the passenger area, just under and behind the fuel tank. You should be able to access the EVAP canister, and check to see if the line is clogged.
Dave
(2) EVAP Canister
(3) Fuel Fill Neck/Fill Cap
(4) Rollover Valve/Fuel Tank Pressure (FTP) Sensor
(5) Fuel Tank
(6) EVAP Canister Vent Solenoid
(7) Vent Hose/Pipe
(8) EVAP Vapor Pipe
(9) EVAP Purge Pipe
(10) EVAP Service Port
I didn't realize this is built into the EVAP system. It is in the passenger rear fender. Take out the rear fender liner, then the cover in the front of the passenger area, just under and behind the fuel tank. You should be able to access the EVAP canister, and check to see if the line is clogged.
Dave
Thread Starter
Heel & Toe
Joined: Nov 2000
Posts: 24
Likes: 0
From: conifer co
Re: excessive gas tank pressure (davidfarmer)
Thanks to everyone who has replied
Yesterday after a several hour drive on a hot day at high altitude (Colorado), I removed the gas cap with the engine running (elevation 8000'). To my surprise, not only was there excessive pressure but it was also very warm almost hot! Rather than a quick escape of pressure, the pressure/fumes continued to escape for at least several minutes. I'm not sure how long this would have continued if I left the engine running.
Yesterday after a several hour drive on a hot day at high altitude (Colorado), I removed the gas cap with the engine running (elevation 8000'). To my surprise, not only was there excessive pressure but it was also very warm almost hot! Rather than a quick escape of pressure, the pressure/fumes continued to escape for at least several minutes. I'm not sure how long this would have continued if I left the engine running.
