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Fuel Tank Builds Pressure after 5 or 10 miles

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Old 04-02-2013 | 03:30 PM
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Default Fuel Tank Builds Pressure after 5 or 10 miles

I have a co-worker that has a 2001 Chevy Silverado 4.8 engine. The gas tank builds pressure after driving 5 or 10 miles or less?
He has changed the fuel pump, filter, three gas caps, e-vap canister, and cleaned the fuel line from the canister to the tank. When removing the gas cap it release a lot of air?
He also has talked with a mechanic and our county fleet guy. Any ideas whats happening here?
Old 04-02-2013 | 04:01 PM
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It should have a code set for a valve fault or EVAP fault.

I would check the purge valve.
Old 04-02-2013 | 07:34 PM
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Thanks, We will check it out.
Old 04-04-2013 | 01:55 PM
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Thanks, We got Codes

P040 - EVAP system
Code - P0452 - Tank Pressure Senor.
Old 04-05-2013 | 01:28 AM
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That's the sensor mounted on the top rear of the tank, I think. If it's buggered the engine will never attempt to pull vacuum on the tank.
Old 04-05-2013 | 12:46 PM
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GM Has a retro fit for the EVAP Purge solenoid, its relocates it forward and higher out of the way of junk. With a good scan tool you can manually open and close purge valve. I would start with that, bet its stuck closes.

Usually purge vlave is located at rear of tank of side, but thye like to move them around
Old 04-05-2013 | 12:46 PM
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Old 04-05-2013 | 04:43 PM
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Thanks, I'll post back what we find.
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