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#1 |
Registered User
Join Date: Sep 2011
Location: Jacksonville, FL
Posts: 150
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high pressure buildup in fuel tank - help!
I have an '84 C10 that builds up a lot of pressure in the fuel tank. If I fill the tank up and drive it until the tank is almost empty, when i remove the gas cap there is a lot of built up pressure. I know it is pressure and not vacuum because if I loosen the cap quickly, it will literally blow the cap off the fuel neck.
In case it's relevant, this truck was a dual tank setup. The original owner bypassed the secondary tank and selector valve and ran just hoses straight to the driver side tank. I am running a 350 with a 4 barrel, engine driven fuel pump w/ return line to tank. Anybody have any idea why my tank would be building up pressure? Thanks in advance -Steve
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Shawty: '84 C10 Silverado SWB, 700r4, SBC 350 - 4 bolt main, bored 60 over w/ Weiand aluminum intake and moderate cam, 2" true dual exhaust, Thrush mufflers, 3.42:1 gears -- Build Thread The Tranny (wrecked ![]() |
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