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#1 |
Registered User
Join Date: May 2000
Location: Victoria, BC, Canada
Posts: 2,410
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Pressure in gas tank
I seem to be building up lots of pressure in the gas tank now that some warmer weather is showing up. WHOOOOOSH! when I pull the cap off. I've been asking around about vented gas caps for these trucks but no one seems to carry or even heard of them. I think someone mentioned drilling a tiny hole in their cap, so pressure would be regulated a bit at a time. Any problems with that?
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1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first. |
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#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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You tried just getting one for a 70 truck? I did that a few years ago and they gave me the right one...probably auto zone, I know it was at a large parts store chain, a smooth chrome stock looking cap, never had any problems with pressure build up with it.
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#3 |
Registered User
Join Date: Jan 2001
Location: skamokawa, WA, USA
Posts: 527
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The Napa "california" truck cap has a pressure relief at 3psi. They've got a check valve that lets air in no problem too. The regular caps have a one way check valve, lets air in but builds huge pressure like you're talkin about. I got tired of smellin gas in the cab when I had one. So much pressure would build the tank would actually start springing out. The california cap cured that.
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#4 |
My other Love
Join Date: Aug 2001
Location: Castlegar B.C. Canada
Posts: 4,085
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my tank would puff up so bad on th 74 that it would force gas out of every crevace, I got a vented cap from Lordco from my 69, there should be a Lordco in Victoria i would assume, they will have the right cap
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![]() Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life |
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