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#1 |
Registered User
![]() Join Date: Jan 2013
Location: Tomball, Texas
Posts: 9
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FUEL CAP---Help!!
I have a 1972 GMC with the 402bb. I am in need of the correct fuel cap that is vented.....Unless I'm doing something wrong. I bought a couple from LMC but my tank still has a great deal of pressure build up, not good. Does anyone have or know where I can get an NOS cap that is correct?
Thanks, James |
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: FUEL CAP---Help!!
72 the correct from the factory cap is non vented
the problem is probally // the vent line from the gastank that went up into the passenger side door frame then down into the frame and foward to the charcoal canister to carb// guys disconnect and just plug the lines causing a pressurized tank if they had common sence and just left the vent line you would have no problem
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#3 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: FUEL CAP---Help!!
If you are having an ongoing problem it does sound like the vent system itself is having a problem.
As you did not tell us what you actually have, 72 GMC covers a lot of metal and variations we are assuming you have a C1500. Here are the drawings for a 72 chevy which are directly applicable to your truck if it is a C1500. They are found in the factory service manual section 8. If you don't have one they can be downloaded here. http://67-72chevytrucks.com/vboard/s...d.php?t=558016 Remember if you are having a vent problem or smelling fuel it is most likely in the vent system and needs repairs or correction from a hack job improvement.
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