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Username Post: Gas cap vented or closed system        (Topic#347047)
"10th Year" Silver Supporting Member
Posts: 101
Loc: Minnesota
Reg: 08-24-04
09-08-17 11:19 AM - Post#2707048    

On my '66 El Camino is the gas tank vented?
I'm unable to find a vented gas cap. After a 20-30 mile cruise I open the gas cap and there is a loud hissing and it sounds like someone is banging the gas tank.
Any advise? Thanks

'66 El Camino
'16 Vette coupe
'66 HD Sprint
'67 Honda Scrambler

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Posts: 942

Loc: Lake George, NY
Reg: 11-11-15
09-08-17 02:57 PM - Post#2707068    
    In response to cares

If you have no seperate vent off the tank, the cap must be vented.

Posts: 401
Loc: New Braunfels,TX
Reg: 08-16-05
09-29-17 12:35 PM - Post#2709225    
    In response to Shepherd

I had to read your post twice as I thought that I had written it AGAIN. Two years ago, I bought a '68 el Camino with the same unvented gas cap problem. After blowing the membrane in the fuel pump and injecting gasoline into the crankcase, the fuel pump had to be replaced. I solved the "whooshing" problem by drilling 2 small holes in the gas cap to create a vented cap. No problems with pressure build up now. My garage does smell slightly of gas vapors; however, a '55 Chevy in the garage would produce the same aroma. My garage smells like a garage.

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