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Username Post: gas cap--vent or not to vent        (Topic#311744)
Frequent Contributor
Posts: 2208
Loc: DeSoto, Illinois. 62924
Reg: 01-21-01
05-19-14 04:40 PM - Post#2454309    

Drove the sedan delivery a little today--pulled the gas cap of to a lot of woosh---thought the cap was supposed to be vented--PO had a small hole drilled in top but I guess it wasn't working---supposed to have resealed original tank(with baffles), on a carburated engine with electric fuel pump--no return lines. do you think vent tube is stopped up--need to find it I guess or just the wrong cap. Have a locking one that is supposed to be correct---it on for now---should I just go ahead and try to find the original one or stick a rag in it. Thanks


Ultra Senior Member
Posts: 12100

Loc: Wisconsin..USA
Reg: 09-27-02
05-19-14 06:43 PM - Post#2454340    
    In response to REBORN55

All Chevrolet gas caps, 1960 and prior, were vented. Throw the cap away and buy a new one.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible

Frequent Contributor
Posts: 2208
Loc: DeSoto, Illinois. 62924
Reg: 01-21-01
05-19-14 07:30 PM - Post#2454362    
    In response to Gene_Schneider

That's what I thought --THANKS


Posts: 48

Loc: Oregon
Reg: 09-19-04
05-31-17 10:02 PM - Post#2693789    
    In response to REBORN55

Why is it a problem if you don't use a pressure relief, or vented cap? Heat expands the gas, pressurizes tank. Then it cools and retracts. Cycle this a bunch of times and imagine what it does to the metal. If you want to simulated it, try a bending a paperclip back and forth a bunch of times until it work hardens and breaks.

1946 Chevrolet Fleetamster Town Sedan

2nd Year Silver Supporting Member
Posts: 228
Loc: Bloomingdale, IL
Reg: 08-12-13
06-01-17 07:02 AM - Post#2693831    
    In response to REBORN55

I have a "Tanks" "plastic" tank in my '46 and it has a vent port on the top of the tank. I ran a length of rubber tubing from there along the filler tube to just below where the filler tube goes through the fender.

1946 Chevy Fleetmaster 4-door Street Rod

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