Gas Cap/Hot tightly sealed???

[Banky]

Hi all,

I'm almost ready to fire up my 30! Question. How tightly sealed should the gas cap be? Does it need to breath? Mine is pretty loose, so much so that I think it's going to rattle while driving. However I'm sure there will be lots of rattles, Ha Ha. I was thinking about cutting a new rubber or cork circle to fit around the edge. But I don't want pressure to build up and blow something out. Had that happen to me with a new plastic gas tank on a 54 chevy once. I didn't have the proper vented cap one, was lots of fun!

Any thoughts from the pros?

thanks,
Banky

[peters180a/170b]

get a new vented cap.

[Glenn C.]

Gas tank has got to breathe. If it dosen't, your fuel will cease to flow.

[Jerry Parr WI]

The cap needs to be vented but not by being loose. Loose cap will allow gas to slosh out.

[FL&WVMIKE]

Banky .......................
If your gas cap is not vented, it is, probably, a radiator cap. They are not vented. The radiator needs to be sealed tight, at the top. It has an overflow.
MIKE

[bobpo]

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I didn't have a "proper" Gas Cap for my '30 coupe a couple of years ago when I decided to take it out for a drive. But, I did have an extra Radiator Cap. As Mike explained, it will Not fit properly. But since I didn't have a gas cap, I decided to use that old Radiator Cap just to see how my coupe ran. I wired some Large Steel Hex Nuts to the bottom of the Radiator Cap. They then hung below the cap, holding it down. I drove it slow and it worked fine. Smooth road of course.

The next day I ordered a new Gas Cap and seal......

P.S. DO NOT TRY THIS AT HOME...... (AS THEY SAY)