Help School Me About Gas Tank Caps

The various oil leaks help protect the undercarriage and body from rust. The fuel leaks keeps the tank from exploding from too much fuel building up pressure, so it is a safety feature, so long as you don't light a match.

 

The black cap should be an Eaton cap, same as the AC cap used on MB/GPW Jeeps. Originally, the Tuxes came with a chrome version of the Eaton cap.
I’ve used the stainless Stant cap on my Willy Wagon, and mine isn’t vented. It would “whoosh” as I opened the cap after bouncing around down the road. How it never pulled a vacuum while driving, maybe it has a one-way check valve?
-Donny

 

Finding the chromed original gas cap for a Tuxedo Park has eluded me for 7 years now.
May just have to get the black one from Walck’s and have it chromed. I bought a NOS vented gas cap off eBay a few years back, but doesn’t have the same shape as the Tux one with the raised button.

 

x2....my experience exactly.

 

I got tired of seeing and smelling gas on a hillside. I have a tank out of a 71 1cj under my seat and the stock 73 tank in the rear. I run non vented caps on both. I have both tanks run to a expansion tank mounted behind the drivers rear tire. Made this from one of the fatter portable propane bottles. Make darn sure it is 100% empty before working on it. Lets gas in the tanks expand and not spill also vents back in. This has worked great for me for a few years. I hated putting 10 gallons in the front tank and spilling a gallon or more.