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New Large Mouth Fuel Tank Gas Cap
Fits 50-66 M38, M38A1

Part # A6333

New Replacement Fuel Tank Gas Cap

Great reproduction gas cap in the original large mouth style. Help keep your military vehicle original.

Proper vented cap with the valve inside for deep water fording.

Comes complete with rubber gasket and chain attached.

50-52 M38
52-66 M38A1

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It says. This is the Proper vented cap with the valve inside for deep water fording. But in the Q and A you say this a non vented cap. Which is it vented or non vented?

Willys Jeep Parts Tech:
This cap was changed to a different style. It is indeed a vented cap.

I bought a new cap that was too small for the new tank I put in. The diameter of the 'hole' on the spout is: 1 13/16” inside diameter (inside spout hole) or 2 5/8” Outside diameter Will this 4.5" cap work?

Willys Jeep Parts Tech:
No that doesn't sound right.

Is his cap vented?

Willys Jeep Parts Tech:
Ths is an unvented cap.

1946 Cj 2a, seems to need a large mouth gas cap. Maybe tank from a different vehicle. Whats the outside diameter of the large mouth gas cap? dont want to order the wrong cap.

Willys Jeep Parts Tech:
They are 4.5" OD

Does this gas cap come with a gasket or o-ring on it already?

Willys Jeep Parts Tech:
Yes it comes complete with gasket.

Are there any locking gas cap options out there for a 1953 M38A!?

Willys Jeep Parts Tech:
Sorry, there are not.

My 1951 M38, apparently, had its tank replaced with a CJ tank (smaller filler neck) at some time in its life. Is it possible to obtain just the 4" fill neck to have a shop weld that in place and properly adapt this tank to my military-spec vehicle? Would your tank supplier be willing to sell that important part separately through you?

Willys Jeep parts tech:
Sorry, you cant get just a spout for it. You would have to fabricate that locally.

What are the measurements of the gas cap?

Willys Tech:
It is 4.5 OD
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