Fuel tank-type?

bighead · Post by **bighead** » Sat Oct 02, 2021 10:15 am

Please determine the type of my tank is it from CJ2A?Thanks.

RonD2 · Post by **RonD2** » Sat Oct 02, 2021 11:04 am

Please give us a photo of the filler cap and neck where it comes out of the body.

bighead · Post by **bighead** » Sat Oct 02, 2021 1:31 pm

Yes, I'll take a picture, thank you for now

4x4M38 · Post by **4x4M38** » Sun Oct 03, 2021 7:40 am

Simpler question. How many large holes are in the top?

One for the sender?

Or?

One for the sender and
One for the fuel pickup/filter?

The civilian tanks fuel outlet is out the bottom, so the only large hole in the top is for the fuel gauge sender, shown in your photo.

Military tanks had that fitting in the bottom also, but only used to drain the tank.

bighead · Post by **bighead** » Sun Oct 03, 2021 10:28 am

For RonD2-More photos of the tank are in my gallery under numbers 30-32
For 4x4 M38-Yes, there is only a hole for a fuel gauge at the top, so it is probably a tank for civilian type-CJ2A?

4x4M38 · Post by **4x4M38** » Mon Oct 04, 2021 10:51 am

Yes civilian tank. Maybe even a CJ3A also.

RonD2 · Post by **RonD2** » Fri Oct 08, 2021 1:56 pm

Photo shows a large military size fuel filler neck, same as M38. Not the same filler neck on any CJ that I'm aware of. Hard to say what tank you have there. Part M38 maybe, part something else definitely.

4x4M38 · Post by **4x4M38** » Fri Oct 08, 2021 5:10 pm

Something else. It looks like the neck sticks out too far for an M38 tank.
Maybe my eyes, but difficult to see what’s going on from the outside of the neck to where it attaches to the tank.

Any tank that isn’t rusty and doesn’t leak is better than one that is rusted and leaks, imho.

But it sure feels like someone modified or replaced the neck with a military style.

Did not find that cap in Dr. Ryan’s book either.

RonD2 · Post by **RonD2** » Fri Oct 08, 2021 5:35 pm

I agree Brian. And he also said the tank only has the fuel filter-pickup hole fitting on top (missing the vent hole fitting), which means he should probably be using a vented gas cap or risk vapor lock. His cap is marked non-vented. Sounds like the jeep is running, so maybe there's another vent way we don't see.

bighead · Post by **bighead** » Sat Oct 09, 2021 3:09 am

Yes, the tank is beautifully clean inside, that's the main thing.
Yes, the Jeep is mobile.
Do you think that the tank with the neck is subsequently welded?

bighead · Post by **bighead** » Wed Oct 20, 2021 9:46 am

How come my Jeep is running when I have a cap on the tank that seals and is NON VENTED and there is no other vent on my tank, is there just a fuel gauge?!

Post by **wesk** » Wed Oct 20, 2021 11:27 am

Your tank is sucking air in someplace or the engine would not run long. I suggest a faulty non-vented cap or a loose fastener on something on the top of the tank. You did not offer the best view of your tank so we are limited in how well we can help you with your questions. Had you at least removed the driver's seat so we could get a good view of the entire top of the tank.

This is the type view of the tank we need to offer any real help.

bighead · Post by **bighead** » Thu Oct 21, 2021 5:25 am

If it was ventilating, it would be felt, but it is not. At the top there is only a fuel gauge and the outlet is only from the bottom directly to the pump.
When it's time to take off my seat and take a picture of the tank

Post by **wesk** » Thu Oct 21, 2021 9:54 am

The venting of the tank during operation of the engine cannot be felt or heard. It is an extremely subtle activity. The only clues you will receive if the tank is unable to vent is the engine will only run for a few minutes then quit due to fuel starvation. To establish if this is in fact the problem causing your engine to quit you simply remove the gas cap and start the engine again and if it does not quit while operating without the cap in a few minutes your tank is not venting. On the other hand the only clues that you will receive if your tank is venting is that the engine will not quit a few minutes after starting it or in the case of vent leaks not installed by the factory you may notice fuel leaking from these air leaks.

bighead · Post by **bighead** » Thu Oct 21, 2021 10:45 am

My Jeep is running all the time.
My Ford Mutt had a lot of fuel to smell from the tank cap, my Jeep also has a wide throat and there's no fuel odor, so the cap seals.
There is also no fuel leakage elsewhere.