420 - 1957 Question about pressure in the fuel tank.

dr1zsk1 · Post by **dr1zsk1** » Thu Oct 08, 2015 8:25 am

I posted the other day about excessive pressure in my fuel tank.

Its a 420 - 1957

A fella I know suggested that an intake valve can stick and cause pressure in the fuel tank. I guess I'm curious if anyone has heard of this?

Mike

Stan Disbrow · Post by **Stan Disbrow** » Thu Oct 08, 2015 9:16 am

Hi,

Um, no. It would just backfire thru the carb and air cleaner.

Stan

dr1zsk1 · Post by **dr1zsk1** » Thu Oct 08, 2015 9:25 am

That sounded really weird to me - but I had to ask cause I don't know stuff. LOL

Paul Buhler · Post by **Paul Buhler** » Thu Oct 08, 2015 11:10 am

Sounds like a vent is plugged, and when the engine is run, or the sun shines hot, etc. heat causes the pressure to build. JMHO. Paul

Stan Disbrow · Post by **Stan Disbrow** » Thu Oct 08, 2015 2:36 pm

Hi,

There is one thing which just occurred to me. I had to run in and post.

Your battery hold down!

If that battery moves around, it is all too easy that it contacts the tank bottom. This can be intermittent. So, rather than the battery catching fire under the gas tank, it could just heat the tank up.

That would force gas out in a hurry when you removed the cap.

And, on a crawler, it is a lot more likely that the battery wants to move around than on a wheel tractor.

I was just digging up a couple drain tubes today, and even that simple dozer job made for a lot of operating angles I never have on a tractor.

Stan

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420 - 1957 Question about pressure in the fuel tank.

420 - 1957 Question about pressure in the fuel tank.

Thanks Stan

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