Never had this problem before. Noticed today after mowing 2 acres. That I had a gas leak. Well come to find out it was leaking from the gas tank lid and doing ALOT of hissing. So I opened the gas cap/lid really slow and there was a bunch of pressure after I was able to take it off the gas bubbled and almost looked like it was boiling. I suck my finger in the gas and it was warm but not hot hot. I know the gas cap should have a vent hole. Where is it at? I know if it doesn't let air in as the gas goes out your tractor can die from lack of gas but I don't know what causes the pressure to build up inside the tank. I just want to get this fixed so I don't cause a fire and burn up a field let alone my tractor.
There is a pin point size hole in a small dome on top of the N tank. Stock N gas caps are not vented.
Ford Jubilee-- restored, pulls a finish mower once in a while
Ford 850 -- the workhorse--does it all
IH CC 122--semi retired-awaiting restoration
JD 4300HST FWDA W/Loader--- another workhorse
Looks like from your picture it is an 8n. Your 8N owners manual may show a photo of the gas tank. The N gas tank has a bubble on it that has two holes (not in line) drilled to relieve the pressure. Sometimes these holes will be rusted or painted over. You can drill out these holes but it's just as EZ to get a vented gas cap.
That said this seem to be a problem so ford dealers were offering a new cap to solve this problem.
Supposedly return your gas cap with your serial # and get a new one. Worth a shot but I won't hold my breath.
IH had a similar program. You can do it online= no problem. And it's ship to you in a couple days.
If this is not your problem then I would look at how close your gas line is to your exhaust manifold and it rubber you may want to consider changing it.
Last I read the gas cap swap had ended, go to NAPA and get a GOOD vented cap and don't look back. ALWAYS use extreme caution removing the cap if there is a chance of pressure build up, darn good way to have a fire on you as well as the tractor.
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Yeah specially with the gasoline vapors beeing more explosive than the actual fuel it's self. I think I'll just get a new cap and not worry about it. It seem really wierd though because I use this tractor almost every weekend and have never had this problem before.
Bad idea if you are serious..get a vented cap. Vents are generally not a direct hole to the inside of a tank.
Old 'n Cheap
Bad part of being older...you can remember when things that now cost $10 were only 50 cents
46 2n - waitin on me to do something to it.
47 2n - my relaxin tractor.
64 4000 - w/7 ft finish mower, scoop and bushhog.