pressure building up in fuel tank

I have a 49 TO 20 & when you use it much the fuel builds up pressure in the tank , have tried a new gas cap but still does it the tank has been cleaned at a radiator shop & had a liner put in ( sprayed I think )
 
i had preasure building up on my te20.the gas was boiling after you used it for awhile.i got some heat barrier material from napa and put it on the bottom of the gas tank.it helped on my te20 a lot
 
as said before check and be sure you have a vented gas cap.

auto gas caps are not vented, someone may have installed a auto gas cap

my to35 has a metal shield under gas tank and its over the exhaust manifold. check with someone else who owns a tractor like yours that is not having the heat problem, see if your tractor has the same heat shielding as the tractor that does not have the heat problem.

maybe someone on forum will make a picture of their tractors heat shield.

need to get this problem fix as this could be a very serious safety problem.
 
As others have said, "will-fit" gas caps designed for modern cars can be deadly when installed on tractors that were designed for fully vented gas caps (NO pressure/no vacuum). Check out some of the posts regarding free tractor gas caps from the tractor companies to help avoid the flash fires that happen when something lets go.
 

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