Massey 135 Gas Cap

Jo1 · Jul 4, 2014

How do I tell if my gas cap is vented? I am getting pressure built up in the tank and am wondering if my cap is vented but don"t know how to tell.

2tractors · Jul 4, 2014

Should have a hole all the way thru and you should be able to blow thru it.

maxwell99 · Jul 4, 2014

If you are building up negative vaccum pressure in the tank, then you do not have a vented cap or your cap is plugged.

Most time the tractor will stop running after 30-45 minutes.

as the vacuum builds up in the tank, the fuel will stop flowing to the carb. Open the cap and hear a swoosh sound as the air rushes in.

Clean out the vent hole or replace the cap.

Jo1 · Jul 5, 2014

That is exactly what is happening. Tractor runs fine for about 45 minutes or so and starts cutting out. I open gas cap and hear the pressure release. I checked my cap and there is no hole going thru it. The bottom of the cap has a hole but not the top. There appears to be a very small slotted screw in the top but it is really tiny and I don"t know if I can remove it.

ditchwitch · Jul 5, 2014

the under side of the cap it has a spring loaded little plug. I had to spray some break cleaner on mine because it was stuck then blow it out with air fixed it right up

Jo1 · Jul 6, 2014

I found the spring loaded plug on the underside of the cap. It is loose but there is no hole going thru the entire cap?

Massey 135 Gas Cap

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