Fuel tank vent valve m170 m38a1

bl5211a · Post by **bl5211a** » Mon Sep 30, 2019 5:20 pm

How does one test if the fuel tank vent valve is still good ?
Part 8332556 valve, fuel tank.

Should I be able to blow air through it ?

Brian

Post by **wesk** » Mon Sep 30, 2019 6:26 pm

It should flow one way. IN. Do not forget the tank has two vents. The valve on top and the filler cap. If you are having trouble with the tank not feeding the fuel pump well it is often the cap's vent valve which someone had closed for fording and forgot to open.

bl5211a · Post by **bl5211a** » Tue Oct 01, 2019 5:15 am

Thanks , is there a crack pressure for the in valve ? Couple psi maybe ?

bl5211a · Post by **bl5211a** » Tue Oct 01, 2019 5:21 pm

Hey Wes , I was able to test with psi on in side , it’s cracking open at a few psi in .