my factory one from 87 failed. new replacement ones might not
im running about 45psi ish. when it failed fuel would flow through the valve and go into the other tank. well i didnt have the tank hooked up and fuel was just flowing out of the hose like it was cool. i lost about 1/4 of a tank before i realized what was happening. thats my experience, i have not purchased a new one or installed the new fuel tank.