Hi, I have a 1964 Super Dexta with the Simms mechanical governor fuel pump. When I pump the lift pump lever, fuel comes out of the pig tail vent tube. I did some research and it seemed like a ruptured diaphragm in the lift pump could be the issue.
However, after I removed the lift pump I could pump the lever and build pressure by blocking the outlet with my finger. The pressure holds, doesn't leak down. This makes me believe the lift pump is not the problem.
Where should I look now?
However, after I removed the lift pump I could pump the lever and build pressure by blocking the outlet with my finger. The pressure holds, doesn't leak down. This makes me believe the lift pump is not the problem.
Where should I look now?