Help with a fuel pump issue Options

[pgeorgeson]

I just bought a 1974 2.0 and am having a fuel delivery issue.

I am not getting any output from my fuel pump. There is fuel supply to the pump (into the S port) from the tank and through the filter. I removed the output line ("D" port -- the middle one) and attached a test line feeding the test line into a bottle. When the pump runs, I am not getting any fuel out of my test line from the D port. I can hear it going "pssst, pssst, pssst," but no fuel ever comes out.

In addition, although it isn't sending fuel out of the D port, it seems to be pumping fuel into the return line. The reason I can tell this is that when I removed all the lines from the pump, fuel drained out of the return line where the return line attaches to the R port. After I did my test, I removed the all the lines again (to switch pumps) and quite a bit of fuel again came out of the R line again.

I have a spare pump that I got from the previous owner, and both appear to be doing exactly the same thing.

It seems like both pumps are pumping fuel into the R line instead of the D line. What is going on and how to I fix it or test it?

[jcd914]

Maybe your supply line and return line are switched at the tank. The supply line fitting at the tank picks up at the very bottom of the tank, the return line has an extension the makes it taller in the tank. If they were switched and the tank is low you would suck air from the tank and when the lines at the pump are disconnected you get fuel flowing from the return line.

Does any fuel flow from the supply line when disconnected at the pump?
Can you blow thru the supply line into the tank?

Jim