6 Volt Carter fuel pump problem

I noticed that a lot of us are running the Carter electric fuel pumps as back up or in place of the engine driven pumps. I recently had to replace one that was only 2 years old and had maybe 3000 miles on it. I bought it from 5th Ave auto parts, so I called Randy. He suspected that gas had set in it over the winter and recommended running WD40 through it and then putting Staybul additive in my gas from now on. I couldn't get it working right, so I bought a new one a few months ago and it has now quit.

When I got under the car to check it out I noticed that if I wiggled the pump it would work under certain conditions. What I found was that if the pump is in the slightest bind in mounting, or the fuel lines aren't aligned with the pump, it will not work right. You can actually adjust the speed the pump runs at by flexing the attached fuel filter that they send with it that is factory mounted in front of the pump, or by bending the in or out fuel lines slightly.

The mounting clamp that they send with it also gives you a hint about how close the internal tolerances are. Even when the clamp is completely tightened it still holds the pump loosely. I believe that since the pump is gear driven the gears are VERY close to the inside case, which it probably has to be to work correctly.

I had mine mounted in the frame arch over the axle close to the tank, and this put it in a slight bind and was causing my pump to run slow or not at all.

My advice is to make sure the pump is almost free floated in it's mounting and clamp the fuel lines in straight alignment with the pump.