djet fuel pump problems... Options

[biggy72]

Do djet fuel pumps ever have the fuel pump portion go bad and not the motor portion? Mine is pumping more fuel out the return port than it is out the high pressure port. I pulled it apart and everything looks to be ok, but maybe it's just worn out. I have the pump out of the car and I was bench testing it so I'm sure it's not just incorrectly plumbed or wired.

I'd like to put a new pump under the gas tank, but I would need to run new fuel lines to take the pressure to do that and I was just hoping to get it up and running to make sure everything is working ok before I jumped into a project like that.

[swl]

I had the problem you describe and figured it is the rubber piece on the centerline side of the pop off valve. It sticks in the bypass mode instead of moving out when the fuel starts flowing. That valve, from what I have gathered, was intended to shunt air in the line to the return rather than pressurizing it to the fuel rails. The air doesn't have enough pressure to move out the pop off but fuel does. When the rubber tit gets sticky even the fuel doesn't have enough pressure to move the pop off out. I never found a solution. No rubber kits available - had to write off the pump.