Hi' I just replaced the in line electric fuel pump on my 58 olds. It is only there for vapor lock and for sitting a long time. Question is how long will it take for the fuel to screw up the rubber in the pump. The rubber in the other pump swelled up and plugged the fuel line. It was in the car for several years. Now after a few weeks, months the new pump is acting like it is out of fuel just like the other pump. Fuel bowl is empty so I know it is before the fuel bowl. Can this new fuel screw up a pump that fast?????? I replaced it with the identical pump. Maybe it is real old laying on the shelf for a long time. ANY THOUGHTS
Ed

 

Guess time will tell as to how long? However, it does seem as though a newly purchased pump should be made of ethanol compatible materials?

I would be inclined to take a back for a refund/replacement if in fact it is not ethanol compatible.

 

What makes you think the new pump is bad? Could be you had more than one problem in the fuel system.

 

check all your lines and hoses, and the filter. just because your pump is new, does not mean it is good. i have have bought lots of new junk that don't work.

 

Did you get all of the rubber/debris out of the line, as you stated that rubber clogged it initially from the old pump. x2 on checking all your lines and filters again. You could also remove the pump and bench test it to eliminate it as the problem or not. In not sure on your year vehicle, but some years such as my 1963 has a sock type filter in the tank. Disconnect the fuel line to the pump, and if you have good flow, then the sock, if you have one is ok. As far as how long a pump would last without knowing its manufacturing date, your guess is as good as anyone's. I had a NOS mechanical fuel pump with rubber components not designed for today's fuels, and it lasted about 2 months. I hate to say this, but if you had rubber pieces in your lines, you may have some also in the mechanical fuel pump. Any blockage equals no flow. The electric pump will just free wheel. Let us know what you find.