Why wont my fuel pump come on?
We tested the with a voltage meter. We get 12 volts at the plug for the pump for 2
seconds when turning on to the on position & 12 volts continuously when cranking over
but when we plug in the fuel pump it does nothing. We ran jumper wires from the pump to
a battery directly & it fires up. Totally baffled here.
Check the pumps connector at the tank, the connectors are known failures, usually when you buy a replacement plum it is included in the box. I had a Tahoe that I had long enough for it to burn through 2 fuel pumps, on the 2nd pump I had to replace the plug, you couldn't see a problem without shining a light through it then you could see the black corrosion inside it. HTH
Changed the plug (again) when I have the pump unplugged & check I got voltage (to either side of the splice & at the plug. However when I plug it in I have no voltage at the splice (either side). Changed the low oil/fuel pump switch, also replaced the fuel pump relay. The first pump we replaced was 9 months ago, so it was under warranty took it in replaced it with another new pump (thinking it was the pump, then took it out went & got yet another pump still same issues.)
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