i have a 1987 chevy s-10 blazer 4x4.we changed the fuel pump but it still didn't work.so we jumped it from the battery and by doing that the truck will start and run but cut off when we pull the jumper wire.What all do I need to check and/or replace to fi

Submitted by half-dumb Sun 07/25/2010

check fuse, relay and power

Submitted by jerryh20 on Sun, 07/25/2010 - 07:45.

check fuse, relay and power at the pump connection

Make sure that the fuel pump

Submitted by bfree on Sun, 07/25/2010 - 13:43.

Make sure that the fuel pump fuse if good (check it with a test light).
Locate the fuel pump relay. You should be able to hear/feel it click when the ignition switch is turned on [do not start engine).
If not, remove it and check its' socket for power. If power is present switch the fuel pump relay with another identical relay (truck should have at least one more relay like the fuel pump relay). turn the ign. switch on; you should hear/feel the relay click or hear the pump running (or you can use the test light to check for power at the fuel pump electrical connection). If so, replace the faulty relay. If not, find the open in the wire between the fuel pump and fuel pump relay (remove relay and ohm test power wire from relay socket to fuel pump electrical connection).

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