87 Chevy Truck Fuel Pump Wiring Diagram

By | April 30, 2023

The 1987 Chevy truck fuel pump wiring diagram is a simple and easy-to-follow guide that can help you troubleshoot and repair your fuel pump. This diagram shows the location of the fuel pump, the fuel pump relay, and the fuel pump fuse. It also shows the wiring connections between these components.

If you are having trouble with your fuel pump, the first thing you should do is check the fuel pump fuse. The fuel pump fuse is located in the under-hood fuse box. To check the fuse, use a voltmeter to test for continuity between the two terminals of the fuse. If the fuse is blown, you will need to replace it with a new fuse.

If the fuel pump fuse is not blown, the next thing you should do is check the fuel pump relay. The fuel pump relay is located in the under-hood fuse box. To check the relay, use a voltmeter to test for voltage at the relay terminal. If there is no voltage at the relay terminal, you will need to replace the relay.

If the fuel pump fuse and relay are both good, the next thing you should do is check the wiring connections between the fuel pump, the fuel pump relay, and the fuel pump fuse. To check the wiring connections, use a voltmeter to test for continuity between the terminals of the fuel pump, the terminals of the fuel pump relay, and the terminals of the fuel pump fuse. If there is no continuity between any of the terminals, you will need to repair the wiring.

If you have checked all of the components and connections and the fuel pump is still not working, the next thing you should do is replace the fuel pump. The fuel pump is located in the fuel tank. To replace the fuel pump, you will need to remove the fuel tank.

Replacing the fuel pump is a relatively simple task, but it can be messy. If you are not comfortable working on cars, you may want to take your truck to a qualified mechanic.

Here are the steps involved in replacing the fuel pump on a 1987 Chevy truck:

  1. Disconnect the negative battery cable.
  2. Remove the fuel tank.
  3. Disconnect the fuel lines from the fuel pump.
  4. Remove the fuel pump mounting bolts.
  5. Remove the fuel pump.
  6. Install the new fuel pump.
  7. Reconnect the fuel lines to the fuel pump.
  8. Install the fuel tank.
  9. Reconnect the negative battery cable.

After you have replaced the fuel pump, you will need to bleed the fuel system. To bleed the fuel system, start the engine and let it run until the fuel pressure gauge reads 30 psi. Turn off the engine and wait for the fuel pressure to drop to zero. Repeat this process until the fuel pressure stays at 30 psi.


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