To troubleshoot, you'll need to check these things in this order:
1. Check the fuel pump fuse: This is the *first* thing to check. The location of the fuse box varies slightly by model (depending on options like towing packages). Consult your owner's manual for the exact location and the fuse for the fuel pump (it's often labeled as "fuel pump" or something similar). Look for a blown fuse (a broken wire inside the glass or metal housing). Replace it with the same amperage fuse if needed.
2. Check the fuel pump relay: The relay acts as a switch for the fuel pump, turning it on and off. The relay location also varies by truck configuration. Your owner's manual will tell you where the under-hood fuse/relay box is. You can usually identify the fuel pump relay by its markings or by using a wiring diagram (also found in the owner's manual or online). You can test the relay using a multimeter or by swapping it with another relay of the same type (if you're comfortable doing this).
3. Check the fuel pump wiring: Carefully inspect the wiring harness leading to the fuel pump for any damage, shorts, or loose connections. This requires getting under the truck and checking the wires near the tank.
4. Check fuel pump pressure: If the fuse, relay, and wiring are good, the problem is likely the fuel pump itself. A mechanic can properly test fuel pressure to confirm. A pressure gauge is needed to check this.
Important Note: Before attempting any of these steps, disconnect the negative battery cable to prevent electrical shock. If you are not comfortable working on your vehicle's electrical system, take it to a qualified mechanic.
