To find the correct fuse or relay:
1. Consult your owner's manual: This is the best starting point. It should have a diagram showing the fuse box layout and what each fuse protects.
2. Check both fuse boxes: Most Ford E-150s have two fuse boxes: one under the hood and one inside the passenger compartment (often under the dash).
3. Look for fuses labeled: "Fuel Pump," "EFI," "Engine," or similar. A relay related to the fuel pump might be labeled as such.
4. Use a multimeter: If you can't find a clearly labeled fuse, a multimeter can help you test for power at the fuel pump's wiring to determine if a fuse is blown upstream (meaning the fuse is faulty and is causing a problem) and not a problem with the pump itself. Caution: Working with car electrical systems can be dangerous. If you're not comfortable with this, take your van to a qualified mechanic.
5. If you still can't find it: A mechanic or auto parts store employee familiar with Ford E-150s can likely help you locate the correct fuse or relay. Providing the engine size (e.g., 4.6L V8, 5.4L V8) will help them narrow down the search.
Remember to always replace a blown fuse with one of the *same amperage rating*. Using a higher-rated fuse is dangerous and can lead to electrical damage or fire.