* Inline fuel pump (most common): It's usually mounted on the frame rail, near the fuel tank, somewhere along the fuel line. You'll likely find it under the truck, near the middle or towards the rear.
* In-tank fuel pump: Less common in 1979, but possible. If it's an in-tank pump, it's located inside the fuel tank itself, requiring tank removal to access.
To find it definitively, you'll need to:
1. Consult a repair manual: A 1979 Ford F-100 repair manual specific to your engine will show you the exact location.
2. Look under the truck: Carefully inspect the frame rails near the fuel tank and follow the fuel lines. The pump is likely somewhere along this path.
3. Trace the fuel lines: Start at the fuel tank and follow the fuel lines forward. The pump will be somewhere on this line.
Remember to be cautious when working under the truck. Support it properly and wear appropriate safety gear.
