Here's why:
* Accessibility: The fuel pump is located in the fuel tank, requiring tank dropping or at least partial dropping. This is labor-intensive and can be messy.
* Safety: Working with fuel is inherently dangerous. You need to take precautions to prevent sparks and fires. Properly disconnecting and venting the fuel lines is crucial.
* Tools: You'll need specialized tools like fuel line disconnect tools, possibly a fuel tank strap wrench, and sockets/wrenches for various bolts and fasteners. A fuel pump removal tool can be helpful, but not always essential.
* Potential Complications: Rust and corrosion on the fuel tank straps or bolts can make removal difficult. The fuel lines can be brittle and prone to cracking. You may encounter issues with the fuel sender unit if it's integrated with the pump.
Factors affecting difficulty:
* Your experience level: If you're comfortable working on cars and have some experience with fuel systems, it will be easier.
* Your tools: Having the right tools makes a big difference.
* Condition of the truck: Rust and age can significantly increase the difficulty.
In short: If you have basic mechanical skills, are comfortable working with fuel, and have the necessary tools, you can likely do it yourself. However, if you're unsure, taking it to a mechanic is always an option. The cost of labor might be comparable to the cost of parts and tools, depending on your location. Weighing the time investment and potential risks against the cost of professional repair is a good idea.