Here's a breakdown of the complexities and considerations:
Challenges:
* Fuel Tank Modification: The biggest hurdle is that you'll need to modify the fuel tank to accommodate a fitting for the fuel line to exit. This likely requires cutting a hole in the tank, which is risky and requires expertise in welding or using tank repair kits (properly). A poorly sealed tank can lead to leaks and is a serious fire hazard.
* Fuel Line Routing: You'll need to run new fuel lines from the external pump to the fuel tank and from the pump to the fuel rail (engine). This requires careful planning and routing to avoid interference with other components and prevent damage or rubbing of the lines. Properly clamping and securing the lines is critical.
* Pump Selection and Mounting: You'll need to choose an appropriate external fuel pump with the correct flow rate and pressure for your engine. You'll also need to find a secure and accessible location to mount it, ensuring adequate ventilation and protection from damage.
* Electrical Wiring: You'll need to run new wiring from the external pump to the existing fuel pump relay and circuit. This involves proper gauge wiring and connection to prevent overheating and ensure reliability.
* Pressure Regulator: Depending on the chosen external pump, you might need an inline pressure regulator to ensure the correct fuel pressure reaches the engine. Incorrect pressure can damage the fuel injectors or cause poor engine performance.
* Priming the System: External pumps may require a manual priming process after installation or potentially after any interruption of power to the pump, making starting the vehicle more difficult.
Difficulty:
The difficulty is high, especially for someone without experience in automotive fuel systems. It requires considerable mechanical aptitude, welding or fuel tank repair skills, and a solid understanding of fuel system operation and safety. Improper installation can lead to fuel leaks, engine damage, and even fire.
Recommendation:
Unless you have significant experience working with fuel systems, this is not a recommended modification. Replacing the *internal* fuel pump is a much more manageable task. The risks associated with modifying the fuel tank and potentially creating a fire hazard greatly outweigh the potential benefits of an external fuel pump in most cases. If you are experiencing fuel pump problems, consider simply replacing the internal pump with a compatible new unit. If you insist on an external pump, seek the assistance of a qualified mechanic experienced with fuel system modifications.
