Fuel System

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While you can upgrade certain portions of the Ford 7.3 Powerstroke 99-03 fuel system, if you want more horsepower you should upgrade the entire system for the best results. This includes replacing the fuel pump, filter bases and filters, increasing the size of the pickup tube in the tank, and increasing the size of the fuel lines. Not only should you increase the lines from the tank to the pump, but you should also increase the rest of the lines. Upgrading the return system also helps garner more horsepower. You can also upgrade the wiring harness so that it has waterproof connections. This is particularly useful if you are going off-roading.

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