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Message: <blockquote data-quote="reivaxtorres" data-source="post: 356193" data-attributes="member: 8890">what did you need to know?96 - 97 = continuous voltage pump, always pumps out the same amount of fuel regarless of engine load. Fuel Pressure Regulator (FPR) controls the amount of fuel that goes back into the tank (return style system)98 = hybrid system. alternating voltage, meaning the flow of fuel is based on the amount of voltage sent to the pump, which is controlled by the ecu. FPR still controls the amount of fuel that gets returned to the tank, so this is still a return style system. not exactly sure why ford decided to create a hybrid system for this year tho, but it incorporates the alternating voltage pump style of the 99+ cars with the return style of the pre 97 models.99+ = alternating voltage pump, ECU controls the voltage sent to the pump with in turn controls the amount of fuel it pumps out. it is no longer a return style system, so there is no FPR present in these cars. fuel flow is solely based on voltage input from the ECUmy general understanding of this is that you can use either the pre 97 pumps or the 99+ pumps (cant remember which one is semi-compatable with the 98 model year. one is and one isnt), but you run the risk of frying the pump.</blockquote>