Bosch 044 fuel pumps mount in-line (out side of your gas tank), most commonly rear center under your car or truck. Each Bosch 044 in-line fuel pump provides 300LPH of flow and operate at 72.5 PSI. Bosch 0-580-254-044 fuel pumps are comparable to the Walbro 255LPH high pressure in-line fuel pumps which can both support vehicles for up to 600-700 horse power. Can be used in sequence with an in-tank Bosch 040 fuel pump.