Have not yet tried any but my original RAM 500 pump. I would try Carlos at RTI for a replacement pump if necessary. However, I do fly my RAM 500 with its original pump, doing manual starts using an Eco FADEC, Hall sensor & thermocouple from Wren, with a 5 cell 1100 ma NiMH pack for the pump. If/when my original pump goes, I would ask Wren and suspect they could recommend one of the fuel pumps they use with the same FADEC for the MW-54. Not sure their pumps would work with the RAM ECU. Bob Price might know.