bob.o, welcome to iRV2.com. We are glad to have you join us here and look forward to reading of your adventures and experiences. Sorry I can't help you with the fuel pump issue but someone else here might. I do wonder if it is a fuel pump that has been modified and not that you can modify the on you presently have? Good luck and let us know the outcome. Take care and have fun.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7