Well, after speaking with a rep from Gates, any fuel line that is submersed in the tank that is not SAE 30R10 submersible line will degrade 'orly"?. So I bought some 3/8" submersible line from gates and took the old stuff out. I also did the BAP wire upgrade with a 40 amp relay and 10 awg wire to the pumps from the fpdm. I'm pretty pleased with the outcome and should have fuel for days. I have GT pumps, Modified FPDM, -8 fuel line upgrade, submersible fuel pump line upgrade, BAP, BAP wire upgrade, and 10 awg wire to the pumps from the FPDM.