Did you use high pressure fuel injection hoses to connect to the main pump? 1/2" (12.7 mm) standard fuel hose is rated at 25 psi. With both high pressure pumps running the pressure between the pumps is about 7 psi, the main pump can out-pump the in-tank pump, if the main pump were to quit the ...

Hey everyone! I'm new so let me know if this should be posted somewhere else! TIME: 2-4 Hours (rough rough estimate) I own a 1987 760 GLE (V6), and I wanted to add a bit to the community as I have recently upgraded the in-tank lift pump from the stock 13 psi one to a Walbro 255 60psi pump. https://i...