Bosch fuel pump plubing ???'s

[Blown353]

Restriction on the inlet side of the pump is a bad thing.

Personally, I'd run -10 from the tank to coarser pre-filters and -10 from the pre-filters to the pumps, then -8 out of the pumps to the regulator, then -6 or -8 from the regulator back to the tank. Run the return line the same size as the feed if you want to play it totally safe. I'd also put a fine fuel filter just before the fuel rails to keep junk out of the injectors (or carb.)

Are you going to run the 2nd pump off a Hobbs switch? If so, I would "tee" two Hobbs switches together for redundancy, so if one fails the other one will still turn the 2nd pump on.

Troy