Fst_Byrd

iTrader: (5)

Hey all,

I'm trying to get everything squared away for the fuel system in my swap- TBSS LS2 in a 1964 Cutlass.30A

Background on what the setup will be- Stock tank with sock filter -> Carter 4070 external pump -> surge tank with Bosch 044 inclosed -> vette regulator filter
Return from Vette reg will dump back to the surge tank, then overflow from the surge will go back to OG fuel tank.

I'm a little lost on how to wire both pumps to turn on/off together... Can I splice into one fuel pump harness and run both from the same harness? I doubt it because the 044 is a hungry MF and pulls 18Amps under full load, so should I just run two relays/fuses and run them individually?

The PCM only has one wire to trigger the pump, whats the best way to split that into both relays?

Thanks in advance

Dan

Forcefed86

iTrader: (4)

Splitting the signal into 2 relays is fine and What I would do. The relay trigger doesn't take much amperage.

Fst_Byrd

iTrader: (5)

​​​​​​So on the PCM, pin #45 is for fuel pump relay trigger. I split that to power 2 different 40 amp relays, have each relay setup with an online 30amp fuse then individual 12GA wires back to each pump?

Forcefed86

iTrader: (4)

Might check if that pin is grounding or supplies 12v. Either will work to trigger relay. Just have to wire it correctly

Fst_Byrd

iTrader: (5)

Makes sense and is easy enough. Thanks for your help!

stevieturbo

Unless you're running the 044 at 100psi or so, then no way will it pull 18A.

But anyway, whether you decide to use one relay, a pair of relays...whatever. Wiring and all connections etc needs to be up to the task regardless of how it is done.