Thread: MSD Pump Booster Install

I installed PRJs fp rewire a year or 2 ago. I do have the PnP kit for installing a boost a pump. I do not have any instructions.

I have the instructions for the MSD unit itself. Does not seem like a issue EXCEPT it states that the relay that comes with the MSD unit must be wire to the factory fuel pump relay. Problem is, it does not say what pin on the factory relay.

Wiring diagram is here (PDF takes a few seconds to open):
http://www.msdignition.com/instructions/Products/2350_instructions.pdf?terms=2350

I did in fact talk to PRJ. Between what he said and studying the diagram,

To update what I did was:

Tossed the MSD Relay, Connected the Orange wire to the Racetronix PNP on relay side, connected Long Red MSD wire to the PNP on the pump side, connected both black wires to my inner fender via a bolt as the Racetronix is grounded to the crossover by the tank (I know I only had to connect the short one). I checked continuity to the inner fender and it was strong, so was comfortable doing this.

The long black wire was 12 gage. Being in a loom, when I cut that to attach to inner fender, I then soldered the orange wire to what was left of it in the loom, so I did not have to run another loom or wire back to the pump area. Now I had my orange and red wire in the same loom ready to run. I mounted the MSD inside my Wizaired Box, and ran the wire loom to the pump on the upside of the fuel lines.

After looking at the harness and schematic of the MSD closer, and talking to PRJ, it made a lot more sense how everything worked.