[JerryHawk250]

Originally Posted by Lucas@Air_Lift

I think I may have figured this out. The small ~20ga power wires feed the entire EFI system.. CDI box, fuel pump, injector, all of it, I think isn't flowing enough current. I have noticed that while the bike is running, the fuel pump sounds like it is spinning significantly slower than when the bike is off and I am priming the system. A Multimeter confirms that the pump is only getting around 10V with the engine at idle, so I can only imagine that is even less as the revs go up and the CDI starts sucking down more power. I am going to try using the connector off the EFI harness to trigger a relay, and run the relay power and pump ground direct to the battery.

I am really at wits end with this project. It's very hard for me to justify spending another $100 on a new pump and regulator when I can buy a nice carb for that price. If this doesn't work, I may just give up on this

That might solve the problem. It's not a large pump but to get 45 psi i'm sure it draws some amps. Every fuel pump I have installed was on a relay. Don't give up.