Well im finally back in the diesel buisness after selling my 06 I now just bought a 2001 Cummins. After bringing it home I noticed the lift pump was replaced with the Fass HPFP pump. The issue is the pump only stays on for a second when the key is turned to the on position and does not run after the truck starts. After doing all my tracing and testing I found that the pigtail that connects to the truck that tells the pump when to come on does not. It only gives power for a second. My question is can I just bypass the truck connection and just wire the pump to a keyed on circuit like the windows. That is how I did my airdog setup on the 06. Thanks for all the help

HotRod

 

I just spoke to the guys at FASS yesterday about this and was told they do this quite often. I will be doing the same this weekend
You may or may not throw a code but it won't affect anything.

 

One thing to consider ....what happens if you are in an accident? What shuts off the fuel pump?

I installed a pressure switch to a oil port on the Driver side of the block - the switch closes when oil pressure is greater than 5 psi. If the engine shuts off - the oil pressure drops - and power to the fuel pump is terminated!

 

When I dropped the tank to install the new larger fuel pick up tube, I upgraded to the new wiring harness from FASS that includes a relay. The power comes directly from the battery now and the stock fuel pump connection only powers the relay.

 

The stock connection only sends 9 volts to trigger the relay and there have been problems where the computer has an issue where it will send less voltage not being able to trigger the relay.
That is the main reason I would run another line to the relay.

I had planned on doing this but found my issue to be something else and took care of it.