Hey all, I've tried everything I can think of and I can't resolve this issue.  My 2000 automatic won't start because the lift pump (raptor 150) won't turn on.  I had only 3000 miles on it before it suddenly stopped working.  So I checked my ASD relay and my fuel system relay, both were fine.  So I unplugged the pump and bumped the starter and checked voltage with my multimeter.  Got a healthy 12.3-12.7 volts.

 

So I figued the pump was bad and got a new one under warranty.  When the new one came in, the same issue continued.  I figured maybe there was some glitch and the ECM was telling the motor to defuel because the check engine light with p1693 came on when it stopped wanting to start.  I suspect 1689 because I used to get that once in a while during hard starts.

 

So I unplugged my battery terminals and let everything reset.  Plugged everything back in, issue is still there.

 

So what's up?  Should I just hard wire the pump in to the battery?  Is there another relay that could be bad?  How do I go about testing the ground for the pump?

 

Oddly, the truck started without the pump plugged in and ran long enough for me to limp it 2 miles home, but turning it on and then plugging in the pump caused it to die immediately.

I also installed a Raptor universal from XDP. Am I supposed to have a relay between battery and the Raptor being triggered by the stock dodge wiring? It works OK being driven by the stock loom but I do not want to damage anything.

Doing it that way does take the stress off of the ECM. Right now, all the power to run the pump via the stock harness is actually coming from the ECM.

Doing it that way does take the stress off of the ECM. Right now, all the power to run the pump via the stock harness is actually coming from the ECM.

Thanks, I will rewire it with a relay.

You might try to find a wiring harness for a raptor. Then you have everything

So here's what I did: just the most basic solution imaginable. Wired it into the battery with a switch that I mounted in the little dash cubby. Actually doesn't look all too bad, got a light up blue switch that matches my truck. But everything has worked great so far with this setup, so on to more fun truck projects. Next up is a boost elbow, boost gauge, and just maybe some injectors.

Did you fuse it?

Did you fuse it?

No, I didn't.  Maybe a 15 amp inline fuse?