Jump to content
  • Welcome To Mopar1973Man.Com

    We can see that your guest and been lurking about. When you register on the Mopar1973Man.Com site you'll be able to interact with all the other members. This is the most friendliest Cummins forum you'll ever join. Take the time right now and  REGISTER  on the Mopar1973Man.Com this will open up many more options and functions on the website. Everyone is very friendly and helpful just ask questions and everyone will help you out the best they can. 

Recommended Posts

Guys I’m pretty sure this topic has come up so sorry if the question is redundant.  2000 Cummins was starting fine and also idleing fine, but if I gave it and throttle the engine would shake.   Tried checking the pressure on the lift pump, 0, none at all.  Figured it was a bad lp so I dropped the tank and swapped it for a new one.  I bumped tested the new one and nothing.  Now truck will not start.  Checked my relay and swapped it out with the horn relay and truck still honks.  Please help!!!

Link to post
Share on other sites

Check the ECM plug to lift pump for voltage, it's somewhere in ecm area. If you're getting nothing then could be a bad circuit in ecm, fried because of wiring issues. WT mod and accessories noise on alternator are first things to do. Then if circuit is bad there are other ways of tapping to things with relays to get it working without spending money of fixing ecm.

Link to post
Share on other sites
  • Board Of Directors

Here's the diagram for wiring in a relay.  The yellow/white wire should have power when you first turn the ignition on or bump the starter. Test with a volt meter or test light.

 If the #30 terminal is jumped to #87 the fuel pump should run. 

 

1285609517_Scan_20170219.jpg.e85a9ee78fffd2f2e79e6d1fda86e8b21.jpg.4e0bd9897eb9fdc4d2422f492b7c1198.jpg

Link to post
Share on other sites

This could be part of your problem. A wiring issue or computer issue.

 

As far as your lift pump, where did you swap the relays, in the PDC? I ask because the in tank pump most likely has the relay and the fuse for the pump on the firewall. Thats where Dodge put mine. It is possible the fuse on the pump blown also. Was the first pump running when you saw 0 psi?

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...