Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Good evening an welcome to JustAnswer!!
Have you done any diagnostics on it or just replaced the injectors, supply and injection pumos and still have the issue? The code you have is P1012-FUEL PUMP DELIVERY PRESSURE TOO HIGH so the pressure is staying too high. If the actual pressure is fine I would replace the fuel psi sensor... If it really is high I would check the return line to the tank and see if it's punched or blocke somewhere..
I hope this helps,
Thanks for the reply!!
As long as you are getting 500ml in 10 seconds you are fine.. Now if you erase the codes when do they come back? Under a load or on startup? Have you monitored the fuel psi with a scantool compared to desired/actual to see if there is there is a issue or not? If you have a donor vehicle that you are borrowing parts off of then swap the common rails to see if you still get the codes..
11k @idle is way too much, you should only have 6k @ idle.. IS the engine making a chattering noise? How does it run? And does only the P1012 come back or both the P0087 and P1012 come back on start up? When did this issue start?
And are you sure the return line to the tank it not blocked?
Check the return line in the back of the head to the filter and to the tank.. Blow it out if you can and tell me what happens.. Also did this start after anything has been done to the truck?
Darn it... When you had the tank out would have been a perfect time to blow the return line out.. So you have replaced the injectors, transfer tubes, lines, common rail, CP3 pump, fuel filer housing, and lift pump but still have the P1012? If so and it really does have 11k @ idle then the problem is the return line.. Not sure if you have any of the banjo fitting we have to test Cummins but if you have one run the return line from the back of the head to a old milk jug and see how it runs.. If it runs good your issue is in the line to the tank..
Keep me posted,
Yes follow it to the fuel filter housing and blow toward the tank.. If you can't blow thru it then follow iot back and see what you find..
Yes you are correct.. The lines at the bottom of the fuel filter and see if you can blow to the tank.. Also run it into a jug and see how much fuel is returned and if the code comes back..