Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
You replaced the lift pumps?
How do the lobes on the cam shaft look
It is possible did you put a test light On the wires going to the lift pumps?
Then it's not the ecm.the actual injectors Are in the head and could be plugged or no good
Are you getting the right voltage to the lift pumps
Check the lines that pass through the head
And this problem just started after you changed one of the pumps?
If you remove wires from the pumps do they still send fuel
So it sounds like an electrical issue?
Pull the cam and have it tested..do you have a sister truck you could swap ecm with
Thats the only thing it could be the rest of the system is mechanical..good luck and let me know how it works out