When will the engine light go off to see if it is in alarm or just the light on before the engine starts?
I get 10.8 volts at the 2 wires on the heui pump when the engine is cranking, so does this eliminate the chance of any of the other sensors i.e. oil sensor, coolant sensors etc disabling the heui pump?
With that said my fuel line comes from the tank to the fuel/water seperater then to the fuel pump (I think the transfer pump section that is bolted on the heui pump) then it goes to the secondary fuel filter where the manual primer is and then to the block. If I crack the discharge side of the primer pump (the line going to the block) and pump the primer there is plenty of fuel and no bubbles coming out. If I leave this same fitting cracked and crank the engine NO fuel comes out of the fitting telling me engine isnt getting fuel because of bad fuel pump or disabled fuel pump because of ecm shutdown.
I dont think its a air issue since there is plenty of fuel when the primer is pumped.
I had started the truck then it stalled 5 seconds later, I then restarted it , it ran fine I moved it about 40 feet away , shut it off topped up the oil and it wouldnt restart, I used that thick lucas oil addititive so I thought maybe it wasnt making the oil sensor so it wouldnt let it start , but then I did have voltage at the heui wires so I figured all was ok on that end.
Im thinking about just changing out the heui pump and then puting on new fuel filters. I just want to somhow prove the pump is bad first and make sure it isnt a different alarm holding it off.
Thanks for your help so far