[DSL JEEP]

mid 80"s 6.2 n/a will not start hot. Seems to be heatsoak related. pulled top off pump and found fuel control solenoid was cracked and replaced it.


Funny tho, if i jumper the cold start solenoid under this condition engine starts right up. Any thoughts? TIA!

 

[DSL JEEP]

On top of the pump there are 2 solenoids. 1 controls the fuel on off and lays in a tub of hot diesel fuel. The other is the cold start, which controls timing advance on cold startup as i am to understand.


The location of the injection pump in the valley of the engine lends itself to amazing amount of heat the longer it is shut off and is probably the last part to start to cool off [heat soak].


After driving for 1 1/2 hours and shut down for 45 min that pump is HOT!


When i attempt to start it wont fire [no fuel to injectors] as soon as i hot wire the other solenoid it starts right away and i have no idea why. This is not a glow plug or injector issue. The pump will not pump fuel untill i hot wire the other solenoid.

 

[DSL JEEP]

traveler i have got two of the best batteries out there. Odyssey dry with 1200cca each. But to test that theory out i will jumper the pump from a remote battery.


I was told that jumpering the cold start reduces the head pressure exactly as you say and the pump pumps. Usually takes 15 to 20 min before the heat gets at her. Also was told that the radial pump gets out of tolerance when hot and that combined with the pressure causes a no pump condition.


Now i can live with knowing that but my concern is that this pump is just over one year and about 400 hours old. Whats to say that if i get an exchange unit i wont have the same problem again soon. Up here in Canada it cost me $750.00 to rebuild my pump, and was quoted $1000.00 for that part alone.


Thank you for confirming my suspicions and taking the time to reply. Any recomendations as to where to go from here? Best regards.

 

[DSL JEEP]

This is an easy thing to check. I will power the pump from another source and let you know.

 

[DSL JEEP]

I hear ya. Right now i drive around with a gallon of water to cool it off. Has sat now for 1 hour and started right up with the new fuel solenoid. Maybe just maybe it was that, but i dont trust it so i think i will keep the water handy.

Thanks again.

 

[DSL JEEP]

Ah umm i dont think the tranny has anything to do with the engine not starting but to answer your ? nv4500. Maybe the trans and engine dont like each other anymore. LMFAO!