Update on stalling issue
#1
05-30-2011, 11:48 PM
Update on stalling issue
As a reminder:
I had my '95 6.5NA diesel stall out at me at random times. I've done many different diagnostic checks and ended up concluding it was the injector pump. Luckily I found a guy that sold me a brand new one for $100.00. That was pretty awesome. Once I installed I thought all my issues would go away. However, this was not the case. The engine began to surge and die out at random times.
I consulted with a friend of mine who is an engineer on a diesel tug boat and he told me it had to be the lift pump. I had checked the lift pump many times. He suggested hooking up a pressure gauge in between the lift pump and injector pump and watching what happens to the pressure once the engine begins to surge. What I found was interesting. Once i crank the engine over the pressure spikes to about 8psi and then goes to zero. I hear the lift pump running. I then disconnected it from the power supply by un-clipping the quick-disconnect and wired it up right to the battery. I started the truck and voila, i had about 12-14psi and the truck ran smooth. This pressure may be higher than the OEM because i have a Cummins lift pump installed. I then decided to keep the truck running and hook up a voltmeter to the lift pump plug at the harness end and watch the voltage. The voltage would fluctuate from 0volts to 8volts.
Where does this plug go in the wiring harness?
Where can I get a schematic with the wiring? I would like to trace it out and find out where the issue is. Any help would be appreciated.
I had my '95 6.5NA diesel stall out at me at random times. I've done many different diagnostic checks and ended up concluding it was the injector pump. Luckily I found a guy that sold me a brand new one for $100.00. That was pretty awesome. Once I installed I thought all my issues would go away. However, this was not the case. The engine began to surge and die out at random times.
I consulted with a friend of mine who is an engineer on a diesel tug boat and he told me it had to be the lift pump. I had checked the lift pump many times. He suggested hooking up a pressure gauge in between the lift pump and injector pump and watching what happens to the pressure once the engine begins to surge. What I found was interesting. Once i crank the engine over the pressure spikes to about 8psi and then goes to zero. I hear the lift pump running. I then disconnected it from the power supply by un-clipping the quick-disconnect and wired it up right to the battery. I started the truck and voila, i had about 12-14psi and the truck ran smooth. This pressure may be higher than the OEM because i have a Cummins lift pump installed. I then decided to keep the truck running and hook up a voltmeter to the lift pump plug at the harness end and watch the voltage. The voltage would fluctuate from 0volts to 8volts.
Where does this plug go in the wiring harness?
Where can I get a schematic with the wiring? I would like to trace it out and find out where the issue is. Any help would be appreciated.
#2
05-31-2011, 12:07 AM
It may be an issue with the oil pressure switch. I took a look at mine it has 2 terminals. The ones i have found online have 3 terminals. What is the part number for this oil pressure switch and where can i get one that has 2 terminals?
#6
06-06-2011, 09:48 PM
Does anyone have a wiring diagram for the 1995 6.5NA? I am trying to trace out my electrical issue with the lift pump. Once I figure it out I will post up my results and any information. Thank you guys.
-Pavel
-Pavel
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