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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 11-13-2015, 04:52 PM   #1 (permalink)
craigboblitt
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truck stalled and will not start

about two weeks ago I was driving my truck while it was low on fuel (bad idea I know) I gave it a decent amount of throttle and about a couple hundred feet down the road it died. I'm no newbie to this truck so I said ok no big deal it sucked air in the lines and needs to be primed so I call my buddy to bring me some fuel (just to be safe) and we began to bleed the system I have my lift pump on a switch so priming the system is easy. we primed it pretty good and try to start it and it wont start so we repeat the process (bleed it and crank for 30 seconds and wait 2 minutes) then repeat over and over again and we did this until the batteries died.

so I get it towed home and the next day I hook up my battery charger and bleed and try to start it a bunch of times and still the lines at the injectors are dry.

so I think maybe pmd (mine is relocated to inside the grill) so I bought a new one and swapped in the #9 resistor from the old one and have tried a bunch more times to start it with the new one and still its dry at the injectors.

so what should I try next?

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Old 11-13-2015, 05:51 PM   #2 (permalink)
JMJNet
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What procedure did you use to bleed it?
Did you jump the LP with 12V direct source or jump the relay to energize the LP?
Probably not since you said you run out of battery.
Never use the engine crank method to bleed!!! although that is what the manual tells you to do.

All the cruds inside the tank may have clogged the tank sock?

You need to fill the tank up not just 1 or 2 gallons.

The OPS and/or the LP may have become bad due to heat.

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Last edited by JMJNet; 11-13-2015 at 05:52 PM.
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Old 11-13-2015, 06:10 PM   #3 (permalink)
craigboblitt
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I have the lift pump run to a 12v toggle switch I bleed the system by turning it on and opening the t handle and let the fuel run into a water bottle until I see no bubbles I also open the knob on top of the fuel filter and let it run out until its clear.

It has a decent amount of fuel coming out with lp switched on enough to fill a 16.9 oz water bottle in about 10-15 seconds
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Old 11-13-2015, 06:31 PM   #4 (permalink)
JMJNet
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You need to bleed from the filter valve.

Remember, air goes up (filter valve) and water goes down (t-valve).

So, with the toggle switch turning on the LP, it still not starting?

Have the batteries been load tested after it went down?
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1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator

Last edited by JMJNet; 11-13-2015 at 06:32 PM.
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Old 11-13-2015, 06:45 PM   #5 (permalink)
craigboblitt
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I bleed it from the filter valve until it was clear.

Yes with the lift pump switched on it still has no fuel at all in the injector lines.

The batteries are pretty new but I still charged them over night and they turn the engine over pretty fast. have not tested them but they should be good
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Old 11-13-2015, 07:25 PM   #6 (permalink)
JMJNet
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The LP only bring the fuel to the Injector Pump (IP).
Then the IP needs to work to get it to the Injector.

Where did you get the PMD extension cable?
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1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator
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Old 11-13-2015, 07:25 PM   #7 (permalink)
JCDiesel
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Doubtful that your tanks sock plugged or filter is plugged. If you have flow and nothing to injectors I would point to electrical. Reinstall your working pmd and check your grounds over well. Check the ground wires on the top framerail by the starter, the ground at the firewall below the coolant tank and rear intake stud ground strap that runs down to the forementioned locations. Would be a good idea to check the pmd ground on the pump too. This is just my hunch. Your best bet would be to go through the accurate diesel checklist.
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Last edited by JCDiesel; 11-13-2015 at 07:30 PM.
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Old 11-13-2015, 08:13 PM   #8 (permalink)
craigboblitt
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I got the extension cable from advance auto parts.

I will check all my grounds when I get home
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Old 11-13-2015, 08:43 PM   #9 (permalink)
vstech
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Ahh, advance... Um, I'd plug the PMD directly into the short ip cable, and see if it works...
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Old 11-13-2015, 08:52 PM   #10 (permalink)
JMJNet
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I am very sure that the extension is chinese made with questionable quality.

x2 with VS to plug it directly to the original IP harness temporarily and see if you can start.

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1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator
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