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Old 11-12-2012, 08:02 PM   #1 (permalink)
allsierra123
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Need help Weird stalling issue

This started about a week ago truck just died at cruising speed was able to restart it a few times ran about a mile and the same thing. Then it would not restart again. So I cranked on it a bit which killed my weak starter. So I replaced that and then I replaced the fuel filter. while I was diagnosing the issue I have good flow out the rubber hose for the the water separator. And I can here the lift pump running. I was thinking pmd i have it relocated in the front bumper nostril with a cooler. But in while I was diagnosing she fired up fun. And ran most of the week around town. This morning we hop in take off early in the AM about 70 miles out it just died. tried to restart it ran for a second and died again. tried to pour water on the pmd and the IP didnt make a different not to mention its 27* out so prolly not a big heat issue. Had it towed got home started checking everything and thinking about Everything I did last time. SO I unhooked the batteries let it sit for a while No start still not even a kick just cranking. So I opened up the fuel filter pulled it out put it back and it started right up. And continues to do so. I am kind of puzzled im not real experienced with this rig. So I dont even know where to start looking.

95 GMC yukon 2 Door.
6.5 TD 4L80E
3" exhaust S and B Intake.
PMD relocated to bumper nostril.
302,xxx miles.
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Old 11-12-2012, 08:08 PM   #2 (permalink)
SS force
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Sounds like a possible PMD issue. Based on how old that relocation kit is it could be your extension cable. I experienced similar issues with my truck where it would run fine for a while then die. No start several times then run fine again. Then it quit running entirely. Ended up being the extension cable. Being that thats an easy and free test I would start with that. Unhook the pmd from the front bumper and plug it in the the IP directly eliminating the extension harness. See if that changes anything. You could also have an air leak in your fuel line somewhere, however this issues seems a little too random to be that. Just my .02
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Old 11-12-2012, 08:14 PM   #3 (permalink)
allsierra123
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I was leaning towards pmd till today. As soon as it will die and not restart it will fire back up when I open up the fuel filter. It could be totally random. So I will try plugging it in without the extension cable. There is about 5000 miles on that cable and pmd since I relocated it.
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Old 11-12-2012, 08:22 PM   #4 (permalink)
SS force
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Try taking the gas cap off your tank. You might have a vacuum choking the motor.
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1997 chevy reg cab long bed 6.5l turbo diesel, HEATH gl4, HX35 swap and vacuum pump delete, 4'' diamond eye diesel straight pipe exhaust, 2 1/2 crossover pipe. K&N air filter,custom built cold air intake box, relocated pmd and #9 resistor mounted on frame behind skid plate, tranny, boost, and pyro guages. New 140 amp Delco Remy alternator and flex-a-lite dual electric fan conversion. 3'' body lift 6'' RCD suspension lift with billstien shocks, rebuilt tranny at 130k, shift kit and uprgraded torque converter, custum red LED interior dash lights, ALL L.E.D exterior and interior lighting, All 4 on headlight mod, New black and red custom embroidered interior, custom dual 12'' subwoofer box running 2 shallow pioneers driven by 1600 watt lightning audio amp and other speakers driven off 2nd 1600 watt amp. Home built ladder bars, runnin 37'' BFG KM2's on 20'' Moto Metal rims, new 4.56 gears and Grizzly Locker.
photo shoot Great Salt Lake UT May 2011 http://www.stephenwclark.com/p726278300
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Old 11-12-2012, 09:19 PM   #5 (permalink)
racer55
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When you open the fuel filter does air come out?
Could be OPS failing intermittently?
Recommend OPS relay mod and new AC Delco OPS:
OPS relay install
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Old 11-12-2012, 09:19 PM   #6 (permalink)
allsierra123
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Quote:
Originally Posted by SS force View Post
Try taking the gas cap off your tank. You might have a vacuum choking the motor.

Bad gas cap could cause the stalling issue?
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Old 11-12-2012, 09:28 PM   #7 (permalink)
racer55
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Diesel fuel caps are made to be vented to prevent excess pressure or vacuum in the tank.
They should be green or marked with a large D to identify them as diesel caps,they are often replaced with gasser caps incorrectly that do not vent under suction to allow air to take the place of spent fuel.

The vacuum can equalize with the LP's ability to pull fuel and nothing happens-no fuel flow,worse still is if the LP can pull more vacuum and the tank implodes.

High vacuum can also suck fuel back to the tank from the rest of the fuel system at shutdown and make the truck act like it ran out of fuel and sucked air when you restart.
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Last edited by racer55; 11-12-2012 at 09:30 PM.
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Old 11-13-2012, 01:26 AM   #8 (permalink)
allsierra123
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I didnt hear it let pressure out of the filter. But I have noticed a hissing from the fuel cap from time to time when I open it. I do Have an OPS I need to install. My gauge has a tendency to bounce. But It is I believe the original cap it says diesel fuel on it. Do they tend to go bad?
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Old 11-13-2012, 08:43 AM   #9 (permalink)
racer55
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They can over time get plugged or fail to vent.
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Old 11-13-2012, 10:11 AM   #10 (permalink)
JMJNet
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My burb has a bouncing fuel gauge also. It is not a reflection on whether you can start or not.

Bad fuel cap can become a cause of stalling issue but your issue seems to be either PMD or may be LP.

Try a KNOWN WORKING PMD. Note that Good Tested PMD may not be KNOWN WORKING PMD.
Also test the extension cable for the PMD.

Another reason may be air in the fuel system.
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Last edited by JMJNet; 11-13-2012 at 10:13 AM.
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