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Thread: Troubleshooting Lift Pump

  1. #11
    Join Date
    Feb 2007
    Posts
    2,926

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    They will start on 5 glow plugs, and run rough for half a minute, blowing white smoke then clatter with a big puff of black smoke. The vapour from the turbo is a mystery, the fuel getting into the oil could be from repeated attempts to start without the fuel being burned. With the engine stopped, it should only be possible to pressurize one injector from the lift pump, but the injector needs about 2300 psi to release the fuel. Any chance that the injector lines got dirt in them while apart, thus making them stick open.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  2. #12
    Join Date
    Mar 2009
    Location
    Folsom, CA
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    194

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    I cranked it over and over until now the ignition lock won’t turn off. So I’ll be replacing that before trying again. I made sure to clean the injector lines out before putting them back in. So I really hope dirt isn’t the issue. My goal was to get it running and change the oil anyway so I’m not too concerned about the fuel in the oil. The glow plugs visually appeared in decent shape so I reused them. It seems unlikely that three or more would have failed since I had last started the motor. As I cranked it was starting to stumble like it wanted to light so I think I’m on the right track. I’ll touch back after I get the ignition working again.
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  3. #13
    Join Date
    Feb 2007
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    2,926

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    My suburban's ignition barrel did the same, I had to pull the ECM fuse to stop the engine. You have to remove the steering wheel to get to the retaining bolt, a puller is needed, don't use long puller bolts, they will damage the indicator switch.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  4. #14
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

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    I got the ignition lock replaced and now is working like new (key can’t be removed while running). Engine still cranks great and will stumble like it want to light but doesn’t, it does shake a lot also. Don’t know if that’s a sign of something. Any thoughts?
    Last edited by CAdiesel; 07-28-2020 at 01:50 AM.
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  5. #15
    Join Date
    Feb 2007
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    2,926

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    The lock was really worn, it had too many keys swinging from it. The shaking could just be because of the limited number of cylinders firing. I can't image being able to run the injector lines to the wrong injector, without a lot of bending. Did you replace the engine mounts, they don't last well?
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  6. #16
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

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    I did replace the motor mounts and I’m really putting them to the test.
    The shaking does seem like a timing issue. It’s rough but consistent. Is it possible I need to do a TDC relearn? I didn’t touch the IP when the motor was out.
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  7. #17
    Join Date
    Feb 2007
    Posts
    2,926

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    Did you replace the timing chain, if not, there should be no reason for a TDC relearn. I replaced the IP on the GMC truck and it has been running fine with no relearn or adjustment, perhaps just lucky. When you removed the injector lines, did you leave them connected in pairs, that is what I do, and there is no way to connect them to the wrong place.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  8. #18
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

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    I only checked the timing chain tension when the oil pan was off. Seemed fine, not too much play, so I left it alone. I can’t imagine the glow plugs went bad while out of the truck. I was really careful with the injectors and lines, yes I kept them in pairs.
    I have black smoke out the tailpipe, if I crank long enough, so it seems I have fuel and air. I did hook and slightly bend two injector lines when I was lifting the motor out of the engine stand but they weren’t even visibly bent or dented so I. Ant imagine that is having any effect. I blew air back through the return lines, so they seem clear.

    I’m really at a loss here.

    I think tomorrow I’ll take a video of it cranking over and post it to YouTube.
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  9. #19
    Join Date
    Feb 2007
    Posts
    2,926

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    Did you change the lifters? New ones need to be primed. I had a customers pickup in the workshop once, for 3 weeks, and the lifters bled the oil out, it took a long time to start, then ran on a limited number of cylinders for quite a while.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  10. #20
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

    Default

    I did replace the lifters. I soaked them in clean oil for weeks while I was waiting for parts. But then half of them sat in the motor for a few more weeks while waiting for more parts. Is there a way of priming them now or do I need to pull the valve covers? I’m going to try to post a link to the YouTube video, if that helps.

    https://youtu.be/9gDYMtleZXE
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

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