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Thread: Troubleshooting Lift Pump

  1. #21
    Join Date
    Feb 2007
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    2,926

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    A video won't help diagnose the problem. I think I used a syringe to fill the new lifters, but they have to be removed, that is a huge job. New or unworn lifters don't leak to a stage of not functioning. This seems to be the only cause of the problem, as the other alternatives have been eliminated. Are you seeing oil pressure while cranking? You may need to use a drill to spin the oil pump, to prime the galleries and the lifters. I am leaving the inlet manifold off, to be able to access the back of the engine to spin the oil pump, through the cam drive that stands up in the valley. That is a requirement for a new engine, immediately before starting, so it will run first with no inlet manifold.
    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. #22
    Join Date
    Mar 2009
    Location
    Folsom, CA
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    194

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    I spun the oil pump with the motor in the stand until oil came out the galleys toward the top of the opening. It didn’t look like it would come out the heads without the pump drive in place so I put it back together. Is it possible I did camshaft damage without the lifters properly primed? Plus, would that keep the engine from starting?
    Last edited by CAdiesel; 07-29-2020 at 06:07 PM.
    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. #23
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    Feb 2007
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    Ok, so you should have oil pressure, unless the non return on the oil filter was faulty, I have had that, and the engine runs a while before getting pressure. I replaced the filter in short time. The lack of an adapter for driving the oil pump with a drill, means no pressure to the upper galleries. The cam will be OK, and I think that the lack of oil in the lifters is preventing the engine from starting. All you can do is keep trying, if there is oil pressure, the lifters will eventually fill.
    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. #24
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

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    Thanks Grant, I’ll update with any new developments.
    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. #25
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

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    At this point I have cranked the motor to the point of having to charge the batteries several times and I don’t have any change. My next move is to pull the turbo off and bleed the two injectors under it to make sure they have fuel. Beside that I am out of ideas. I can’t for the life of me figure out why it turns over so rough. The way I see it it seems that the timing is way off. It seems so absurd that I ruled it out but is it even possible that it is cranking backwards?!
    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

  6. #26
    Join Date
    Feb 2007
    Posts
    2,926

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    It won't be cranking backwards unless you put a marine starter on it, designed for a counter rotating engine. I see no point in bleeding the last two lines, you have so much fuel not being burned, already. Are you getting oil pressure while cranking?
    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.

  7. #27
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

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    I figured it was really unlikely. It’s the same starter as before the repairs. 10-4 on the injectors. I do have oil pressure while cranking, gauge reads about 40 psi. Unless we’re missing something I feel like my next step is to pull the valve covers and see if they show us anything amiss. One point of note: my heads have different casting #s. The one that was on the truck is: 10137657. The new one (and that is all new: valves, springs, etc) is: 10137567. Is there any chance that is the cause? I’ve read that the 7567 might be a hummv head but I didn’t really have much trouble bolting anything up to it.
    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

  8. #28
    Join Date
    Feb 2007
    Posts
    2,926

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    I have not heard of head differences causing a problem. Big job to remove the rocker covers, but I can't think of why it won't start. I have run mine with the rocker covers off, it makes a mess from oil, but you could see if the valves are opening. If you have to remove the lifters, I can direct you to photos of the tools you need to make, they are here somewhere on the site, or I can send new photos.
    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.

  9. #29
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

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    Okay, Thanks Grant. Ill let you know what I find 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

  10. #30
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

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    I haven’t pulled the rocker covers yet. I’ve had to tend to other things. I did pull the ECM fuse to see what it would do without fuel. It turns over but not as rough as when it was getting fuel. Is it possible that my crank sensor is shot? I didn’t do anything to it except clean it off from the outside. (It had about 1/8” of dirt and oil on it, couldn’t even see the bolt).
    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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