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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 10-07-2019, 09:24 PM   #1 (permalink)
smdk2500
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Join Date: Apr 2019
Location: Nebraska
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Lift pump

This question is for the guys running the stock lift pump. Can you hear it running when the engine is running? I think mine is not working properly. I keep forgetting to bring my DVOM home from work to check for power. I installed leroys lift pump harness this weekend with the WTS option. When the glow plugs are getting power I can hear it running but with the engine running I can't. I'm trying to replace the OPS due to it possibly being bad. And with the reputation they have I figured it wont hurt. Apparently superman or steroid stan installed the nuts holding the glow plug relay to the intake and with what I have at home i couldn't break them loose.

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1995 K2500 ECLB 6.5
Diamond Eye turbo back
4.10
PMD in bumper
Stainless braided Oil cooler lines
S&B air intake
Leroys Lift pump harness
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Old 10-07-2019, 10:33 PM   #2 (permalink)
57diesel
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I would say in general I don't hear the lift pump with the engine running. Maybe after the engine is warmed up and less clacky and I'm on hard pavement vs grass and I am listening for it maybe.



Different pumps make different levels of noise depending on the pressures they are working with so that could effect the sound. I just changed mine yesterday and the old one was kinda noisy all the time except for when I think it was maybe stuck. The new one is almost silent once it builds pressure and the engine not running.



I would think you will be in good shape with that harness and a new sensor.

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Old 10-07-2019, 10:47 PM   #3 (permalink)
smdk2500
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Ok I was thinking that after it had primed the line so to say it shouldn't be heard much. Im hoping that I can get my sensor swapped tomorrow for piece of mind. And im hoping that it is bad or intermittently working and is what is causing my what seems to be a missfire feeling when under half to heavy throttle.
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1995 K2500 ECLB 6.5
Diamond Eye turbo back
4.10
PMD in bumper
Stainless braided Oil cooler lines
S&B air intake
Leroys Lift pump harness
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Old 10-08-2019, 12:11 AM   #4 (permalink)
JMJNet
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Just make sure the OPS is ACDelco and not store brand aftermarket.

What you describe is normal.
You need to test it when engine is running, you can direct the hose of the t-valve into a bottle and open the t-valve.
If fuel is flowing out, then you are good.
You should get about 1L per minute.
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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; 10-08-2019 at 12:12 AM.
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Old 10-08-2019, 07:43 PM   #5 (permalink)
smdk2500
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Quote:
Originally Posted by JMJNet View Post
Just make sure the OPS is ACDelco and not store brand aftermarket.

What you describe is normal.
You need to test it when engine is running, you can direct the hose of the t-valve into a bottle and open the t-valve.
If fuel is flowing out, then you are good.
You should get about 1L per minute.
Finally got it changed and i used a ac delco. Took longer then I wanted but having a back that has muscles that like to spasm when being bent over i got it. As for testing it how far do you open the valve? Before I changed the OPS i opened the valve 3-4 turns and it stalled. That is how far I had to open it before any fuel came out. Is that to far of about right.
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1995 K2500 ECLB 6.5
Diamond Eye turbo back
4.10
PMD in bumper
Stainless braided Oil cooler lines
S&B air intake
Leroys Lift pump harness
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Old 10-09-2019, 09:41 PM   #6 (permalink)
JMJNet
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Seriously, I have never paid attention to how far the valve have to be opened.
Till there is fuel come out. LOL!!!

Engine is engineering invention, it was made with tolerances not exact scientific measurement.
So, the valve is no different especially on a part that just have to be functional non mechanical to run the engine.
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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; 10-09-2019 at 09:42 PM.
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Old 10-09-2019, 11:24 PM   #7 (permalink)
smdk2500
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Location: Nebraska
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Quote:
Originally Posted by JMJNet View Post
Seriously, I have never paid attention to how far the valve have to be opened.
Till there is fuel come out. LOL!!!

Engine is engineering invention, it was made with tolerances not exact scientific measurement.
So, the valve is no different especially on a part that just have to be functional non mechanical to run the engine.
Yeah i figured there wasn't a set number of turns. Drove it to work today and it seems to be better. Didn't have the misfire like problem that I have been having but it didn't always do it so time will tell.
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1995 K2500 ECLB 6.5
Diamond Eye turbo back
4.10
PMD in bumper
Stainless braided Oil cooler lines
S&B air intake
Leroys Lift pump harness
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Old 10-09-2019, 11:47 PM   #8 (permalink)
JMJNet
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Location: Richardson, TX
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The Suburban Club Member

Yes, drive it for a few days.
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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 10-10-2019, 10:14 AM   #9 (permalink)
jnlperformance
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I got up under the truck while it was running, used a metal rod and stuck it to the lp housing. Ear on the other end. It was running.

Cant hear it while the engine is on. No. Way.
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Old 10-11-2019, 11:57 AM   #10 (permalink)
johnH123
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I can hear mine run if i stand in just the right spot in relation to the truck and listen carefully. I have a delphi LP so it may be louder then the delco.

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