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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 02-10-2014, 12:11 PM   #11 (permalink)
racer55
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Google OPS relay mod or look at the FAQ-there is a reason it says look here first!


Also do not overlook the safety aspect the OPS plays,just because a hot wired LP will work does not mean you should do it that way-the BBQ you prevent may be your own.

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Old 02-10-2014, 12:23 PM   #12 (permalink)
Diesel-T
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Quote:
Originally Posted by racer55 View Post
Google OPS relay mod or look at the FAQ-there is a reason it says look here first!


Also do not overlook the safety aspect the OPS plays,just because a hot wired LP will work does not mean you should do it that way-the BBQ you prevent may be your own.
Suggestion to jumper the relay was for test purposes only .Hopefully not taken any other way

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Old 02-10-2014, 12:37 PM   #13 (permalink)
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Keep wondering about possibility of faulty (corroded) ecm-B fuse giving poor/ intermittent power to orange hot ? Wouldn't hurt to check/clean fuse contacts .Could also check the relay ground .
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Old 02-10-2014, 12:49 PM   #14 (permalink)
Tr00b
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I was super sick yesterday and didn't have a chance to check any of this out.

For SURE OPS circuit not needed for 96? I don't mean to be a dick but the info on this site is very difficult to dissect. It was a Borg Warner... would have had to wait till Monday for ACDelco. We need to have a sticky that properly shows the diff between the years...

The relay gets warm when the truck is running. That's the only thing I know ATM.

Thanks for the replies.
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1996 GMC K1500xcab 6.5 3.73 4L80E rear bags Bought at 99k 12/13 now 138k 9/17
Repairs:
BWD OPS 1/14 Heath PMD kit 3/14 Airtex boost solenoid 6/14 Lube Specialist cooler lines and cooler, rad support mounts, Pro Comp ES9000 Shocks, rear brakes 7/14 Interstate Batts, Cooper AT3 tires, Hummer H3 rims, stepper motor 4x4, coolant flush 11/14 Stabilizer bar links, soot trap gasket 9/15 Dorman tank, sending unit/sock delete, filler neck, filler neck, hose, Leroy's Tank Barbs, SAE30R9 lines, WIX filter head and prefilter with brackets by paleyjim, intake manifold gaskets 3/16 Used transmission, dipstick tube, fluid flush, drain plug pan by paleyjim, power steering fluid flush, transfer case seals and fluid 9/16 Duraterms 11/16 Ball Joints and wheel bearing drivers side. Powerstop pads, lubed sliders 4/17 AD244, Leroy's Flight Systems PMD 9/17
Performance:
Ashland Muffler 2.5 X-over 12/13 FTB FFM by paleyjim, ported upper egr delete S-code, lower F-code, ported IP fitting, FASS DRP-02 lift pump 3/16 Transgo Shift Kit by paleyjim, Energy Susp. engine+trans mounts 9/16 Ported GM8, Diamond Eye, Quadstar tune 11/16 K47 Box, Glowshift 3-1 1/17 Leroy's Billet Crank pulley, Fluidampr. 9/17
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Old 02-10-2014, 02:34 PM   #15 (permalink)
racer55
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Quote:
Originally Posted by Diesel-T View Post
Suggestion to jumper the relay was for test purposes only .Hopefully not taken any other way
Not taken that way,bud.

There are just so many posts about folks connecting the LP to a toggle full time that it concerns me,I would hate for anyone to ever be the victim of a fire due to something so easily taken care of eg:
https://www.dieselplace.com/forum/5291633-post32.html

One day an innocent victim will become a result and it may be from their very own family.
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Last edited by racer55; 02-10-2014 at 02:34 PM.
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Old 02-10-2014, 05:44 PM   #16 (permalink)
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Quote:
Originally Posted by Tr00b View Post
I was super sick yesterday and didn't have a chance to check any of this out.

For SURE OPS circuit not needed for 96? I don't mean to be a dick but the info on this site is very difficult to dissect. It was a Borg Warner... would have had to wait till Monday for ACDelco. We need to have a sticky that properly shows the diff between the years...

The relay gets warm when the truck is running. That's the only thing I know ATM.

Thanks for the replies.
Don't know if this will help or make things that much worse whether ops needed or no.

1996 & up

If your lift pump is activated with key in wait to start position the pump is fed via the pcm /relay,, and there is also a 2nd redundant parallel circuit through the relay & the ops . This is obdii & if pcm/relay circuit is functioning properly the pump should run without a functioning ops . Good to have functioning ops as a back up regardless

1994-95

Lift pump is activated in the crank position via the relay on crank & through the ops on run. This is obdi & as the ops circuit is the only circuit ,the ops is essential for the pump to run.

As 96 was a transition year some question as to which system involved for any particular vehicle .Can be sorted by noting whether pump runs with key in wait to start position, or in crank.

By way of explanation, I had only brought up the redundancy aspect of the obdii , as I had assumed your 96 was obdii,.Was just trying to say that even if ops not right, that wouldnt stop pump from running .

I would still be checking pump ground & relay ground as well as good voltage to & through relay & to pump.
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Old 02-10-2014, 05:50 PM   #17 (permalink)
racer55
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Quote:
Originally Posted by Diesel-T View Post
Don't know if this will help or make things that much worse whether ops needed or no.

1996 & up

If your lift pump is activated with key in wait to start position the pump is fed via the pcm /relay,, and there is also a 2nd redundant parallel circuit through the relay & the ops . This is obdii & if pcm/relay circuit is functioning properly the pump should run without a functioning ops . Good to have functioning ops as a back up regardless

1994-95

Lift pump is activated in the crank position via the relay on crank & through the ops on run. This is obdi & as the ops circuit is the only circuit ,the ops is essential for the pump to run.

As 96 was a transition year some question as to which system involved for any particular vehicle .Can be sorted by noting whether pump runs with key in wait to start position, or in crank.

By way of explanation, I had only brought up the redundancy aspect of the obdii , as I had assumed your 96 was obdii,.Was just trying to say that even if ops not right, that wouldnt stop pump from running .

I would still be checking pump ground & relay ground as well as good voltage to & through relay & to pump.
Very complete explanation.

There are exceptions to this but no exceptions to these rules in the domestic trucks.
Some buses and industrial and military carried on mechanical IP versions past 95.
Some buses even cam equipped with 5.9 cummins,as a side note.
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Old 02-10-2014, 05:50 PM   #18 (permalink)
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Racer Please correct as necessary
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Old 02-10-2014, 05:51 PM   #19 (permalink)
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Racer you got to post ahead of my pecking , Thanks
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Old 02-10-2014, 05:54 PM   #20 (permalink)
Freddyack
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Quote:
Originally Posted by Diesel-T View Post
Don't know if this will help or make things that much worse whether ops needed or no.

1996 & up

If your lift pump is activated with key in wait to start position the pump is fed via the pcm /relay,, and there is also a 2nd redundant parallel circuit through the relay & the ops . This is obdii & if pcm/relay circuit is functioning properly the pump should run without a functioning ops . Good to have functioning ops as a back up regardless

1994-95

Lift pump is activated in the crank position via the relay on crank & through the ops on run. This is obdi & as the ops circuit is the only circuit ,the ops is essential for the pump to run.

As 96 was a transition year some question as to which system involved for any particular vehicle .Can be sorted by noting whether pump runs with key in wait to start position, or in crank.

I would still be checking pump ground & relay ground as well as good voltage to & through relay & to pump.
Should ad this to the OPS section in the FAQ's

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Last edited by Freddyack; 02-10-2014 at 05:55 PM.
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