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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 10-22-2017, 10:00 PM   #1 (permalink)
Farmer13
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1994 6.5 starts then dies will start back after few min.

I have a 1994 Chevy 3500 haven't had it long. It will start some days and run fine but then some days it will start and run for about 1 min then die like you turned it off. It won't start right back up but you can let it set for a few and most of the time it will start up then it may run fine and then it may just keep going dead.. I have changed the fuel filters, lift pump and checked the sock filter its also new. Any suggestion on witch way to go now. Thank you

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Old 10-22-2017, 10:15 PM   #2 (permalink)
OkDually
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Moved to 6.5L.......

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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
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Old 10-22-2017, 10:32 PM   #3 (permalink)
MrMarty51
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Quote:
Originally Posted by OkDually View Post
Moved to 6.5L.......
I do not think that is what He meant when He asked about which way to go.
Okay, Farmer, Have You ever installed a new PMD ?
if You have a spare I think trying the known good spare might be worth a try.
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Old 10-22-2017, 10:45 PM   #4 (permalink)
OkDually
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Welcome to DieselPlace,

1994- the lift pump relies on the OPS to power up the lift pump.
Change out your OPS and install the OPS relay mod listed in the FAQ section

You mentioned checking the sock filter. You also mentioned it was new.
When you replaced the tank sock did you install AC/Delco #TS 1012??
If not, you will need to replace that sock with the AC/Delco.
Aftermarket tank socks will not work in a 6.5L and will cause fuel restrictions.
When you open your fuel cap do you hear a large "Whoosh" sound?
If so then you need to modify the fuel cap for better venting.

As MrMarty51 mentioned, also try another "Known Working" PMD w/ resistor installed.

Go through all of your grounds.
Install a clear line on the return side of the IP to help look for air in fuel gremlins
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club


Last edited by OkDually; 10-22-2017 at 10:47 PM.
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Old 10-22-2017, 10:53 PM   #5 (permalink)
MrMarty51
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Thank You @OKDually for the heads up on the tank sock.
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Old 10-22-2017, 10:57 PM   #6 (permalink)
Farmer13
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Ok will ck on a new sock, and forgive me for what may be a dumb question if the oil pressure gauge on the dash seems to be working fine could the ops still be bad? sorry I'm a farmer not much of a mechanic
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Old 10-22-2017, 10:58 PM   #7 (permalink)
OkDually
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Quote:
Originally Posted by MrMarty51 View Post
Thank You @OKDually for the heads up on the tank sock.
You can study up on the issue by reading this thread..
https://www.dieselplace.com/forum/63-...ml#post6620705
__________________
1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 10-23-2017, 12:50 AM   #8 (permalink)
JMJNet
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Quote:
Originally Posted by Farmer13 View Post
Ok will ck on a new sock, and forgive me for what may be a dumb question if the oil pressure gauge on the dash seems to be working fine could the ops still be bad? sorry I'm a farmer not much of a mechanic
Yes, there are 2 parts in the OPS.
One to control the gauge and one to control the LP.
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Old 10-24-2017, 05:53 PM   #9 (permalink)
matuva
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Open the bleed valve of your fuel filter housing on top of engine to see if fuel is flooding when your engine is running. If not, your OPS is shot, or your lift pump - even new - is in trouble.

Though, I would vote for a faulty PMD, or extension if any.

my .02
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Last edited by matuva; 10-24-2017 at 05:59 PM.
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