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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 03-24-2020, 07:02 PM   #1 (permalink)
Bart Sheffield
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And problem

I have replaced 2 pmd in the last 6 months now working on my 3rd....what in the hell is making them go bad...I replace them...then check engine light comes back on in 50 miles and loose all throttle response for few seconds then comes back alive and then the light stays on..then 300 miles later...dead all over again....I'm about to toss this 6.5 in the Brazos River...

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Old 03-24-2020, 07:15 PM   #2 (permalink)
OkDually
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I relocated your post over to the 6.5L section.

When you have PMD issues you have fuel system issues ( Air in fuel, leaks, etc)..

Start by installing a piece of clear fuel line on the return side of the IP, as shown in this link:
https://www.dieselplace.com/forum/63...ml#post7305306
If you notice air bubbles in the line then you need to start hunting for the source.

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Last edited by OkDually; 03-24-2020 at 07:16 PM.
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Old 03-24-2020, 07:39 PM   #3 (permalink)
JMJNet
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Need more detail.

Where is the location of PMD?
Is it on a heatsink?
Which PMD brand are you using? Dorman can be pesky but others can be pesky also although not as bad as Dorman.
Have you done the proper diagnosis of the fuel system?
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Old 03-24-2020, 08:02 PM   #4 (permalink)
Bart Sheffield
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It new injection pump and everything pmd has been relocated its something just shorting them out put new one on bam..but only for so many miles....something is making them go out it's that simple.....
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Old 03-24-2020, 08:05 PM   #5 (permalink)
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Quote:
Originally Posted by Bart Sheffield View Post
It new injection pump and everything pmd has been relocated its something just shorting them out put new one on bam..but only for so many miles....something is making them go out it's that simple.....
Do a lift pump test...
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Quote:
Originally Posted by lindabenson View Post
I took it to a reputable diesel mechanic and he rebuilt the injection pump.
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Old 03-24-2020, 08:06 PM   #6 (permalink)
OkDually
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Quote:
Originally Posted by Bart Sheffield View Post
It new injection pump and everything pmd has been relocated its something just shorting them out put new one on bam..but only for so many miles....something is making them go out it's that simple.....
A PMD can last as little as 3 minutes or as long as 30 years...
Again, it depends on your fuel system health.
If you have any air intrusions or leaks, corroded fuel lines, etc will burn up the transistors inside the PMD
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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

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Old 03-24-2020, 08:14 PM   #7 (permalink)
Bart Sheffield
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So check to see if I have any air in the fuel line correct
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Old Yesterday, 10:08 AM   #8 (permalink)
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Quote:
Originally Posted by Bart Sheffield View Post
So check to see if I have any air in the fuel line correct
Yes. Fix your fuel leaks. That's how air gets in.

Make sure your fuel cap dosent do the woosh either. When you open it does it make a woosh sound?

Common leak spots;
Fuel filter housing / ffm - all hoses, heater and water in fuel sensor
Connection to injection pump
Injector return lines @ injectors
Return rail (if you have it) that runs under the intake.

Check the lift pump fittings (tho not a common spot)
Tank fittings can but is not common either

... unless you live in the rust belt or a high corrosion area...

hope this helps...
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I'll get back to this later...

Last edited by jnlperformance; Yesterday at 10:19 AM.
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Old Yesterday, 07:47 PM   #9 (permalink)
bk95td
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PMD relocated to where? and is it on a heat sink? Do you have the thermal pad between the PMD and heat sink? Where did you buy the extension harness?
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Old Today, 12:38 AM   #10 (permalink)
Tommygunner
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What trouble codes are you getting?

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