Shuts off while driving - Stalling

**JohnC** · 04-13-2008, 10:34

My guess is that either a failing fuel solenoid or fuel solenoid driver blew the fuse. Now either the fuel solenoid is stuck, giving full fuel, or the FSD is shorted, doing the same. When the PCM sees the engine is running away it drops the fuel cutoff solenoid which causes the stall.

Check the fuel solenoid first by applying battery power directly to it after removing the wire from the FSD. If it clicks, the problem may be the FSD. I would not try a new FSD until you comfirm the solenoid is not shorted as it may kill the new FSD too.

**ronale** · 04-13-2008, 11:05

Fuel solenoid is tested, it clicks and no shortage measured.
A friend of mine has a known working FSD which I will try.
Will keep you posted.

**Robyn** · 04-13-2008, 18:15

Contrary to common belief the PMD can cause a runaway.
I was testing several PMD's on My dually to see if they were ok and one would consistently cause the runaway.

To be safe I would replace the fuel shutoff solenoid and the PMD and the issue should go away.

Once the shutoff drops with the engine still on (Blown fuse) the engine can run the fuel out of the pump causing a no fuel (air in pump) condition that will make for some erratic running for a little bit but is should not race.

The other issue could possibly be a bad fuel solenoid in the IP.
Before I went to thios length I would try the shutoff and the PMD first.

best

Robyn

**JohnC** · 04-14-2008, 09:51

Originally Posted by ronale

Fuel solenoid is tested, it clicks and no shortage measured.

Just to be sure, you checked the Fuel Solenoid, on the back of the pump burried amongst the injector lines, not the Fuel Cutoff Solenoid, on the top of the pump, right?

**ronale** · 04-14-2008, 12:30

Problem solved by swapping PMD. Engine is now running nice and easy.
To John:
I tested fuel cut off solenoid only since this is powered from the blown fuse together with the PMD.
I appreciate all help and suggestions.
I called a local dealer (Norway) for price of a new Stanadyne PMD . About $1300!!!! Asking if the price also included the IP, the answer was no.
Will try to find a dealer in the US, the Dtech PMD is maybe worth to try.
Thanks.

**JohnC** · 04-14-2008, 13:02

Glad you got to the bottom of it.

The reason I asked about the Fuel Solenoid is that it is what the Fuel Solenoid Driver drives. If it shorts or sticks it can overload the FSD and cause it to fail.

**ronale** · 04-14-2008, 14:13

I will check the fuel solenoid also just to be sure there is no leakage to chassis.
Do you know the resistance value of this coil?
Cannot afford the new PMD to break down.
The new PMD (not mounted to cooler yet) became pretty hot after a few minutes of running. This is maybe normal without cooler? I am trying do adapt this PMD to a cooler from my junk box.

**Bnave95** · 04-15-2008, 04:21

http://www.kennedydiesel.com/detail.cfm?ID=134
Once you have your FSD,Cooler set up, use a harness to install in a cooler area.

**enormiss** · 02-27-2009, 20:15

Hunting down a solution to my stalling.
Is there any changes over the years?
I see some fsd/pmd notations up to 99 and/or 01...
Is there any changes over the years or is a 6.5 a 6.5?
THANKS

**suburbanK-2500HD** · 02-27-2009, 22:33

Originally Posted by ronale

I will check the fuel solenoid also just to be sure there is no leakage to chassis.
Do you know the resistance value of this coil?
Cannot afford the new PMD to break down.
The new PMD (not mounted to cooler yet) became pretty hot after a few minutes of running. This is maybe normal without cooler? I am trying do adapt this PMD to a cooler from my junk box.

Hi (hallo)
I bought the PMD from a US dealer last summer and it works fine.
Look at the: http://www.thedieselpage.com/vendors/main.htm
Its almost insane prices i Norway for some parts.
The fuel cut off solenoid costs about 700usd in Norway..

**Robyn** · 02-28-2009, 07:41

The PMD is the achilles heel of the electronic 6.5.

The new aftermarket PMD by Dtech mounted on a remote cooler away from engine heat is the only solution.

Standayne made some running changes along the way as far as the PMD goes but its basically the same bill of goods.

The latest ones are the best but I am sold on the Dtech units as they were designed to handle more heat and if remote mounted seem to be great.

The Dtech Pmd can be purchased at such places as ebay.

best

Robyn

**enormiss** · 03-02-2009, 07:45

I should have worded my question better.
Is there any reason my 2002 would be different than than other 6.5's?
I just see mention of different cut off years, even the 6.5 thread lists up to 2000.
Just want to make sure I'm trouble shooting correctly

1992-00 6.5TD - Discussion forum for the 6.5L engine.

**Robyn** · 03-02-2009, 08:14

Same tune, just a different year is all.

Most folks dont realize thatn the 6.5 TD was made that late.

THE pickup and the Burbs were all done by 2000 except for a rare fitting.

You have an odd duck that was still fitted with the 6.5

Same stuff, same issues, same failures, same fix

Best

Robyn

**enormiss** · 03-02-2009, 10:20

Originally Posted by Robyn

You have an odd duck

You have no idea LOL
THANKS for the info

**Mathew Leonard** · 03-04-2010, 22:29

Chased a similar problem on my 94 6.5 c3500 for a fair while. Relocated PMD, replaced wire harness to PMD and monitored the vehicle forever. Check engine light would randomly come on with code 18 (optic sensor)and go into limp home mode or truck would just shut down.

I ended up pulling the pump and checking the optic sensor. Found there was a small split in the sheild linking the optic to the circuit board which was allowing diesel up into the circuit board. There is also an update on the sensor as the new version has extra support around the harness as it comes out of the circuit block. Obviously not the first time this has happened if they changed the design.

Originally was hesitant to check the sensor as I was told by many reputable 6.5t specialists and they stated they have never seen an optic sensor fail. You can replace them yourself, when you remove the top cover just remember to scribe a reference line into the mounting bore that the retainer sits on so you can put the sensor back in the same spot. Make sure everything is clean and be careful of the degree plate.

Mathew

**rtphillips370** · 05-10-2010, 20:17

Howdy Robyn and gang,

"I'm baacckk" lololol been enjoying my 1999 C3500 with the mods I learned from here a couple of years ago, at least till this past weekend. Driving her down the highway it bucked, stalled kicked etc till I let off of the gas, lit back up, then stalled etc. The usual as describerd by many members in the past twelve pages of this thread.

I replaced the PMD 4 years or so ago and it has less than 20K miles / maybe 100 hours at a guess on itas I only use it in the summer to pull my fifth wheel. Anyways, I have a FSD cooler and just ordered a new PMD and the 72" extention connector from Kennedy to replace what I think is the problem, a bad PMD.

My question is, once I install the FSD cooler with the new PMD and "if" the problem persists, what else would I look at? Truck has 167k miles now but only gets 2k of miles per year use at the most...

Thanks a head of time...

**Lug** · 07-20-2010, 13:50

Add another possible fix. 94 K2500 Suburban. At 55-60 mph Stalling out and then relighting by itself (for almost 100 miles) until speed was below 35 mph and then no relight on coast and wouldn't start at all. Ended up shotgunning a different fuel shutoff solenoid at it even though the coil was energizing and you could feel a click when the key was turned. Now it starts and runs.
Justin

Update: Spoke to soon. Went for a test drive this afternoon and it didn't even make it a block. So a funky fuel shut off solenoid was not my fix this time. Waiting on another pmd.
Justin

**Robyn** · 07-20-2010, 15:27

I have seen the stanadyne PMd's fail in less than 20K miles even when mounted on a cooler.

The DTECH PMD was designed to withstand a much higher operating temperature.

Relocating to a cool spot is the only way to fly but, the DTECH virtually eliminates the failure problems with the PMD.

Missy

**anp4god** · 09-21-2010, 22:08

Originally Posted by Robyn

I have seen the stanadyne PMd's fail in less than 20K miles even when mounted on a cooler.

The DTECH PMD was designed to withstand a much higher operating temperature.

Relocating to a cool spot is the only way to fly but, the DTECH virtually eliminates the failure problems with the PMD.

Missy

Does this apply to the new "bulletproof" grey stanadyne? (I just ordered one! Hope I didn't mess up!)

**Yukon6.2** · 09-22-2010, 07:34

Hi
I had a Dtec fail after very little use,it is in my tow truck which dosn't get used very much,probley less than 2000 miles.It was mounted on a remote heat sink.Looking back i believ that it had issues right out of the box.
Stanadyne had plenty of time to build a better PMD,but never bothered till a fairly reliable aftermarket one was avalible.
If you have a EFI pump,keep a spare PMD with you at all times.I'v only had my EFI truck for a little over a year and had trouble with both the stanadyne and the aftermaket PMD.
Take your chances with either,the time will come that you will have to replace it.
Thomas

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