howdy, threw a post up here (https://www.dieselbombers.com/chevy-...t-no-fire.html) and back to square 1. burned through 4 or 5 PMD's since the last post, getting stuck in remote parts of the province. seems like below -15C the truck will spin but no fire until i throw a new pmd in and get some icy-hot packs on the ecm. lift pump pass, fuel to t valve, seems like shes trying to turn, got smoke but if she does catch its a 5-10 second stumble then ***** out. weve got some pretty nasty weather going on and hoping i can get the rig rocket up and stable before the next rotation. any info would be appreciated if anybodys had any symptoms like this.

 

You need to check the fuel flow at the bleed valve. Straight wire the lift pump, run a switch inside the truck so you can turn it on for diagnostic purposes. It also helps to bleed it when you run out of fuel

It should fill up a red solo cup under 30 seconds. If it is a weak stream then something is clogged. Let me know the results of this simple test.

 

yeah ive got flow on that side of the injection pump, believe shes got air or a blockage on my return line throwing on a t valve for the return line today, thanks though

 

There is flow, then there is adequate flow. If the fuel sock is clogged the stream will be weak, which stresses the injection pump, which in turn stresses the FSD. This causes short life spans in FSD's, and will also lead to fuel shutoffs due to air in the fuel lines.

A bad oil sending unit or failing lift pump will also cause these problems.

Sounds like you have a fuel delivery problem. You should also check the FFM for rust and other debris at the bottom.

 

You can also pull the fuel shut down solenoid, turn the lift pump on with your jumper - I always mount the on/off toggle switch for the lift pumps on my vehicles under the hood - flip the lift pump on for 1/2 second and see if you have good fuel to the Injection pump.

 

thanks for the responses, sorry haven't updated in a while. got fuel up to the IP ant the solenoid, swapped it out with a spare I've got as well. still no start, got smoke and seems like she wants to try still. got some good fuel pressure at FFM, clean in there new filter, good flow at t valve and shutoff solenoid port. either of you have any experience with dorman PMDs? seems like that's the only brand available in southern alberta and my next unit will be #6 in the last 2 months.

 

and heres the checklist just for ***** and giggles

- Year: 1996
- Truck model and class (ie: c2500) k2500
- Automatic or Standard standard
- Mileage: (indicate miles or km) 310000kms
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc) manual wastegate, manual glowplug switch
- Model: ‘S’ or ‘F’ engine, NA or Turbo, EGR? turbo F
- Ambient outside temp: (indicate *C or *F) negative holy **** (-20C)
- What fuel are you using? (#1 Diesel, #2 Diesel, Bio, VO, WVO, etc) dirty purple rig fuel
- What fuel additives are you using? generic conditioner
- Where are you located? alberta

General maintenance: inspect and evaluate the condition of each. When were they last changed?
- Air filter brand new
- Fuel filter brand new
- CDR Valve? cleaned, good
- Coolant – last flushed/replaced at unknown
- Oil – synthetic/regular, changed at synthetic @ 306000kms
- Batteries – state of charge, (matched set) replaced at june 2016, matched full charge
- Battery cables and grounds (removed, cleaned and tightened): clean and tight
- Glow Plugs - how many miles on them? 5000 What type? AC Delco
- Injectors - last changed at unknown


History: (Describe how the problem first appeared.)
- What were you doing when it happened? trying to start in morning
- How was the truck running fine before this problem appeared? perfect
- Has this problem ever happened before? yes, after 1 week of replacing previous pmd
- Describe any related factors that might be part of the problem.
- Have you checked for DTC (Diagnostic Trouble Codes)? (Y.N) yes And? po380 for GP circuit


Diagnostics:

1] Starting:
1a] Does the engine start? no
1b] Does the engine crank over? yes
1c] Are your batteries fully charged? yes
1d] Have you removed, cleaned, and tightened all battery connections?yes
1e] Does your Wait to Start light come on for a time? How long? Yes manual GP
1f] Does your glow plug light come on? _________ For how long? _________
1g] Do you see smoke from the exhaust while cranking? What color? slight grey/ black

2] Fuel Issues (if not running):
2a] Can you hear your lift pump working? yes
2b] Do you get a steady flow of fuel from the water drain (T-handle) ? yes
2c] Loosen the inlet line from the IP – is fuel coming out (Lift Pump on)?yes
2d] Loosen an injector line and crank the engine - does fuel come out? no
2e] Do you hear a vacuum (hiss) when you remove the fuel cap? yes ( i dont tighten down cap all the way because of this)

3] PMD / IP Issues
3a] Location of PMD (on pump, on intake, remote mounted) remote mounted @front bumper
3b] Condition of Extension harness (if used) Vendor or Homemade? good dorman
3c] Condition of grounds / ground wires to IP / PMD. Check Harness. IP and frame rail good
3d] PMD Make: dorman
3e] PMD Age: in truck 3 weeks( truck died 2 weeks ago)

4] Stalling Issues
4a] Do you experience stalling only when hot? nno
4b] Does it stall under particular circumstances? (ie hit bump, or on accel) no
4c] Does pouring cool water over the IP seem to help with restarting? _________
4d] Is stalling momentary (engine recovers)? _________
4e] Does SES light come on when engine hiccups? _________
4f] Does cruise control quit working when engine hiccups? ___________
4g] Does re-starting seem to reset engine, restoring cruise and power? _________
4h] Changes to dash lights or instruments during stalling events? ___________

5] Running Issues
5a] On cold start, does upper rad hose get hard before engine warms up? unknown
5b] Any bubbles or oil film in coolant overflow tank? no
5c] Any white slime on oil surfaces (dipstick, CDR, oil Fill cap)? no
5d] Excessive white smoke from exhaust on cold start? somewhat
5e] Excessive black smoke from exhaust under hard acceleration? somewhat

6] Performance Issues
6a] Do you have gauges? boost
6b] Maximum boost under load? 10 psi
6c] Have you added a performance PCM (reflash) or Chip? no
6d] Have you changed exhaust / downpipe / crossover? previous owner, poorly made downpipe
6e] Wastegate – mechanical or vacuum? mechanical
7] Temperature-related Issues:
7a] Single or dual thermostats? single
7b] Have you replaced them lately? Manufacturer of replacements? no
7c] Have you pulled and cleaned Radiator and coolers lately? no
7d] Have you replaced the fan clutch? Manufacturer of replacement? ________
7e] (winter) Have you tested your antifreeze? Good to what temp? no
7f] (winter) Are you using a winter grille cover? hasnt been running for long enough intervals to justify

 

Haven't heard much about the Dorman PMD's.

I would be more inclined to try a Flight Systems or the new PMD they have out that Has a different kind of resistor.

I would stay away from Dormans or Standyne Gray PMD's

IF all you have been using is Dorman's I would try something else. Usually PMD's going bad is a sign of something up with the fuel system.

I would install a fuel pressure gauge so you can monitor your fuel. If the guage is dropping to zero or below, you know you have a lift pump problem or a differnet reason the lift pump is not getting enough fuel