What is the likely hood?

[poptopjr]

Looks like miscommunication, he thought I would have his PMD for testing for up to months.

And, your right I intentionaly asked if you were posting about my product because thats my SOP. If it was mine I don't want it to get out in a negitive way so Im proactive. I'll test a PMD before I send it back, mainly for my own knowlege.

Definitely a miscommunication. I will get with you about the exchange if it becomes necessary. After figuring out the lift pump issue (I may need a walbro), I am going to put the PMD on the trucks harness to rule that out.

Thanks for your help Leroy.

Keith

 

[NVW]

View attachment 36676

Is this the drain you are referring to?

If I should have full stream of fuel flowing from the above drain, I have a problem. If I open it to check for fuel flow the truck runs for a few seconds and then stalls. Off to test the lift pump.

Yes, that is the drain. Sounds like the LP is bad. Check for power to it with a DVM. It should have power during the glow cycle.

 

[Drago]

I know Leroy wants us to mount the PMD on the bumper behind the plate but the thought of driving thru a large puddle or heavy rain makes be question that. I recently checked both of mine and the screws were already rusting. I remounted them fins up on the wheel well, the 1500 NA has it mounted on the driver's side where the old intake "muffler" went. and the 3500 turbo has it mounted on the driver's side between the relay/fuse box and battery. no drilling needed bolt holes already there.

 

[poptopjr]

Ok, I believe I have a bad lift pump. I have voltage to the lift pump. I pulled the line from the out put side, pulled the fuel solenoid fuse, and cranked the truck for 15 seconds. From what I read I should have about 1/5 pint of flow per 15 seconds of cranking. I got some fuel but not much at all. So I'm thinking I have a bad lift pump.

I'm not going to put the PMD on the trucks harness until I get a new lift pump and try that.

If anyone has a better way to test the lift pump let me know, but I feel pretty sure it is no good. I've always heard it running during the glow cycle, so I just assumed it was good. Probably been bad for a long time.

Thanks for all the help.

 

[poptopjr]

I know Leroy wants us to mount the PMD on the bumper behind the plate but the thought of driving thru a large puddle or heavy rain makes be question that. I recently checked both of mine and the screws were already rusting. I remounted them fins up on the wheel well, the 1500 NA has it mounted on the driver's side where the old intake "muffler" went. and the 3500 turbo has it mounted on the driver's side between the relay/fuse box and battery. no drilling needed bolt holes already there.

Mine is mounted right where Leroy recommends. One of the reasons I chose his over Bill Heath was mounting location. Heath wants it on the outside of the skid plate. He's been doing it a long time, but I couldn't get past that. I figured the bumper gave at least some protection. It does get wet, but when I pulled the plug the other day it seemed to be sealed up pretty good. I believe the connector is water proof or at least resistant. Either way it does have a seal in it.

 

[poptopjr]

Two posts above, the amount of flow should be 1/2 a pint, not 1/5 pint. I couldn't figure out how to edit the post.

 

[NVW]

One other possibility is a plugged tank sock. You could remove the fuel cap and blow air back to the tank to see if it clears.

 

[Burning oil]

Try what Leo said, blow air to clear sock. If that works the problem will come back as the sock gets covered in slime or ???
Im betting your LP is just wasted though.

As far as PMD location, I really don't care as long as its outside the engine bay. Behind one of the turnsignals outside core support is a good spot too, but depending on what you hit in a wreck could be less protected there than behind the bumper and, if you get hit hard enough to destoy the PMD in the bumper your probably calling a wrecker anyway??

 

[ak diesel driver]

If the sock isn't plugged be forewarned that a truck that won't run without a LP means the IP is getting old or that the extra strain of LP not working is taking out the IP

 

[JiFaire]

Ok, I believe I have a bad lift pump. I have voltage to the lift pump. I pulled the line from the out put side, pulled the fuel solenoid fuse, and cranked the truck for 15 seconds. From what I read I should have about 1/5 pint of flow per 15 seconds of cranking. I got some fuel but not much at all. So I'm thinking I have a bad lift pump.

I'm not going to put the PMD on the trucks harness until I get a new lift pump and try that.

If anyone has a better way to test the lift pump let me know, but I feel pretty sure it is no good. I've always heard it running during the glow cycle, so I just assumed it was good. Probably been bad for a long time.

Thanks for all the help.

Static flow test: start the truck, let it idle, and open up the water drain (brass T-handle). If engine stalls, your LP is not keeping up.

WOT pressure test: attach a gauge to the water drain with about 6' of hose... Open the drain so the gauge shows pressure. Run the gauge out of the hood, tape it to a wiper so you can read it while you drive. You should never have 0 pressure, even at WOT.

 

[Paveltolz]

If anyone has a better way to test the lift pump let me know, but I feel pretty sure it is no good.

After doing as suggested, to push air back down the line to the tank to ensure the sock is clean, apply 12v to the LP test circuit to run the pump without going to key on to see if it will run. Between the firewall and the underhood fuse box you will see a bare male spade in a black plastic connector attached to a red wire. I'd take a picture but I'm down for the night. Use a short wire to apply the 12V from one of the auxilliary terminals at the fuse box to the spade and you will hear the LP running or not. You'll know what to do next depending on the results.

Heath wants it on the outside of the skid plate. He's been doing it a long time, but I couldn't get past that. I figured the bumper gave at least some protection. It does get wet, but when I pulled the plug the other day it seemed to be sealed up pretty good. I believe the connector is water proof or at least resistant. Either way it does have a seal in it.

Can't really go wrong either way.
My Heath unit is mounted on the splash gaurd/skidplate and I actively seek puddles, snowbanks, slush, sand and salt to drive on without issue. To be sure, I put a bead of silicon around the outside edge of the PMD after tightening everything down. No issues.


Before going with the Heath unit, I had an SSD heatsink mounted behind the lisence plate on the bumper with one of Leroy's cables. I didn't use any silicon on that set up and never had a problem either. The SSD unit now sits on a buddy's truck in the same location without silicon and without issue for the last two winters. No problems.

 

[tanman_2006]

I want that tread plate skid... I'm jealous.

 

[Tookie]

Your truck will run without the lift pump, but it can prematurely wear the IP...
also if you have any tiny leaks between the LP and IP, you could suck in air.
Not saying you don't also need a lift pump, but your symptoms point to a
failing FSD... it's possible that running it with a loose ground put too much
current thru it and fried it, IDK.

Good Luck

 

[Tookie]

OK, so not tring to be a turd, but what would be "unreasonable" if I were to confirm a PMD is bad by testing on my truck?

Not giving you a hard time, I have heard a lot of good things about your services.
But if he had a completely failed unit, testing it on your truck would be reasonable....
if it's intermittent, it may be 3 or 4 weeks before the problem showed up again, and
he'd be without a truck all that time... at least, that's what it sounded like.

 

[Burning oil]

You might get that impression from this thread, but at the time he did not express the consern, so it never entered my mind he was thinking that.
Also, what you "think" is a failed PMD on one truck may actually not be. It could be a misdiagnois and a perfect PMD. As I said his symtoms do seem like a failing PMD and if he needs to warranty it then I'll help him out.

Anyway Im over it and poptopjr is too. Any update on the LP?