1995 K2500 Chevy 6.5 Diesel *NO START*

[Monan]

I suspect it's a fuel issue. I crank and crank with no results. I checked the bleed line on the fuel filter and fuel comes out, I check the T-Valve and no fuel comes out with ignition on or while cranking however when I turn my key it does release a small amount of fuel for half a second.
Anything else I should check before I send this off to the mechanic? The thing ran fine until now, I've had no indications that anything was wrong until now. It was running just fine yesterday.
Thanks.

[rameye]

Fuel should be gushing out of that T-stat bleed line....verify pump is actually working.

[Monan]

I've checked the injector lines and they're not getting any fuel either. It's looking like a pump failure to me right now. How can I check to see if its working?

[kaylabryn]

I would bet you have a dead PMD. Just a guess due to the fact you said you have fuel prior to the pump but none after the pump.

Mike

[Monan]

I would bet you have a dead PMD. Just a guess due to the fact you said you have fuel prior to the pump but none after the pump.

Mike

Hi there, before I go buy a PMD to test and see if that's the problem I was wondering how I could hard wire my pump to see if it's operating or not. Is this even possible?

[moondoggie]

Good Day!

"...I was wondering how I could hard wire my pump to see if it's operating or not. Is this even possible?" Nope. If, however, you purchase a new PMD / FSD with an extender cable, you can't go wrong - PMD / FSD failures are common, so it's likely you'll need one some day anyway; at the very least, even if you never used the new one, you could get some of your money back here in the classifieds, eh? ;)

I do, however, wonder if the on-off fuel solenoid could maybe be not opening? I'd do some searching; I don't know how to troubleshoot this part. Be careful to be clear that you're looking for the on-off fuel solenoid (the one with one wire, on the front-top of the IP), NOT the fuel solenoid that controls the injection events (on the rear of the IP).

Blessings!

[tommac95]

Monan-
Suggest locate LiftPump and hotwire {or with ignition ON, engine OFF, put shift lever into Drive , turn key to START} to do 1) fuel pressure test , 2) fuel volume {delivery} test.

Also check OPS .

Did you just get fueled-up on last run home? If so maybe got bad load of fuel which badly clogged fuel filter.

The LP costs $100 , the high pressure FuelInjectionPump costs more like $1100.....
So insure a pressurized supply of clean diesel to the FIP before do much else.

P.S. the ignition switches on '95 year seem problemmatic.

[Monan]

thanks for the replies guys.
I did the test with the truck in D and turn the key with the T-valve open and it spits out fuel all the way to the battery. The flow seems very healthy. I'm on a mission right now to get a PMD to plug in to see if that may be the problem before I go and splurge on a IP.

[Monan]

Hey guys, just to conclude this thread the truck has started again and it was the PMD. Thanks for all your help gentlemen, muuuuch appreciated.

[twaddle]

Hi there,
Glad to hear you got the engine fired up and also found the cause of your troubles.

I would also recommend carrying a spare pmd, Just in case. The little devils can be unpredictable.

Jim

[Turbine Doc]

Easy lift pump test,

I was having some issues with mine found a way on OBD-II (maybe new info or not) to force the lift pump to run, I don't know if OBD-I has similar set up old gassers do which is what prompted me to look on my (2) 98 6.5's, Truck & Burb

Spade lug to connector, then jumper to hot, lift pump runs, also IIRC on OBD-I's is a way to jumper across the relay for run I just don't remember how it is done, but pics attached show the jumper for force run on OBD-II without pulling the relay.

[moondoggie]

Good Day!

Wow, that's gotta be some sort of record for me misreading a post. I'm telling him there's no way to hard-wire the IP injection-control solenoid, when he simply wants to know how to run the LP; I musta took an extra moron pill that day, eh? :confused:

REAL glad you got 'er running. :)



Blessings!
(signature in previous post)

[Turbine Doc]

Good Day!

Wow, that's gotta be some sort of record for me misreading a post. I'm telling him there's no way to hard-wire the IP injection-control solenoid, when he simply wants to know how to run the LP; I musta took an extra moron pill that day, eh? :confused:

REAL glad you got 'er running. :)



Blessings!
(signature in previous post)

No Moron pills as it is real easy to gloss over & missing info/context Doggie, how do I check pump isn't real definative; since we have 2 pump possibilites both answers wound up being covered, but I see where I jumped in with my pics tommac95 said sort of same thing I did, so I guess I must have gotten a dose myself.

[JohnC]

ODB 1 has a pin in the ALDL that's directly connected to the lift pump. The wire is red. Maybe the upper right???

[Turbine Doc]

Thanks for info John, does that ALDL jumper also require key on or just straight jump to gnd to energize the lift pump, also do you know if a connector is under hood like on the OBD-II, would make post filter change purges easier if you could tap in & toggle on lift pump rite at the filter itself

[twaddle]

I thought Monan was talking about the Injection pump too, as he was talking in relation to the PMD.

Don't think it was the moron pills after all!!!

Jim

[JohnC]

Tim:

You have to apply 12v to the ALDL pin (it's a red wire...) From there it's a straight shot to the pump. No relay or OPS.

AFAIK, no plug under the hood.

[Turbine Doc]

Thanks John I hit my 95 manual I don't spend much time in it owning 98s with OBD II

Pin G on DLC= Data Link Connector is the lift pump test jumper point for OBD-I vs the pigtail OBD-II has as shown in earlier pictures.

[Monan]

I was talking about the IP initially but alot of great info has risen because of my vagueness. Great info regardless that will certainly help someone out sometime.

[JohnC]

Pin G on DLC= Data Link Connector is the lift pump test jumper point for OBD-I

Musta been standing on my head when I figured it was upper right...