No start - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 18 (permalink) Old 11-22-2019, 11:28 AM Thread Starter
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No start

I have a neighbor with a 2002 duramax. It is with out any modification. The engine would spin with no start. Bled the fuel filter. Took several pumps to bleed. Truck started up and no problems for several days. Then it did the same thing. No leaks at all. What would be causing it to loose prime?

2008 LT1 crew cab
completely stock for now
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post #2 of 18 (permalink) Old 11-22-2019, 11:31 AM
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Probably has a slight air leak letting the fuel return to the fuel tank. Good possibility it just needs a filter head rebuild. Pretty easy job and an inexpensive place to start off

Name: Matt
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post #3 of 18 (permalink) Old 11-22-2019, 12:31 PM
J83
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Originally Posted by Bama1 View Post
I have a neighbor with a 2002 duramax. It is with out any modification. The engine would spin with no start. Bled the fuel filter. Took several pumps to bleed. Truck started up and no problems for several days. Then it did the same thing. No leaks at all. What would be causing it to loose prime?

likely the filter head needs to be rebuilt. There is a check valve that prevents fuel from returning to the tank keeping the fuel line primed. When that leaks fuel returns to the tank, and the line empties.

Its about a 50$ difference to buy a new head vs rebuilding the old. Personally i would rather buy the new one and be done, but both options will likely fix your issue.

2015 Chevy Silverado 2500 HD 6.6L LML
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post #4 of 18 (permalink) Old 11-22-2019, 01:29 PM
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likely the filter head needs to be rebuilt. There is a check valve that prevents fuel from returning to the tank keeping the fuel line primed. When that leaks fuel returns to the tank, and the line empties.

Its about a 50$ difference to buy a new head vs rebuilding the old. Personally i would rather buy the new one and be done, but both options will likely fix your issue.
Its a bit more than a $50 difference. The rebuild kit from Merchant Auto is $19.99 whereas a new filter head, for an LLY because they don't offer one for an LB7 any longer (and when it was available, the LB7 part was much more expensive), is $199.95 So there is a bit of a difference in price between them. And rebuilding one only takes a few minutes, so there isn't much of a time saving element there either

Name: Matt
ASE Certified, former GM Parts guy
John Deere Service Manager

Play Truck - 2002 LB7 2500HD Crew Cab Short Bed
Daily/Tow Rig - 2006 LLZ 2500HD Crew Cab Short Bed

SOLD - 2007 LBZ 2500HD Standard Cab Long Bed
SOLD - 2006 LBZ 2500HD Crew Cab Short Bed
SOLD - 2004 LLY 2500HD Crew Cab Long Bed
TRADED - 2002 2500HD Crew Cab Long Bed
SOLD - 2001 2500HD Ext. Cab Long Bed
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post #5 of 18 (permalink) Old 11-22-2019, 01:54 PM
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Originally Posted by DMAXfirefighter View Post
Its a bit more than a $50 difference. The rebuild kit from Merchant Auto is $19.99 whereas a new filter head, for an LLY because they don't offer one for an LB7 any longer (and when it was available, the LB7 part was much more expensive), is $199.95 So there is a bit of a difference in price between them. And rebuilding one only takes a few minutes, so there isn't much of a time saving element there either
Oh i didn't realize they were that expensive for that truck. I picked one up for my truck (its an older filter not an LML filter) and it came with the filter and head for about 120$

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Last edited by J83; 11-22-2019 at 01:58 PM.
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post #6 of 18 (permalink) Old 11-22-2019, 02:10 PM
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whereas a new filter head, for an LLY because they don't offer one for an LB7 any longer (and when it was available, the LB7 part was much more expensive), is $199.95
Nah, not anymore. They're available from a variety of mfrs and at a reasonable price comparable to the later version.

I don't think the LLY-LMM filter heads were ever $200. Last one I bought several years ago, was on a Saturday and from the Dealer parts counter...$125.

And that's for a full assembly; the head, new filter, new heater, new WIF sensor...not just the filter head alone. Just the head now, can be found for $75-ish.

The only difference between the two head designs is the angle of one of the tubes, which the newer design can be adapted to fit on the LB7 by replacing the fuel lines with 1/2" bulk fuel line.

Which should be replaced anyway, when the filter head ages enough to start leaking prime, and could also be the leak source from those two lines and not the seals in the filter head.

(Note; not all seals are serviceable in the filter head with the rebuild kit....there's a possibility that after a rebuild, it'll still leak. But many times it is one of the 6 seals in the kit that is leaking.

Roll the dice.

As old as it is, it's unlikely that it still has the original head on it anyway....but it's possible.

Another note;
Parker-Racor made those old original filter heads and you can still buy 'em today, from various sources.
Racor PFF4245R2-04
Pics in this link, difference between the two seen.
https://www.parker.com/Literature/Ra...F4245R2-04.pdf

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"

Last edited by Hook'em_Horns!; 11-22-2019 at 02:15 PM.
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post #7 of 18 (permalink) Old 11-22-2019, 03:01 PM
J83
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Originally Posted by Hook'em_Horns! View Post
Nah, not anymore. They're available from a variety of mfrs and at a reasonable price comparable to the later version.

I don't think the LLY-LMM filter heads were ever $200. Last one I bought several years ago, was on a Saturday and from the Dealer parts counter...$125.

And that's for a full assembly; the head, new filter, new heater, new WIF sensor...not just the filter head alone. Just the head now, can be found for $75-ish.

The only difference between the two head designs is the angle of one of the tubes, which the newer design can be adapted to fit on the LB7 by replacing the fuel lines with 1/2" bulk fuel line.

Which should be replaced anyway, when the filter head ages enough to start leaking prime, and could also be the leak source from those two lines and not the seals in the filter head.

(Note; not all seals are serviceable in the filter head with the rebuild kit....there's a possibility that after a rebuild, it'll still leak. But many times it is one of the 6 seals in the kit that is leaking.

Roll the dice.

As old as it is, it's unlikely that it still has the original head on it anyway....but it's possible.

Another note;
Parker-Racor made those old original filter heads and you can still buy 'em today, from various sources.
Racor PFF4245R2-04
Pics in this link, difference between the two seen.
https://www.parker.com/Literature/Ra...F4245R2-04.pdf


^^ that looks like the same filter head setup i got on amazon for my truck not too long ago. think i paid about 120 or so for the whole thing, head, wif and filter.

2015 Chevy Silverado 2500 HD 6.6L LML
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post #8 of 18 (permalink) Old 11-23-2019, 06:40 AM Thread Starter
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Thanks for the quick replies. Giving him this information and him not to mechanical, he's getting new head.

2008 LT1 crew cab
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post #9 of 18 (permalink) Old 11-23-2019, 06:44 AM
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he's getting new head.

Nothing ever wrong with that.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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post #10 of 18 (permalink) Old 11-23-2019, 06:52 AM
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Quote:
Originally Posted by Hook'em_Horns! View Post
Nah, not anymore. They're available from a variety of mfrs and at a reasonable price comparable to the later version.

I don't think the LLY-LMM filter heads were ever $200. Last one I bought several years ago, was on a Saturday and from the Dealer parts counter...$125.

And that's for a full assembly; the head, new filter, new heater, new WIF sensor...not just the filter head alone. Just the head now, can be found for $75-ish.

The only difference between the two head designs is the angle of one of the tubes, which the newer design can be adapted to fit on the LB7 by replacing the fuel lines with 1/2" bulk fuel line.

Which should be replaced anyway, when the filter head ages enough to start leaking prime, and could also be the leak source from those two lines and not the seals in the filter head.

(Note; not all seals are serviceable in the filter head with the rebuild kit....there's a possibility that after a rebuild, it'll still leak. But many times it is one of the 6 seals in the kit that is leaking.

Roll the dice.

As old as it is, it's unlikely that it still has the original head on it anyway....but it's possible.

Another note;
Parker-Racor made those old original filter heads and you can still buy 'em today, from various sources.
Racor PFF4245R2-04
Pics in this link, difference between the two seen.
https://www.parker.com/Literature/Ra...F4245R2-04.pdf
They were much more than 200 bucks from a dealer when I worked there, and they are 199.95 right now on Merchant Auto's site. So yes, they have been that price in the past. Not saying they are still that expensive, but I doubt they are cheaper at the dealer than on Merchant's site.

I didn't go looking on amazon for how cheap I could get it, I went straight to someplace that I knew would show me a price and have it available...

Name: Matt
ASE Certified, former GM Parts guy
John Deere Service Manager

Play Truck - 2002 LB7 2500HD Crew Cab Short Bed
Daily/Tow Rig - 2006 LLZ 2500HD Crew Cab Short Bed

SOLD - 2007 LBZ 2500HD Standard Cab Long Bed
SOLD - 2006 LBZ 2500HD Crew Cab Short Bed
SOLD - 2004 LLY 2500HD Crew Cab Long Bed
TRADED - 2002 2500HD Crew Cab Long Bed
SOLD - 2001 2500HD Ext. Cab Long Bed
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