LLY FPR install

[WarWagon]

I don't know why all the other forums have you tear off 1/2 of the engine top to do this. :bs2: Maybe it is an early production LLY thing to avoid it?

First off, you do NOT have to drain the coolant and mess with the outlet tubes. Alternator and AC compressor stay in place.

For mine:
Remove the EGR intake crossover. This is the part that goes from the CAC tube across the EGR and down to the intake in the valley.
Remove the turbo 'mouthpiece'.
Remove the intake downpipe that has the two O-Rings.
Pull the fuel line, that is in the way, up and wire tire it out of the way - no disconnection needed for it.

Plug turbo inlet and intake inlet.

Clean the FPR with any good cleaner - brake clean or electronics cleaner and blow dry.

Put paper towels or newspaper around parts to keep tools and screws from going into the abyss of the engine valley.

Use a small piece of paper towel over the T25 bit to lock the screw to the bit during install of FPR screws.

Oil the orings and be careful what you use to pry the lower intake tube back on with.

Service the turbo mouthpiece with a better part (AFE, LBZ) if it is the original or machine it out.

Worst part of this is the 3rd FPR screw you can't see. Moving the fuel line makes it doable.

 

[DieselCash]

Nice wright up, sounds like fun. :thumbsup:

What is a FPR? What does it do?

 

[btfarm]

FPR=Fuel Pressure Regulator

 

[DieselCash]

FPR=Fuel Pressure Regulator

Thanks! :thumbsup:

 

[Dieseldad97]

Hey WarWagon, did you just clean the FPR or replace it? What symptoms were you seeing and did it help?

Thanks.

 

[WarWagon]

I was getting a surge at idle that you could feel and see on the tach. I checked the commanded and actual fuel rail pressure. The Actual was all over the place while commanded stayed steady.

 

[Dieseldad97]

So maybe I should be cleaning mine before buying a new one. Hmm. Did it solve your surging? How long did this take you?

Thanks.

 

[WarWagon]

I replaced it. Took an afternoon to do. The 3rd bolt is hard enough to justify replace it vs. clean it. Common failure as most of the Duramaxes my broker has also had this issue. One was from injectors leaking down at 250K miles. Yes, expensive part, but, I really would not want to do it twice in a row.

 

[Dieseldad97]

Thanks for the good info!

 

[treegump]

Did you clean it or replace it? If you cleaned it, were you successful, or did you end up changing it out for a new one?

 

[WarWagon]

IMO replace the fail prone part. However there is an advantage to cleaning the entire fuel system first if it gets you more injector life as injectors with high return rates can also cause this idle surge as well. I replaced it and problem, idle surge, went away - 110K miles and ~2800 hours on engine.

Cleaning can be done by a GM bulletin that involves disconnecting the fuel lines, using a "Do Not Put In Tank!" fuel cleaner in a bucket with 1/2 gal of diesel. You then run the engine with the return line going to the bucket for 30 min to an hour when it runs out of fuel. AC on high helps. This will clean injectors and the FPR along with the entire injection system. I dropped and cleaned the tank and ran the stuff through the fuel lines there. You will need quick disconnect tools to remove fuel lines.

http://duramaxdiesels.com/forum/show...t=36198&page=2
The new GM PART # is 88861803

 

[treegump]

Alright, thanks! I know you posted that link on my other post, but thought I'd at least clarify what you ended up doing on this post. Thanks again.