Need Help ASAP! Fuel pressure issue - Chevy and GMC Duramax Diesel Forum

04.5-05 LLY 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.

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 11-19-2012, 05:32 PM Thread Starter
 
Join Date: Nov 2012
Posts: 8
Need Help ASAP! Fuel pressure issue

Here is what I have done. Have 05 Durmax with 206k. I have changed the fuel filter housing, filter, (whole unit) and the two hoses that are connected to it. I also flushed the fuel cooler and the fuel likne go back to the tank and cooler with air.

Here is the problem: I am trying to leaving with the Fifth Wheel tomorrow at 6pm central.

When driving with no load over 68 or 50 with a heavy load I lose power and can only do 66 with no laod or 35 with the load. I would say it feels like it is not getting enough fuel.

I had a friend use a GM computer to pressure test the fuel system. When the pressure gets to 160 MPA it bogs then the test defaults. It will not get over 160.

Thanks for the help
Duckslayer21 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 11-19-2012, 05:35 PM
Vanned this place
 
TheStepChild's Avatar
 
Join Date: Feb 2010
Location: Michigan
Posts: 8,123
Moved to lly area

Quote:
Originally Posted by Jeremy Clarkson View Post
Some say he was conceived in a cargo van
TheStepChild is offline  
post #3 of 8 (permalink) Old 11-19-2012, 05:37 PM Thread Starter
 
Join Date: Nov 2012
Posts: 8
ok.
Duckslayer21 is offline  
post #4 of 8 (permalink) Old 11-19-2012, 10:09 PM
 
varaho_69's Avatar
 
Join Date: Aug 2010
Posts: 9
I had the same prob with my 05, the prob with mine was the fuel pressure release valve. I replaced it with what they call a race valve (plug) and have not had a minutes problem since.

2005 GMC 2500 LLY
varaho_69 is offline  
post #5 of 8 (permalink) Old 11-20-2012, 04:27 AM
DuramaxForum Fanatic
 
Join Date: Sep 2010
Location: Maritimes, Canada
Posts: 5,742
Bottle test it right away (at 160 MPA) and shim it if it's leaking.

2005 Silverado EC/SB, LLY, 4WD, EFI DSP5 V2 (Idaho Rob at ATP), Edge CTS w/ EGT probe, LML Exhaust Manifold, PPE shimmed FPRV, Banks LBZ air cleaner, Profab intake, LBZ Turbo Mouthpiece, Kennedy twin lift pumps w/ megafilter, Corsa 304 SS Exhaust, Mike L tranny cooler, EXAXT Steering System, Redhead Power Steering Box w/ Amsoil PS fluid, Green Torsion Keys, Allison Deep Pan w/ Suncoast Filterlock and Transynd ATF, Bilstein 5100's (Norcal), Cognito UCA's, 17" NBS alloy rims, 265/70R17 Michelin LTX M/S2's, Pioneer AVH-P3200BT, CubbyCam Backup Camera, Pop & Lock Power Tailgate Lock, Extang Solid Fold Tonneau Cover, Tekonsha P3 Brake controller, Alphatherm AT-38OD Washer Fluid Heater
MTL_Dmax is offline  
post #6 of 8 (permalink) Old 11-20-2012, 07:03 AM
Administrator
 
jc1843's Avatar
 
Join Date: Jun 2008
Location: So. Cal
Posts: 15,309
Send a message via AIM to jc1843
Here is some info on the "Bottle Test".

On the drivers side fuel rail-- to the back and next to the Turbo, you will see a "U"
shaped 3/8 hose-- remove the hose from the fuel rail-- and plug the hose.

Now attach a 3/8 hose to the fuel rail nipple, and stick the end in a bottle. Now drive the truck hard-- with several wide open runs-- if there is any fuel in the bottle the FPRV [fuel pressure relief valve] is leaking main pressure from the fuel system.

The FPRV is a plug looking part that screws in the back of the driver's fuel rail. Many just increase the pressure with a couple washers, to help hole the pressure. Others use a "Race" plug [not recommended] available from supporting vendors.

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
jc1843 is offline  
post #7 of 8 (permalink) Old 11-23-2012, 05:02 AM
DuramaxForum Veteran
 
poosniffer's Avatar
 
Join Date: Oct 2011
Location: Vermont
Posts: 1,027
This is good info.Thanks jc1843.

2008 LMM Silverado 2500 LTZ ECSB 4X4.
Aftermarket DSP5 calibration by Danville Performance, Blocked and re-routed, Nicktane with Baldwin BF7587, PPE lift pump with Baldwin BF1212 water separator, 285/75/17 Dura Grapplers on H2s, CTS Insight with pyro.HIDs in fogs and high beams.

Proud Member U/A Local 693 Plumbers/Pipefitters.
poosniffer is offline  
post #8 of 8 (permalink) Old 11-23-2012, 05:05 PM
Junior Member
 
Join Date: May 2008
Location: Alberta/Arizona
Posts: 76
If it limped the engine... 66 mph in high gear at 2000 RPM, it will have a code.

Read that code. If you have restarted the truck, the code maybe in historical code storage. Takes a good code reader to see the non current codes. But they are as critical as current codes.

Let us know what code it has. With out the code it is a crap shot to diagnose. And you don't want to waste money on a guess. The above suggestions are valid if that happens to be the problem. But there are a dozen or more reasons why it will limp. Code first, then diagnostic charts, then step through the repair steps.... maybe quick/easy or more complicated.

Turnpike

'05 Chev, 2500HD, CC, SB, Duramax, Allison, 4WD, bought new April '05-times up - off warranty, now 120,000 miles, LBZ mouthpeice, Blocker Plate & Unplugged EGR, Air Box cut out, lost the cat, 52 US Gal (196 Litre) Titan Fuel Tank, SuperChips tuner on Tow mode, AirLift air bags, BrakeSmart Trailer Brake controller, PaceEdwards cover, DSP Fifth Hitch, JVC KW-NT1 headunit, "AutoEnginuity" scanner/reader/monitor.
turnpike is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome