Losing rail pressure/ losing power - Chevy and GMC Duramax Diesel Forum

06-07 LBZ & 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.

 
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post #1 of 6 (permalink) Old 12-07-2012, 08:54 PM Thread Starter
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Losing rail pressure/ losing power

Driving on the interstate from work tonight and cruise set on 70 the truck started slowing down and had very minimal power... Rail pressure was fluctuating between 900psi- 7800psi... I floored it and it would show 14,000 then start dropping down to 7k then 4k to around 900 them jump back to 8k before cruising fine and starting all over again... Finally made it to the house and as I was pulling in the driveway it dropped to 700-900psi and that was it... Any ideas??? Is this a cp3 gone bad??

2006 GMC 2500 LBZ "CMNSKLR" - SOLD
FOR SALE - 2011 CHEVROLET 2500 LML - EFILIVE AND TRANS TUNING BY PPEI, AFE INTAKE, SDP EGR DELETE, FLEECE PCV/RES DELETE CAPS, FASS 150, PROFAB DP, FLO-PRO 5" EXHAUST, EDGE CTS2, BILSTEIN 5100'S...
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post #2 of 6 (permalink) Old 12-07-2012, 09:24 PM Thread Starter
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Anyone?

2006 GMC 2500 LBZ "CMNSKLR" - SOLD
FOR SALE - 2011 CHEVROLET 2500 LML - EFILIVE AND TRANS TUNING BY PPEI, AFE INTAKE, SDP EGR DELETE, FLEECE PCV/RES DELETE CAPS, FASS 150, PROFAB DP, FLO-PRO 5" EXHAUST, EDGE CTS2, BILSTEIN 5100'S...
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post #3 of 6 (permalink) Old 12-09-2012, 04:30 PM
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Moving to LBZ --vehicle home-! Change the fuel filter-- and check the rubber fuel lines-- at the rear driver's valvecover and at the side of the trans. The lines get kinked and restrict fuel.

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
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post #4 of 6 (permalink) Old 12-09-2012, 06:44 PM Thread Starter
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Sorry bout placement thanks for move...

2006 GMC 2500 LBZ "CMNSKLR" - SOLD
FOR SALE - 2011 CHEVROLET 2500 LML - EFILIVE AND TRANS TUNING BY PPEI, AFE INTAKE, SDP EGR DELETE, FLEECE PCV/RES DELETE CAPS, FASS 150, PROFAB DP, FLO-PRO 5" EXHAUST, EDGE CTS2, BILSTEIN 5100'S...
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post #5 of 6 (permalink) Old 12-09-2012, 06:50 PM
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How many miles are on it? Might be cp3 but i would start with the cheaper shit first.
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post #6 of 6 (permalink) Old 12-09-2012, 08:58 PM
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Orings in the fuel filter head are probably shot, sucking air.

Try a fresh fuel filter before rebuilding with new orings.


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Si Vis Pacem, Para bellum !!!!
========================
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--CC, SB 4X4 Duramax Diesel/ 6 spd Allison Auto (PTO high idle mod)
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--PPE rear Diff cover, PPE Deep Trans Pan, PPE High Flow Manifolds and Up Pipes
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--Airdog II DF200 w/ CAT UHE filter upgrade...etc,etc...
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