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 Ect

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Old 11-19-2012, 04:32 PM   eBay Motors  #1 (permalink)
 
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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
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Old 11-19-2012, 04:35 PM   eBay Motors  #2 (permalink)
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Moved to lly area
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Old 11-19-2012, 04:37 PM   eBay Motors  #3 (permalink)
 
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ok.
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Old 11-19-2012, 09:09 PM   eBay Motors  #4 (permalink)
 
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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.
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Old 11-20-2012, 03:27 AM   eBay Motors  #5 (permalink)
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Bottle test it right away (at 160 MPA) and shim it if it's leaking.
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Old 11-20-2012, 06:03 AM   eBay Motors  #6 (permalink)
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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.
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Old 11-23-2012, 04:02 AM   eBay Motors  #7 (permalink)
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This is good info.Thanks jc1843.
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Old 11-23-2012, 04:05 PM   eBay Motors  #8 (permalink)
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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.
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