CODE: "Low Fuel Rail Pressure"??????? - Chevy and GMC Duramax Diesel Forum
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Old 01-01-2012, 05:02 AM   eBay Motors  #1 (permalink)
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CODE: "Low Fuel Rail Pressure"???????

07' Chevy 2500hd
Edge Controller is showing a code of "Low Fuel Rail Pressure" also the dash has a blinking message that "Power has been reduced" anyone have any idea of what this might be?
was driving the truck home from work and the truck will not go over about 50mph and the message was flashing along with the engine light was displayed. Checked the code retrieval on my edge unit and there it showed the message of Low Fuel Rail Pressure.......
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Old 01-01-2012, 05:53 AM   eBay Motors  #2 (permalink)
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did you recently turn the level up on your edge?
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Old 01-01-2012, 06:04 AM   eBay Motors  #3 (permalink)
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Try a bottle test right away and see if it's your FPRV.

Beyond that you'll need a someone to read fuel rail pressure (Tech 2, EFI V2, Edge Insight, etc) to see what's going on.
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Old 01-01-2012, 06:07 AM   eBay Motors  #4 (permalink)
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yes

Last edited by DmaxCop; 01-01-2012 at 06:14 AM.
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Old 01-01-2012, 06:08 AM   eBay Motors  #5 (permalink)
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Originally Posted by MTL_Dmax View Post
Try a bottle test right away and see if it's your FPRV.

Beyond that you'll need a someone to read fuel rail pressure (Tech 2, EFI V2, Edge Insight, etc) to see what's going on.
A bottle test???? I am totally new to the diesels and have no idea what you are talking about sir...
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Old 01-01-2012, 06:10 AM   eBay Motors  #6 (permalink)
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did you recently turn the level up on your edge?
yes, i switched it from tow mode to race???
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Old 01-01-2012, 06:13 AM   eBay Motors  #7 (permalink)
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A bottle test???? I am totally new to the diesels and have no idea what you are talking about sir...

No worries, we all started somewhere. The FPRV (fuel pressure relief valve) opening prematurely is more common with earlier trucks, but still worth eliminating. If it does, you will lose your fuel rail pressure and the truck will go into limp mode.

The best way to test the FPRV is the bottle test

On the drivers side fuel rail near the firewall there is a horse shoe shaped 1/4" hose close to the glow plug bracket. disconnect the hose closest to the drivers side where it comes out of the fuel rail. Then simply hook up long hose and clamp it tight and plug the "U" shaped hose.

Run the hose to somewhere that a bottle can be mounted. If your hose is long enough, you can mount it between the coolant tank, and airbox. This really doesn't matter just as long as you can have the bottle standing in a up right position.

Now drive the truck hard, with some wide open throttle runs.

After you do this, check the bottle. If its empty, or has a little fuel, your FPRV is not bleeding off fuel and you don't need to shim the valve.

If it has more than a little fuel, that means that your fuel rail relief valve is leaking and you will then need to either shim the valve, or install a race valve.
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Old 01-01-2012, 06:53 AM   eBay Motors  #8 (permalink)
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yes, i switched it from tow mode to race???
You may be draining your fuel rail with the added fuel demand required by the "race" tune.Switch back to a lower power level and see if that works.You may want to change your fuel filter as well if it has not been done in a while.
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Old 01-01-2012, 07:04 AM   eBay Motors  #9 (permalink)
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Mine has been rebuilt and shimmed tight and still blows when pulling hard. Think it's time to order a race plug.
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Old 01-01-2012, 07:17 AM   eBay Motors  #10 (permalink)
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Thanks for the info, gonna switch it back to a lower setting and go get the fuel filter changed right quick and see what that does for it....worse comes to worse, I still have the factory warranty on it. I will keep ya posted...
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