Fuel rail pressure sensor???? - Chevy and GMC Duramax Diesel Forum
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Old 05-11-2011, 12:48 PM   eBay Motors  #1 (permalink)
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Fuel rail pressure sensor????

I just got my truck diagnosed at chevy because it's not been idleing or running right and they said they need to replace my fuel rail pressure sensor. They said it's $700. Anyone have any advice to get it cheaper?
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Old 05-11-2011, 01:10 PM   eBay Motors  #2 (permalink)
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very doubtful... its most likely your fuel pressure regulator which is >200 or possibly injectors.


whats the specs on your truck
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Old 05-11-2011, 05:16 PM   eBay Motors  #3 (permalink)
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My truck was diagnosed today for a Fuel Pressure regulator also. Mine is doing something totally different. It is a 01 Duramax and it looses power going up hills pulling my trailer. They said it may fix the problem but may only be half the problem. Frustrating. My fix is quoted at 550(price & labor) right now. I quoted the part at Napa for $375 and that is with my companies discount.
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Old 05-12-2011, 07:23 AM   eBay Motors  #4 (permalink)
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i got a brand new one for 150... do some more looking
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Beech - 05 LLY CC/SB 4x4
12.31@108.57 On stock turbo and fuel system

Thanks to,
Big Dipper, Efilive, Calvert, Precession Converters, Nick@Duramaxtuner, Eaton, Pureflow, and Falken
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Old 05-12-2011, 05:15 PM   eBay Motors  #5 (permalink)
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Old 05-12-2011, 07:03 PM   eBay Motors  #6 (permalink)
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I suggest you do the "bottle test" to check the FPRV--[Fuel Pressure Relief Valve] that is the sensor on the fuel rail. LLY engines do have a weak spring in the FPRV.

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 where it comes out of the fuel rail. Then hook up long hose 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. Anywhere you can have the bottle standing in a upright position.

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

After you do this, check the bottle. If its empty, 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 05-12-2011, 07:23 PM   eBay Motors  #7 (permalink)
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check merchant automotive for an fpr $175. merchantautomotive.com
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Old 05-15-2011, 07:38 AM   eBay Motors  #8 (permalink)
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Thanks yall. jc, im gonna try to do that monday, see what happens before i spend money on somethin (sensor) i may not even need.
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Old 05-15-2011, 07:42 AM   eBay Motors  #9 (permalink)
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if you need a fpr you can get one for cheap from alligator performance and do it yourself..it's not a lot of fun to do but it'll save you money thats for damn sure lol
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