fuel relief valve problems
 

Hi guys, Im having a problem with my 'new to me' 6.7 cummins. This is my first diesel but im learing fast!

The truck has straight pipe, smartyME, deletes.
The problem Im having is when I drive down the highway it throws code p000f, fuel valve opened. That is the ONLY code. When driving I can tell when it happens because the truck is down on power making almost no boost, BUT it does not 'fall on its face' like it should if its really blowing off 30k lbs of pressure!

The werid thing is its only going down the highway after about 30min. I can drive it wide open stop light to stop light and its fine!!

Any ideas? I dont think the valve is really open, mabey a bad sensor? something wrond with the cp3?
:argh:
(i have this post on other sites as well so if this is old to you then I appologize, thanks for the help)

have you ever shimmed the rail plug itself, and when it throws the code the ECM is gonna tell the truck to defuel so it will lower power levels. what do you have the Rail Pressure Revo set on for the Smarty

I have not shimmed the rail. But the truck is use so I'm not 100% sure wut the last owner did. The revo rail pressure is set to defualt. The code comes on even if I remove the smarty altogether.

you have either a bad rail plug or faulty sensor boss I can help ya by telling you how to shim it if your interested takes about a half hour and 3 little #4 flat washers

I read how to shim the rail, seemed pretty straight forward. I just didnt want to do it in fear of causing damage. Is there a way to check the sensor? or is the next step to shim the rail and go from there?

yeah shimming it is pretty easy just use padded jaws in your vise and be gentle with it. Honestly If I had to make a guess I would say the sensor is bad and not real way ot check it that I know of other than Chrysler Scan tool maybe. But pluggin or shimming the rail will let you know which one it is if you shim it and still get it money is on it being a bad sensor

Might be a bad sensor, or it may not be period. I'd have it looked at as mentioned above to be sure it's a sensor. $200 is a little much to spend on a new one, then find out it wasn't the problem.

one other thing I jsut thought of since you bought the truck set up the way it is there is a pssibility that they had put a industrial injection rail plug in it which we have found recently to have a pretty bad defect in them we believe. What the thoughts are is that the II rail plugs may not be machined at just the right angle which is allowing fuel to leak around the rail plug and return back to the fuel filter thus its leaking all the time (or most) whic will trip the FRP sensor and throw the code your getting becasue the truck thinks it has exceeded the pressure limits so this is a very good possibility to what is happening to you. Guys are switching back to the stock plug and have a world of difference in performance so not sure how you can tell if this is what is happening yet but ill check into it and if I find out more let ya know. Dont know what the rules are here about posting links to other sites so dont want to get in trouble but this is being discussed on the other site im on right this minute

That sounds like it could be my problem!!
that makes perfect sense. I know at one time it appears that this truck had a edge w/ att. stacked with the smarty.

if they were stacking the edge with the smarty 99% they plugged the rail and that is what is screwing you up the onlly way to tell is to try and find a stock rail plug in that case. PM coming bud

also do you have a Rail Pressure gauge this will tell us for sure if its bleeding or popping of or if its just a bad sensor. and if yor gonna run the smarty and do much more to the truck a Rail Pressure gauge is one your gonna NEED anyway. I like the Issopro EV2 just FWIW and get my stuff from James at rollinsmokediesel.com or Tony @ Mightydiesel.com both awesome guys to deal with tell them Buck sent ya. They are both vendors for my fab stuff!

got the PM.
thanks a lot for the help. Im going to try and track down a stock rail valve and see what happens!!

glad to help bud hope that gets ya fixed up. Guys are saying its a HUGE power difference when we get this fixed.

Ok well after some messing with the truck I've still got the same issue.
The factory fuel valve was still being used. But I did not take it apart to see if it was shimmed.
Still have the same problem though, I was driving up a steep hill with out a load and I could barley chug up the hill!!!! Good thing there I wasn't towing I'd of been screwed. sooooo any other thoughts?
Thanks for all the help it is very appreciated.

1 of 2 things after market fuel pumps are garbage..they are very unreliable.......#2 the harness to the pump could be shorted.... i just went through this on a 99 gmc van... most parts stores offer an after market pig tail that replaces the factory pig tail that plugs directly into the fuel pump:jump:

Thanks guys. I put a fuel rail plug in it and it is running great!! It was draining the rail pressure.

hey guys new to the site. I have '08 dodge throwing p000f ,p1011, p0087 codes. Just had low pressure pump put on still showing them would the fuel rail plug yall talked about cause that.

P1011 - Fuel Pump Delivery Pressure Too Low

P000f-fuel System Over Pressure Relief Valve Activated

P0087-fuel Rail Pressure Too Low

sounds like the fuel rail valve to me is yours plugged or not?

For now, until it's time for new injectors. Plugging the rail is a BAD idea. That relief valve is there for a reason.

I agree with you thats why mine is shimmed and not plugged

thanks for the info . idk if it is been messed with or not i bought it brand new dodge house is going to run the test on it tomorrow. they were complaing about the tuner being on it and the exhaust. they seem to think it might be the cp3 pump. what do yall think?

I did not want to plug my rail, No way no how. Way to easy to break some expensive parts.....But after talking to h&s and other members/vendors once the rail is shimmed it mighht as well be plugged. By the time a shimmed valve pops the damagae has already been done.

This is my reasoning for plugging the rail....it helps me sleep at night lol

Can anyone shed some more light on this for me? Like pics of whats being shimmed and why? Sounds like a simple stupid fix, but I am lost in translation as a newb.

Here is the how to video.

It's located at the front of the fuel rail behind the intake horn

It only needs to be shimmed if it bleeds off fuel pressure because some programmers will increase rail pressure enough to pop valve.
High rail pressure + popped valve= no power

Some ppl have to shim. Some don't

Whats the tell tale sign if you have popped the valve? Fuel pressure reading on a gauge? Or??

Thanks for the video.

It's wet with fuel that got released.

can u mess one up with it bieng all stock.i remember hearing a pop one day when i was running it a little hard.after that is when a started having the po1011,0087 codes. it will run good if u drive regular if i start pushing it the check engine light comes on with the codes.i noticed today when i made a right turn it fell on its face.