fuel spraying everywhere!

[JStieger]

In the picture of the rail relief valve,is that the sealing surface?I have a spare one but it is in my glove box at the dealership so I can't look at it right now, I was under the impression it was up inside of it and unless you took it apart you could not see it.

The inside of the fuel rail nipple where the valve sits has a machined surface that matched the surface shown in the picture (except for the middle hole). The valve is torqued to 75 ft-lbs and the banjo bolt is 17 ft-lbs. The valve threads look to just be straight rather than the tapered type. The surface inside the fuel rail and the valve surface itself looked pretty polished too so I'm pretty sure that's the sealing surface. I have been known to be wrong though numerous times!

 

[justinp20012500]

Smell the exhaust. . see if it smell like diesel

:-laf :-laf :-laf



Of course it does.



I know what you meant by that

 

[JStieger]

This is the face of a happy camper!



Got the truck back today and all is good. It was #1 injector line that was loose at the rail connection. The leak travelled down the line and puddled onto the fitting on the high pressure line from the CP3 to fuel rail, which made it look like this fitting was bubbling like a garden hose.



Some of you may recall that I replaced the #1 injection line a month ago due to its sealing surface being nicked. I could have swear I torqued this connection properly, but I guess not . So, yeah, I do feel kind of stupid, but I guess it also goes to show how critical proper torque is to these fittings.



In all, it cost me $136 for Cummins Rocky Mountain to go through all the high pressure fittings to loosen, inspect, and retorque properly. They even steam cleaned the engine bay (as well as the obligatory test drive :-laf ).

 

[Vaughn MacKenzie]

Glad you got it taken care of. It sounds like what was happening was at idle with the rail pressure around 3k psi it wasn't leaking much, but under load and rail pressure rising above say 10-15k PSI it was probably spraying out pretty readily.



That's one of the drawbacks of the HPCR system, at those super high pressures the fuel can find the tiniest leaks, and blast a lot of fuel all over once it gets going.



Vaughn

 

[JStieger]

That's one of the drawbacks of the HPCR system, at those super high pressures the fuel can find the tiniest leaks, and blast a lot of fuel all over once it gets going.



Vaughn

That's the truth! Try just over 1/4 tank of fuel in 6 miles. And the cardboard test for high pressure leaks never picked up anything; Brawny paper towel test on the otherhand...



The parts guy even had the nerve to ask me how my mileage was on this tank - sheeeez the nerve of some people :-laf !!