diesel fuel diesel fuel diesel fuel

[Schicken bone]

drove from harrisburg pa to louisville ky today. roughly 650 miles w/gvr of 23k. now the truck is leaking diesel fuel from #6 injector(i think). hard to see. not quiet a year ago i took it in for the same thing. they replaced the hard line from the rail, said it was a tsb. who knows, not even sure if they did. this all took place in ga. i run a banks 6gun w/loader. i run it 98% of the time on level four. what are the chances of the box busting the seals, lines or what ever it is doing. this is beginning to p##s me off. not only that when it was in ga i had to replace the clutch, 13k. dodge said it was soaked with diesel but had more than 12k on it so i had to eat it. now the next part is my own fault because i put a valeo metalic and not a south bend. sorry to vent. does anyone have an idea what is causing the diesel leaks. the truck smells somthing awfull. HA! HA! thanks for all the input

 

[Schicken bone]

50 lookies and no opinions. whats up

 

[jvjump]

Ok! I have seen trucks leak some fuel when pressure box's are added to the system. I am not a banks fan. I feel you can do better for less money so i don't know if they add pressure are not. So i would first try to tighten the line at the injector and the feed tube. That has fix 99. 9 of the ones i have seen leak. . 1 still leaked with boxs on high. But would only get the head wet so it would collect dust no running or wetting the clutch.

 

[Schicken bone]

the last time i tried this verry thing, the line split and had to go to dodge as explained earlier. i know most people here are not banks fans, thats ok. i just dont understand how the same injector would leak in less than a year if the box didnt have something to do with it. or maybe i just got 2 bad #six injector lines*?#!. think i will call banks tomorrow.

 

[mberry]

I'm pretty sure Banks does pressure. That may very well be the cause of it leaking. Then again, why would #6 leak twice and none of the others? Just thinking out loud here.

 

[JStieger]

All your fuel return lines (CP3 overflow, rail pressure relief, and injector return) meet by the fuel filter canister.



When my rail pressure relief valve blew, it soaked the entire engine compartment due to the spray pattern as well as the fan blowing diesel everywhere, including diesel pouring down the back of the block and coating the entire underside of the truck as well as the rear quarter panels and tailgate. Literally dripping and puddling everywhere and made leaks appear from places that weren't actually leaking.



Anyhow when this valve blew it vented so much volume that the return line couldn't handle the flow and then as a result blew past the rubber fuel hoses that splice various parts of the return line.



To diagnose the bad pressure relief valve I removed the banjo bolt at the top of the valve and pushed the return line out of the way. I then started the engine and stood on my bumper and watched the valve. Fuel was bubbling out the top of it. I then gunned the engine and observed a 2 inch tall geyser coming out the top of the valve. Cummins actually has a test for the relief valve, which is basically x volume in y time. This procedure is copied in my Reader's Rig gallery.

 

[Schicken bone]

All your fuel return lines (CP3 overflow, rail pressure relief, and injector return) meet by the fuel filter canister.



When my rail pressure relief valve blew, it soaked the entire engine compartment due to the spray pattern as well as the fan blowing diesel everywhere, including diesel pouring down the back of the block and coating the entire underside of the truck as well as the rear quarter panels and tailgate. Literally dripping and puddling everywhere and made leaks appear from places that weren't actually leaking.



Anyhow when this valve blew it vented so much volume that the return line couldn't handle the flow and then as a result blew past the rubber fuel hoses that splice various parts of the return line.



To diagnose the bad pressure relief valve I removed the banjo bolt at the top of the valve and pushed the return line out of the way. I then started the engine and stood on my bumper and watched the valve. Fuel was bubbling out the top of it. I then gunned the engine and observed a 2 inch tall geyser coming out the top of the valve. Cummins actually has a test for the relief valve, which is basically x volume in y time. This procedure is copied in my Reader's Rig gallery.

you wouldnt have a pic of the relief valve? i am not sure where it is or what it looks like. the leak that i have is mainly coming done the back side of the block and it only drips ounce every 15 seconds or so. no loss of power, out side of clutch slipping the the truck runs fine

 

[JStieger]

Here you go.



Even if it is dripping down the back of the block it could still be coming from somewhere else since the engine is angled that way anyway. Between the intake manifold and valve cover is a little valley where fuel can run down in a small stream - at least it did this on my truck.



When the rail pressure blew on my truck the lift pump pressure dropped about 5 psi, but power still felt the same. After I replaced the valve I took the truck to a local Cummins shop and had them go through the entire high pressure fuel system just in case. They also steam cleaned the engine for me, but it still smells like diesel quite a bit!

 

[Schicken bone]

went and checked out the valve. there is no diesel at all on the rail. took a mirror to look be hind the #6 with the motor running. it is the only one that looks wet. but i still did not see and liquid fuel. it seems to only leak if its under a load. does that make since. gonna take it up the road and run it on level six and then check it.