Posted January 7, 201411 yr Got a 2002 cummins that's getting fuel in my engine oil. Put new injectors in and ran for 200 miles and it's doing it again. I've put dye in the fuel and let it idle but I cannot see where's it's leaking. Any thoughts?
January 7, 201411 yr If its fuel in the oil then you are probably having fuel leaking from the injectors. Are they remanufactured injectors, or NEW? Did you change the crank oil after replacing the injectors? What type of injectors did you buy specifically? Other then that, I really cannot see fuel getting into the oil other than maybe somewhere in the crossover tube area... Are you sure its fuel? Did you do a paper towel drop test for a basic troubleshoot?
January 7, 201411 yr Author I changed the oil. They are brand new bosch rv275's. New orings on crossover tubes. Been told from cummins fourm that possibility of the front seal on the vp44. Don't know if this is common or not. And I know it's fuel because it smells of fuel. 2002 QCLB 2500 Cummins. Auto, autometer cobalt gauges (fuel pressure, boost, pyro, trans temp), 4" exhaust, J-hooked, leveled, edge comp hot, other wise stock for now 89 Cherokee on 84 Toyota frame. 4bt cummins NV4500. Sittin on super duty axles and 37 BFGs
January 7, 201411 yr Were you getting fuel in the oil before the injector swap? Or did it start when you put the new ones in?
January 7, 201411 yr What he said^^^^^ plus Just an FYI if you didn't know but most dyes require a black light to see the source of the leak, look for the glow. Could be a bad crossover tube where it seats against the injector body too. Edited January 7, 201411 yr by Wild and Free
January 7, 201411 yr If connector tube was bad, it wouldnt show in oil. It would go back through injector return. Reason I say this, you dont have any oil touching the connector tube.
January 7, 201411 yr Hmm, crav70, explain to us the process in which you replaced the injectors. Because they need to be done in a certain order to have a proper seating... If its not a pi$$ing injectors or any fault in the process of replacement, I'm out of an idea on what it could be...
January 7, 201411 yr If connector tube was bad, it wouldnt show in oil. It would go back through injector return. Reason I say this, you dont have any oil touching the connector tube. Could be a combo issue, bad seat and o-ring. Brain fart there but hey it is totally possible. This is what happens when I stay up too late after having to get up at 4am for work.. Edited January 7, 201411 yr by Wild and Free
January 7, 201411 yr I really dont follow the procedure and have never had a problem. Pop in injector, line up hold down clamp, start bolts, pop in connector tube, tighten hold down bolts.
January 7, 201411 yr Author Well it was doing it before I swapped injectors. Truck has 94000. Got a new vp early last year. I put the new injectors in all greased up. Put the hold downs on but didn't tighten. Installed connector tubes and lines. Tightened hold downs to 89 inch pounds. And I was using a black light. I believe it's a high pressure leak. I know it's not common rail pressure but I can't get it to leak at idle so idk what else it would be Edited January 7, 201411 yr by crav70
January 7, 201411 yr Owner There is only a few places where few can get back in. 1. Injector body O-Rings 2. VP44 front seal 3. Stuck Open Injector So I suggest you pull all 6 injections out have them pop tested. While they are out you can replace all the injector body o-rings. As for the front seal of the VP44 typically that will rupture for pressures in excess of 20 PSI some get luck and don't have a issues and others don't have any luck.
January 7, 201411 yr Author A brand new injector bad? Wouldn't it skip or miss? And my lift pump is 15-19psi.
January 7, 201411 yr What struck me as a strong culprit from your last post was you said you "Greased" the O-rings up good. A small amount of engine oil just enough to make them moist is all that's needed, too much grease in an enclosed spot can and will cause issues you are seeing too.
January 7, 201411 yr Owner A brand new injector bad? Wouldn't it skip or miss? And my lift pump is 15-19psi. Not always. Just like the CR Engine they don't skip or miss when they are stuck open and no change in smoke either. The only way to tell is to pop test them on a bench.
January 7, 201411 yr There is only a few places where few can get back in. 1. Injector body O-Rings 2. VP44 front seal 3. Stuck Open Injector So I suggest you pull all 6 injections out have them pop tested. While they are out you can replace all the injector body o-rings. As for the front seal of the VP44 typically that will rupture for pressures in excess of 20 PSI some get luck and don't have a issues and others don't have any luck. Do you mean 20 PSI of lift pump pressure? I just want to clarify is all, thanks.
January 7, 201411 yr "recent new VP" somebody put the front seal in wrong, or damaged it during assembly- or reused original I always tighen cross over tubes first, THEN torque the injector. Too much grease will hydraulic the oring right out of the groove. Gotta be one of those 3 you said "its doing it again'....... makes me lean towards the front seal... your injector replacement didn't fix the problem the first time. Edited January 7, 201411 yr by rancherman
January 7, 201411 yr BTW, it may be a good idea to include what type of lift pump you have, in your sig...
January 7, 201411 yr Author It's just a airtex 7153. Savin for a fass. And I'm leaning forwards the front seal just wanted to see what some other like minded people thought
Got a 2002 cummins that's getting fuel in my engine oil. Put new injectors in and ran for 200 miles and it's doing it again. I've put dye in the fuel and let it idle but I cannot see where's it's leaking. Any thoughts?