So to tell the story here I need to go back to last year.
I find no record of ever talking about this, but I'm sure that I have somewhere.
Last year I was having problems with the engine not shutting down right after the key was turned off.
Turned out that it was a rather common problem with the 8.3 Cummins engine, and I found a rather good article on it here
Fuel Shut Off Solenoid ReplacementThere is a new and improved solenoid produced by Cummins.
So while it was there for general maintenance I had them replace it.
I solved the problem of the engine running after the key was turned off.
This was done right before last years race at Bowling Green.
Just out side of Bowling Green last year we pulled into a Loves for fuel and found the back of the Motor Hone covered in fuel and the front of the trailer also covered in fuel.
I called Cummins and in concert with the Loves mechanical the fuel lines to the injector were tightened (they were lose), we got the Motor Home, trailer and engine washed at a Blue Beacon and were on our way.
No more problems.
Now I told that story to tell this one.I have been having a small drip for some time and on each general maintenance a Cummins I have asked them to look for the problem.
This thread was started because I found the drip on the bottom of the injector, and though I had found the source.
First I thought it was a hose running along the left side bottom of the engine, than found the drip on the bottom of the injector/governor.
Today the weather broke and I spent a good deal of time looking at the problem. The quote of $8,450 for just the pump was an eye opener.
So in poking around and moving wire harnesses around I discovered hidden in the depths of the engine on top of the governor another spot of fresh oil/fuel.
I should mention at this point my noise does not work well and when I took some of the oil/fuel from the bottom of the governor I detected no fuel smell.
So a long shot with the wire harness pulled to one side.
This was well hidden, but certainly gave me hope that it was not coming from the injector pump.
Let's get a little closer.
So where is this coming from, we are now above pretty much everything mechanical.
Directly above this is the air intake running to the turbo on the far side of the engine, and above that completely out of sight unless you bend down into the engine compartment and look up at the top of the dog house is a foam insulation pad.
It is kind of hanging like insulation does with age, but there is some wetness on the intake pipe.
So ... could this be where the oil/fuel is coming from. How is it getting wet?
I looked from the rear of the Motor Home being a contortionist with a flash light an the telephoto zoomed out the way out and on the back side of the air intake there appears to be to fresh streams of fluid.
Sorry for the poor photo, I took many and this was the best one I got.
Note the injector line are dry.
I have two schools of thought now.
One is I have a pin hole leak in a line that is soaking the insulation.
Two is when the lines were loose from the install of the fuel shut off solenoid (and I have no idea why they would have to be loosened to install the solenoid (unless they were in the way of the install)). When the back of the Motor Home was soaked and the front of the trailer was covered in fuel this insulation was soaked also. If this is the case once again having service done for me as proven it is best to do it yourself even if you do not know what you are doing.
The wiring to the solenoid is poor (wires cut to short so they will not fit into the wire loom).
I will be going to Cummins tomorrow and have them look at this, if there is no high pressure leak, I hope they step up and replace the insulation and clean the engine.
It is a hope, but suspect I will not have the result I hope for. I have been very happy with the other work they have performed so will burn no bridges over this.
Thoughts?
