There is a T-fitting on the block near the firewall where the IP return and injector return lines meet and go back to the tank. I noticed there is a lot of slop in the line to the injection pump, even after some tightening.

What's inside? Does it wear out?

I haven't disassembled it because I don't have anything to replace it with if doesn't go back together.

I have everything in the area apart to replace the tappet cover gasket and am wondering if my leak in that area is a combination of oil (tappet cover gasket) and fuel (from the T-fitting).

Thanks,
Brian

 

I don't think ive ever seen this fitting before so I can't help you out, maybe clean it off with some brake clean or something and start your truck up and see if you can see it leaking at all.

 

Can't start the truck. I am reassembling after a tappet cover gasket replacement. That means all the fuel system is off including the injection pump.

Before I put it all back together, I was hoping to rebuild this as necessary. I figured it might be easier than with everything back in place. But maybe it doesn't matter.

-brian

 

maybe take some pics and load em on

 

There are some rubber washers in there. If it won't tighten up you should get new ones.

 

I disassembled and verified the rubber. I'm going to keep an eye on it to see if it leaks. Have you had any trouble wiht yours leaking? Is this a Cummins part?

Brian

 

Are you refering to the fitting to the left of the rear lifting eye?
Like Dave said above, there are little rubber bushings that compress under the nut. They are a "Weatherhead" fitting , I got mine at Hose Man but any hydraulic supplier will have them probably even NAPA.
Jim

 

Yes, that's correct. Did you find your rubbers were needing replacement?

Brian

 

Mine were a bit loose but I replaced them anyway since I was already in there and don't like external lubrication. Since it is a return there is not too much pressure as it returns to the tank.
I have a small leak from my lift pump that I still need to fix.
How did the rest of your job go?
After the side cover job, I had to replace the eccentric bearings in the vacuum pump after it fragmented and I lost 90% of my brakes.
I have pictures of mine in my gallery.
Jim

 

Hey all,

I got the truck up and running on Saturday. I had a problem with a fuel leak on the supply side at the injection pump. Then I remembered we had problems with that a few months back when I had the pump first installed. Closer inspection revealed the threads were marred. I picked up a new line from the Cummins dealer and no more leak.

I still have oozing at the lower back corner of the tappet cover gasket. It appears to be clear (fuel) and not oil (black). I think it may actually be residual fuel in the foam insulating cover. I can't see where else the leak would be coming from. Anybody see anything like this before? I can't see any leaking out of the T-fitting. I don't know where else the leak would be coming from.

-brian

 

You reinstalled the cheesy foam insulating cover ? That things like a nasty sponge that will continue to ooze for years to come.

 

You may be right.

-brian