I have been finding fuel dripping from my engine. Today I found out it is comming from the fuel line or transfer tube on my 99 24v. Fuel line was tight so I figured it is the oring on the tube. Is there an oring on the fuel line or just on the transfer tube? Is this a common problem? Truck has 160000 miles and had a new IP put on 4000 miles ago. I am new to diesels but have worked on alot of cars any info would be appereciated. Any tips of tricks to help make this a reliable truck would be great.

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Also is there any pressure in the fuel lines when the engine is not running, and does anyone have a sorce or part number for the fuel transfer tube orings. Thanks alot

 

There should be a pick of the p/n of the o-rings in this thread below they are from Cummins. I am thinking that if there is fuel coming out at the line connection it is probably not tight enough or has an obstruction in the threads.The transfer tube is pushed into a tapered seat in the injector and if the torque isn't right on the line the transfer tube won't seat right.The other possibility is a slight miss alignment to the injector. Statically the is no pressure in the fuel lines after shut down.the most you would see is boost pump pressure without the truck cranking or running

Check this out :


https://www.dieselbombers.com/5-9l-2...tallation.html

 

Thanks for the info. I just bought the truck from my step dad and it hasn't leaked in the two years he has had it, of course my bad luck steps in and when I buy it from him it starts to leak. I put a 3/4 in wrench on it and the fuel lines are tight. With it running the head under the transfer tube is getting wet with fuel so it must be the oring correct? Reading the post you gave me does the transfer tube just push in to the head and the fuel line holds it in, and how much torque is the line to be torqued to.

 

yep just pushes in and the line is 30ft lbs

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which cylinder is leaking?

 

It's #4 third foward from the rear easy to see thank god its not the one in the back. Its my wifes daily driver for now so I need to get it fixed asap, but it still runs great I found it at my moms house and had to drive 400 miles home with it that way. Did you use the special tool or just a screw driver to pop it out.

 

screwdriver, let us know what you find out!!

 

Thanks to all your help Jet. I ordered the new orings today from cummins hope to see them tomorrow or Friday and hope to fix it Saturday. I will keep you posted, I just hope its not the line. Found out today that the truck had the Injector pump changed out at 145000 it has 160000 now so thats good news. I will be putting a fuel pressure gauge on it soon to keep an eye on the lift pump. Thanks again.

 

Be careful when you put them back together not to get any crap in the ends of your injector lines or injector tubes. When you have them out to put new o-rings in them, inspect the injector tubes closely for little scratches or washes in the mating surfaces. The tubes are not as hard as the lines which means that they wil wash first. They run about $50 and the lines are more like $170. If it has been leaking for very long, then I would suspect that the tube is washed.

 

It started to leak probably a month or so ago.It just trickels out around the tube.

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Will I have to bleed the fuel line after I put it back together?

 

Well I got my orings and I started to work on my truck and when I went to take the line off it was very tight. So I loosened up the line and torqued it to 30lbs and no leak. When they put the injector pump on they must have torqued the heck out of it.