found cause of air in fuel. need opinion.

so inj cups 4 & 5 are leaking exhaust gasses into fuel & also turning fuel filter black & putting black soot in tanks. on my ser 60 detroit. shop said detroit does not sell a aftermarket kit to seal the injectors but interstate mcbee does. he said they go on the end of the injectors & should seal up, but there is a chance they may not work, in that case we have to pull the head. anybody have any info on this repair. I never heard of it. what is the % of it working 50/ 50? they told me to just keep on eye on my davco for the next week & see if I still have air bubbles in fuel filter. any thoughts on this procedure?

 

I already replaced all fuel lines. pick up tube cannot be replaced it is welded. I did a test a while back read about it I think on here, to test the suction line. using s 5 gal bucket of clean fuel to also test the davco. replaced all davco parts too. Iam glad the shop found the 2 inj leaking, at least NOW I know the source of the air.

 

it is a 95 ddec 3

 

they said they checked & checked return lines. he said pressure test revealed which injectors were leaking. about 7 years ago I had a 6 pack put in at my local freightliner dealer, they told me something about them puttin in as best as I remember over sized -o- rings to help against any problems? I also read on here or the only other detroit forum I visit about if fuel is turning black & air is in fuel than exhaust gases are getting tru injectors, if it was only air & not the the black soot, I would not be thinking injectors leaking. the shop owner used to be top manager at williams detroit in B-ham.

 

well that would be easy, cause my davco is over 20 years old, came with the truck. it is the ole style 380 they are not expensive & would be easy since everything is there already. I just hate throwing parts at problems, jut to find out the ONE part that needed replacing. not to mention I have 15 spare filters. this type davco has very few parts than can cause air leak, unless there is something internal. the top,bottom -o- rings & collar seals good, new shut off valve at bottom, the 2 fuel lines are tight & new, no leaks there. I would not have a truck with out a davco. if not for the black soot I would replace davco as a process of elimination, but the soot tells me injectors as told by the experts?

 

well they told me to keep an eye on it & see how it does, don't remember if he told me specifically to watch the davco. I know that is where I see the bubbles.