Perkins fuel return fixed

The saga is over ,,. 354 Perkins Fuel return failure turned out to be the screw in the little banjo fitting on the
fuel return .a little spec of something plugged the tiny hole that is smaller than the smallest needle My Sara
had. now it leaks a small dribble ,. No One ever suggested to watch for that one , so I am warning anyone with a
perkins to watch out for this .that tinydamhole cost me a thousand bux ,. and a lot of frustration, and lost
harvest time .. It is important that the fuel return is open on perkins engines or it WILL BREAK THE rotor in the
injection pump ,,.Guess how i know ?

Glad you found it, I've seen that happen on other Perkins engines too..

I Just found one of your posts on this issue in combine talk .. DieselTech,You did indeed Address that Rascal and i stand corrected . reading Your post does correlate with my problem ,You have Always tried to help Me and i Appreciate that so much ,Thank You ,And Thanks to all others that offered their stories to try to match my problem and help me learn more,. but, it was difficult for me to understand the function of each line.
Until i understood the travel traffic of the Fuel it was all confusion to Me .once i took the time to learn it i was home free ,I had looked at that banjo fitting before and checked for a relief and finding none i wondered why the hole in the screw if their was no relief ??.
That hole is so small i could not see it except under brite lite .Golly that is difinately The ACHILLES HEEL of a Perkins motor if i ever saw one..one spec of dirt getting past the fuel And The Pump can be TOAST .It seems incredible to me that such a small hole would be adequate to return fuel and avoid over pressuring the injector pump .. but there it is ,From Now on if i ever hear that motor stammerpuft again , I will chek that damfitting ,. AGAIN Thanks , for the Help .

That bleed fitting is needed to remove any trapped air from the filter base, as CAV DPA pumps on Perkins do not have the internal head air bleed passage like some other engines use. If you look closely, the final filter base has both the injection pump supply AND return lines, so both ends of the pump have 4-5 PSI pressure. It's designed that way to help keep air out of the pump, but the system won't work with the bleed orifice plugged. Tractors use one bleed, some combines have two, one on top of each of the double filter base. Another thing to watch for, when the filters begin to plug the fuel return flow will stop, then there's a chance air will enter back through the return side orifice. The injection pump has a vane transfer pump that will try to draw fuel when the supply slows down to less than engine needs. No fuel, means it will draw air..