Engine Fuel Leak

[DT86]

Grab a phone book or better yet search online and look for diesel injection services near you.

 

[skyhook]

If it were me, with the engine "cold', I would clean all around those 3 injector feed lines and also that rubber hose above it, I don't know what it is but it could be leaking from there and going down on those line fittings. Clean er up good just to verify where the leak is coming from.

 

[OhioCowboy]

Good point. Seems like the rubber hose connection would be the weakest link. Any idea what that rubber hose is for? Return line? What's the reason for a return line?
Thanks

 

[ThomasH]

Good point. Seems like the rubber hose connection would be the weakest link. Any idea what that rubber hose is for? Return line? What's the reason for a return line?
Thanks

It is there because the injectors you have are 'popoff' type injectors. The pump builds pressure until the valve pops open and sprays, and then the pressure decreases until the valve closes. The excess fuel that is not needed at that point is returned to the tank.

The rubber hoses are not under much pressure, so unless they are cracked, rotten, etc., they probably aren't leaking. Many tractors just have small spring type hose clamps on those fittings to hold the rubber hoses on. But in case you do need to replace them, make sure you get diesel fuel rated hoses, which are typically teflon lined. You can get it at an auto parts store.

 

[OhioCowboy]

Today I cleaned the area where it's leaking and noted that as soon as I turn on the fuel (without the engine running) at the sediment bowl it starts leaking around this middle plate. I have not loosened this plate, but I have cracked open the hex nuts to bleed air. Does fuel come from the sediment bowl to the pump through the rubber hose above the red arrow?

 

[Harry in Ky]

It's your tractor so it's your choice. If it were mine, I would clean off the I.D. plate on the pump, jot down the numbers, and call my local fuel injection pump shop. Read them the numbers, describe what/where the leak is, and see what they tell you about repairs and prices. I would NOT attempt to remove the individual components from the pump. That's just looking for trouble. I have removed and installed any number of such pumps(the whole pump), it's not that difficult. Again, your money -- your choice.

 

[skyhook]

Today I cleaned the area where it's leaking and noted that as soon as I turn on the fuel (without the engine running) at the sediment bowl it starts leaking around this middle plate. I have not loosened this plate, but I have cracked open the hex nuts to bleed air. Does fuel come from the sediment bowl to the pump through the rubber hose above the red arrow? View attachment 416546

Your guess is as good as mine....
follow the hose and that should tell you, but it does look like a return line.
If you "cracked" open those hex nuts beside the red arrow for bleeding???why?
You should crack the injection lines at the injectors, not where you did, you may have let some dirt in.
So you have confirmed that its not leaking from that hose?
I personally would use "brake clean" to clean that up, it will remove any fuel and give you a better picture,
I would also wiggle that hose to check for leaks to eliminate it from or for a possible leak.
But if your saying its leaking from that middle injector line housing, then it could be that seal you referred to.
Make sure you eliminate all other possibilities before, playing with the injection pump could be costly.

 

[OhioCowboy]

Will clean everything, snug up all connections and see what happens.
Thanks all for your thoughts on this.

 

[OhioCowboy]

Sorry to drop out after fixing the problem. I loosened up the nut that I was using for bleeding (The one that held the middle plate) then sprayed the area real good with carb cleaner. Then I tightened everything I could find. The leak stopped. My next fix was to replace o-ring "2" in the breakdown drawing, then o-rings "15".