Jinma 254 Injector pump

[Kooosh]

Sorry for the belated reply.

Finally had some time to work on the tractor today. I have unscrewed the supply line from the fuel tank to the injector pump and have taken the little filter out and cleaned it. Fuel is flowing freely from the sediment bowl valve. When I unscrew and pump the primer, I can hear fuel squirting back into the fuel tank via the return line.

Today I loosened the 3 fittings that connect to the injectors and watched for fuel as I cranked the engine. Fuel was only coming out of the third hardline (closest one to the fuel tank). The other 2 hardlines weren't showing any signs of fuel? I then undid the line that's on top of the injectors that connects to each injector and primed using the primer and heaps of fuel squirts out. So it seems there is an issue with the first and second hardline?? Any ideas? Should I completely remove both 1 and 2 hardlines and clean/blow out with compressed air?

 

[RonMar]

Do you have a fuel bleeder port on the injector pump? I looked at your pics, but they are too close-up. It could be that you have an air pocket in the injector pump and you are basically pushing fuel with the primer around the air pocket and back thru the return line to the tank. If you can post a pic that shows the entire IP, I may be able to point it out to you.

Next, on top of the IP where the hard lines attach, under each fitting is a small check valve. If those check valves are not sealing, the fuel goes back and forth in the line instead of advancing up the line one step for each pump stroke...

 

[Kooosh]

Hi Ron,

I've attached some pictures of where I assume the bleeder is on the injector pump. Is it the bolt with the groove through it? Can I just bleed the injector pump through that bleeder by opening it up, pumping the primer and then tightening it back up?

And I also read to bleed from the top of the fuel filter but mine doesn't seem to have the 10mm bleed point?

I will check those check valves out. I couldn't see any fuel escaping through them

 

[thepumpguysc]

The bleeder screw IS that 10mm screw in pic #3..
The hose IN FRONT of the inj. pump is the INLET.. The hose that goes across the bleed screw is the RETURN fuel.
I don't recommend tearing into the inj. pump.. those "top nuts" HAVE TO BE TORQUED back down..

 

[RonMar]

yep, that is the bleeder with the slotted head. yes, loosen it and pump the primer to purge air. You can loosen the hose connection banjo fittings/bolts at the fuel filter to purge air from the filter housing.

The fitting I was referring to above is the ferrule nut around the hard injector line that attaches the line to the fitting on the top of the pump... I am sure they have a torque spec(everything does) but I have never torqued one, just re-attach snug, same as the banjo fitting on the other end where it attaches to the injector...

 

[Kooosh]

Still havent been able to get her started.. Have bled air out multiple times and still nothing. So 2 out of 3 injector fuel lines still aren't getting fuel. When I loosen the the nut, crank no fuel comes out.

After reading some more threads on here, I came across a post mentioning the "fuel rack/governor" could be an issue with not starting. How do I know if the governor or rack it in the correct position?

 

[thepumpguysc]

If u only have fuel coming out of 1 port on the inj. pump & u have GOOD flow TO the inj. pump..
ITS THE INJ. PUMP..
& its not something u wanna mess with.. its time to call someone..

 

[jacques54]

Like thepumpguy mean by GOOD FLOW FROM TANK, remove the banjo bolt off the hand pump hose that come from the tank (there is a mesh filtrer IN that bolt). Let it flow in a pail, it should flow freely, not dripping?
Out of the hand pump, when you pump fuel come out from bleeding screw with pressure and with no air?
To see fuel coming out of hard lines at the injectors,you must crank the engine to see little drops coming out. (Only few cc per stroke), normal?
Did the oil in pump ever be changed?
Lot of questions but long distance diagnostic is not easy.
Jacques