injector pump seal?

[akbear]

I checked the injector timing on my Kubota b4200 (z600 engine), which was fine, but.... on the front cylinder I could dry the inside of the injector pump fuel fitting and watch for fuel while I slowly turned the engine by hand.

On the back cylinder, after I soaked up that residual fuel in the fitting, more fuel would immediately fill that fitting to the brim. I kept cranking and waited for it to overflow and then checked the timing mark on the flywheel and all was good. I'm just concerned it shouldn't be doing this, that no fuel should appear inside that fitting until the cam actually depresses the plunger in the pump.

Thanks!

 

[North Idaho Wolfman]

It's very likely not an issue.
What lift pump is on it?
Are the vent lines working as they should?
It has no forward check valve so a little pressure in the pump will cause that.
It's not going to free flow when the system is closed up.

 

[akbear]

It's very likely not an issue.
What lift pump is on it?
Are the vent lines working as they should?
It has no forward check valve so a little pressure in the pump will cause that.
It's not going to free flow when the system is closed up.

Thanks, Wolfman. You're my hero. I just replaced the o-ring and copper washer under that fitting and the problem went away

 

[North Idaho Wolfman]

Thanks, Wolfman. You're my hero. I just replaced the o-ring and copper washer under that fitting and the problem went away

Should help with popping that injector if it was leaking.