Bleeding D4 injectors

Hey Guys,

I'm trying to bleed the injectors on this old 2t, and can't remember if the throttle lever needs to be locked off or open to get fuel to the lines. I have fuel at the individual pumps, but can't seem to get anything past that. Any ideas?

Thanks,
Bob

open it wide open to bleed injectors, it will give a longer stroke to expell the air faster.

The service manual indicates fuel priming should be done with the pony running and main engine compression release lever in the start position in order to force air and fuel through the fuel filters and the fuel pump vents. The throttle should be in the extreme forward position so the pumps are shut off.

If your going to vent through the pumps and injectors or at the injectors then the throttle should be open to facilitate flow.

I didn't stop to think when I replied before, but

since you're asking about difficulty getting fuel through the pumps,

and you've probably tried it with the throttle open and closed already,

The rack may be stuck or the throttle control linkage not actually opening the throttle due to wear or binding somewhere. Open up the side cover on the injection pump housing and watch the rack move back and forth as you move the throttle control. If it doesn't move, then that may be your problem with no fuel delivery.

The rack commonly sticks because a pump plunger is stuck up and not returning to the rest position as the cam rotates beneath it. If the plunger is stuck up, it most likely won't twist either which locks the rack bar which is meshed with all the plunger gear sectors. Work plunger up and down with a screwdriver and penetrating oil spray to loosen it up. Then the rack should move back and forth when you move the throttle control through it's range from fast to shutoff.