G 3500 1 Ton Van V8-350 5.7L VIN L 4-bbl (1985)
Removing Rich Mixture Stop Screw
Removing Lean Mixture & Rich Mixture Stop Screws
6. Remove lean mixture screw plug and rich mixture stop screw plug from air horn using a suitably sized punch.
7. Reinstall rich mixture stop screw and rich authority adjusting spring in air horn and bottom lightly, then back screw out 1/4 turn.
8. Reinstall air horn gasket, mixture control solenoid plunger and air horn to carburetor.
Adjusting Rich Mixture Stop Screw
9. Insert external float gauge in vent hole and with TOOL JD-9789-130, BT-7220 or equivalent , adjust rich mixture stop screw to obtain 4/32" total
plunger travel.
