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In Reply to: Common engine problems with 1939 D2? posted by Peter on Thursday, June 28, 2007:
there is a screw at the back of the injection pump on each cylinders pump. it has two flat sides, if the tractor has been setting and you lose prime you well have to open these screws to get the air out,it well not come out on it's own some times. that is way the screws are there.