tell from you r pic but is the primer pump the old style? with a thumbturn on top of a thing that looks like a big syrenge top? if so, when done pumping you are supposed to lock it down by screwing it clockwise at the bottom of its travel until it wont turn anymore.

i dont know what the result of its being not locked would be but an air leak into the fuel line seems like a good possibility.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.