I recently bought an all original '74 Scout, with 345/727/4WD. First IH I've owned. It runs decent, but I've got a problem when I go to fuel it. Virtually immediately I hear fuel coming up the fuel tube, and if I didn't shut down the nozzle, it would spill fuel all over. After several minutes I can get another fuel tube worth of fuel in it, but obviously something is amiss. I've yet to dive in to disassembling the filler neck, checking for possible obstructions there, plugged vent tubes, etc., and just wondering if anyone has had a similar experience or might have a suggestion as to initial steps to take? Many thanks.