Rick Holland

Hi, you could be describing my 1972 240z, which exhibited the same symptoms in 1984 when I got it! Ran great when it was running, but stalled randomly. My temporary solution was to let it roll to safety, pop the hood, disconnect the fuel line, and blow into it. Not sure if that helped - as I remember, the car was equipped with a mechanical fuel pump and an electric one which may have minimised any backflow. Anyway, after eliminating various possibilities (as you're doing), my dad and I eventually did solve my issue. We drained and removed the fuel tank, and rinsed it. Out came a small paper filter, about the size of a 50c piece, which had occasionally been sucked up against the fuel tube (?) inside the tank, restricting fuel flow and stalling the car. As an additional precaution, we cut a couple of V-shaped notches in that metal fuel tube to make sure nothing else could be sucked flat against it. We were never really sure where the paper filter came from, whether it was the gas cap or somewhere else, but that solved a very similar problem. Best of luck Rick Good luck.