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  1. 5

    M37 Hesitation

    You are correct the piston works against a spring. When you hit the throttle there is a sudden drop in vacuum and the spring pushes the piston in the opposite direction and pumps fuel into the carburetor. Figure 03-1 in the M-37 ORD 9 is a good exploded view of the carb.
  2. 5

    M37 Hesitation

    Stock M-37 carb has a vacuum operated accelerator pump not a mechanical one so you won't see gas flowing into the carb by hit the gas petal. Seen this many times usually the problem is the accelerator pump piston leather seal or the cylinder it rides in is oversize or worn. Unfortunately you...
    • 54M37
    • Post #11
    • Forum: M37
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