What motor? the 4Y engine? Straight propane?
Sounds like a ground issue with the fuel solenoid. Check wiring to the distributor. Remove all fuses and make sure they are good. Main solenoid and slow path is run off of controlled circuit through exam and relays. May have usual broken wiring around valve cover towards fan. Grounds to frame by #3&4 cylinders. Make sure to pull back the wire loom.
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