Had a similar problem with my Yamaha when it was brand new. It was driving the dealership bonkers. It would run fine to the golf course. I would check in and return to the cart only to fine that it would not start. After the fourth time into the shop and just inches away from getting a new replacement cart, a new mechanic took a look at it and diagnosed the cooperate. I turned out to be the wiring to the fuel pump. the wire fittings were epoxied to the wire instead of solder. As the cart ran for awhile, the fitting would expand and lose wire contact. A new fitting was installed and have not had an issue since. The cart was a new 2016.
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