Check the inside of the tank to make sure the clunk/fuel filter is at the bottom when the truck is flat on the ground. If it'll start with the front up, that might be an issue. Also check your choke on the carb. We had a customer bring one in for the same reason. We asked him to demonstrate and he pulled and pulled and never took the choke off. Also check your carb needle settings. Not sure which carb is on there but go 1 1/4 on low and high. Maybe someone at the factory didnt set them correctly.