When you prime the carb , check the fuel line out of the pulse pump, the fuel should not run back, if it does renew the pulse pump seal kit.
Check the float and fuel fill valve in the carb, if that is sticking you will starve the carb and cut out after a short time.
The usual cause of this type of fault is the pulse pump, if you have renewed the seal kit , then check the green pipe that goes into the pump for leaks , it can sometimes touch the exhaust and damage the pipe.
Also check the return fuel line, check the restrictor jet that is in the line , also when ticking over there should be fuel coming back into the tank if the pump is ok.
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