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Hi my name is Robert.....
I see no other experts have responded. What I might try and do is put the supply line in a fuel can on the ground and see if the generator will start, sometimes the line from the tank to generator can suck air into the line if it is weathered or cracked. So this will eliminate the supply line and tank as part as the problem, if that is not the problem you could have a bad control board or fuel pump for the generator. Robert