vc commodore
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New fuel has been put in and old was drained out, there’s fuel going into the carbo through the line, not sure on what the needle and seat is sorry
The seat is the part of the carby that the fuel line bolts into at the carby...Inside that seat, is what is called the needle....That needle must slide easily in the seat and it also should seal off the seat properly. Both the needle and seat are brass pieces...
So unbolt the fuel line (13MM) and then with a 14MM or 9/16, unbolt the seat, being careful not to drop the needle out.....Check the needle moves freely within the seat....Also whilst you have the seat removed, check you have fuel just inside the carb area, where the seat goes. This might go a little ways to solving the problem you have