I would look for an air leak first , as it has no cost.
Disconnect the fitting at the fuel tank and cap the line.
Disconnect the fitting and pressurize with about 10psi and a gauge and a valve.
If pressure holds for 3 hours or more , start with renewing the fuel lines.
IF the lines can be replaced mostly with metal , and only short pieces of rubber to connect , that is more trouble free.
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