All the QL's I have ever had used 3/8" fuel line from the tank to the carb elbow.
Is the shut off leaking or is it that you need a new grommet/bushing in the tank?
The valve has a filter as part of the assembly and is a friction fit in this bushing.
You will have to replace the elbow as well if you go with a smaller fuel line.
From the parts book:
Ref:
9
N/A
Hose | (Use 9.62 inch of 3/8 hose from bulk roll marked IH-117310-C1)
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