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I bought the Universal Fuelhawk (not the XL) and on my 1977 337G there are 43 gal remaining in each long range tank when the fuel is just visible. Here are the gallons remaining for each marking of the Universal Fuelhawk tube:
Marking Fuel Remaining
1 48
2 53.5
3 58.1
4 63
5 66.5
6 69.5
7 72
Ernie
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