Fuel filter flare nut size

imidazol97

Top Dog
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What size is the nut on the end of the metal fuel line that the filter screws into? I am having trouble determining what size flare nut wrench I need to buy for it.

I tried to get a 16 mm to fit on but it won't. I don't know if it is because of the rust or because I need a larger size wrench.
 

HotZ28

Full Member
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Buick Ownership
1996 Roadmaster Limited Collectors Edition 58k - 1996 PAU
Mine happens to be 5/8" which is equal to 16 mm. You may have to clean the fitting with scotch bright pads to clean the rust off. I have no idea how bad your fitting is rusted. BTW, this fitting usually breaks loose easily without the use of a "flare nut wrench". Soak it with PBblaster overnight to see what happens. Good Luck.
 
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