Fuel filter flare nut size

imidazol97

Top Dog
1,874
249
63
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
8,448
939
113
SE
Buick Ownership
1996 Roadmaster Limited Collectors Edition 58k - 1996 PAU 2019 Regal GS
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.
 
Last edited:
Get your turbo buick badge right here!
Protect your vehicle from code scanners
Top