fuel filter wrench size [Archive] - GrandAmGT.com Forum


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10-30-2006, 12:18 PM

I forget what size wrench to use on the flare nut that connects to the fuel filter...someone wrote 5/8" (i did a search) but that does not fit. Is the 16mm wrench the correct on to get?

Also the nut is rusted and not budging at all when I tried using an adustable wrench. There any way to remove it? Can this flare nut be replaced?


10-30-2006, 02:36 PM
13mm wrench.

heres intructions

10-30-2006, 03:27 PM
thanks....but the 13mm is a socket wrench used to remove the bracket that holds the fuel filter on a Grand Prix.

I need to know the size of the flare nut wrench used to turn the nut on the fuel line connecting to the fuel filter.

10-30-2006, 03:42 PM
sorry i didnt read threw it all i thought that used to be the one for the grand ams give me a few min and i can find it ived done it before but dont remember the size i know its in a thread somewhere

10-30-2006, 03:53 PM

hopefully thats some better help

10-30-2006, 08:17 PM
The filter side of the nut is a 20mm and the line side of the nut is a 16mm. Use some GM rust penetrant and let it soak for ten minutes. Put on the wrenches and squeeze them together to loosen.

Yeah yeah I've heard all about liquid wrench and PB Blaster.... nothing I've ever found works as good as the GM Rust Penetrant... Also called Heat Valve Lubricant.

10-31-2006, 04:14 PM
thanks for the help.