Fuel Filter - 6MT Infiniti G35/G37/GTR Forums Oct 16, 2016So my cars fuel mileage has dropped quite a bit -- I was thinking of some reasons why. Ran a couple cans of seafoam through the gas tank -- didn't do much.. when I thought about the fuel filter.. I know in the G35 the fuel filter is located in the tank, and I read a thread on Driver that says Infiniti doesn't recommend replacing it untilAuthor: FeffmanInfiniti Discussion · Discount Tire · Performance Mods Where is the fuel filter on a 09 g37? - JustAnswer Jan 24, 2011Where is the fuel filter on a 09 g37? - Answered by a verified Infiniti Mechanic. We have an 2009 Infiniti G37 and from time to time it will sputter and lerch back and forth. It is an automatic but it reminds of driving a manual transmission vehicle in first gear.