I had the same problem for awhile! There were no leaks until one day the gas smell got worse (along with the gas mileage) and a small puddle of gas appeared below the car where the filter was. Turned out the rubber hose from the fuel filter to the metal fuel line had a small crack in it and it got worse over time. I ordered a new hose online for about $25. It is a hose with a custom fitting on it that attaches to the fuel filter. It was simple to replace!

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1989 300E

2005 Acura TL

2011 Hyundai Elantra Limited

Swing hard! Take chances!