What may be causing fuel to leak under drivers seat

I would have to guess that there is an issue with the O-ring seal.

Lift the back seat and check. Some cars have a hatch there to access the fuel pump. Did you recently have work done on it ?
Maybe that the fuel line is leaking.

over filling fuel tank will cause an oder of fuel also it will leak into evap emissions system which my radiate into car and usually if you had any kind of leak in the fuel system whether it be fuel lines or evap side it would throw a code and if you had a fuel line leak it should affect the way the car runs by not getting sufficient fuel pressure not sure you are over filling fuel tank but thats the only thing i can think of not knowing if you have MIL light on

I remember VW used to have their heater core under the back seats. When the core goes bad, all the water in your radiator leaks under the back seat floor mats. I'm not sure if this is the case, but does your heater work? Do you smell a maple-like odor under the seats? Do you keep filling the radiator a lot? Real puzzle.
Or, it may be coming from under the seats. Water from rainy days may be coming in from under the body. Check if you can see daylight under the seats: Place a high beam light source under the car and see if you can see the light from the inside. It is really a mystery if this isn't the cause.

Have you checked the fuel filter in the line to see if thats the leak ?

IT MIGHT HAVE COME FROM THE FILLER TUBE TO THE GAS TANK! OR POSSIBLY ONE OF THE FUEL LINES ATTACHED TO THE TOP OF THE TANK! ON A NEWER CAR, YOU CAN ACCESS THE FUEL PUMP INLET FROM UNDER THE BACK SEAT! DEFINATELY CHECK THIS OUT, AS IT CAN CAUSE A FIRE, AND YOU COULD GET HURT!

This is caused by a bad sending unit in the fuel tank, I have seen this many times and a new fuel sender fixes these every time.


This is very common in montanas... also for the fuel gauge (I believe its applicable for a 2000 and later), it may be an issue with the C-305 connector.

Its a pass-thru connection for wiring (from inside cabin to outside/underneath). It connects various wires for things in rear of vehicle(including connection to fuel pump/sensor). While its weatherproof on bottom (underneath) it is not inside cabin, spills/ various leaks inside can cause water intrusion and subsequent corrosion of wires.

The connector should be under carpet to the rear of drivers seat (you may be able to see exactly where by looking under vehicle for a bundle of wires that come out from cabin) .

Hope helps.

The fuel pump and strainer are located inside the fuel tank.

There are three possible locations for this component due to different production dates/locations: under hood, passenger side, rear engine area, below firewall, mounted in fuel line or under vehicle, passenger side, below seating area, mounted on frame in fuel line or under vehicle, driver side, below rear seating area, mounted on frame in fuel line

Easiest method to find, follow the fuel pump lines from the tank forward, you'll find the filter.

If you change the filter, it's not a bad idea to put a little Gumout fuel injector cleaner directly into that new filter, about 1/2 full before reinstalling, that will give your injectors a quick clean. It can cause a short sputter or two but I've never seen it cause a problem and it does help clean the fuel system quickly.

You'll also want to remember to turn the key on for 3 seconds, off for 3 seconds, alternating until the fuel pressure builds before trying to start the vehicle, after repairs are made to either the pump or the filter.

Use caution when removing lines, pressure and flammable !

Good Luck
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if it has a back heater either a water line to the heater core broke or the heater core for te back heater sprung a leak probabley the heater core on the back heater replace either the hose or the back heater core whatever is leaking.

could be a leak futher up in the line ,, and following the line down ,, make sure u can see good under the car,,,, becarefull