Check and see if you have any gas on the ground after you park your car. Check around the gas tank and gas cap. It's possible that the fuel pump (which is in the gas tank) has hoses that may be leaking. If this is a slight leak, it might only manifest itself via a gas odor into the trunk or passenger compartment. It might be a good idea to put the car on a hoist and follow the fuel lines from the engine to the fuel tank. There should a one line that takes the fuel from the fuel tank to the engine and another that brings back the excess. There should also be another line coming out of the fuel tank that is for venting. Unfortunately, the fuel pump and hose connections are not easily accessible and require either removing the gas tank or cutting a hole in the trunk to access it. You should definitely take care of this soon as leaks don't get better, only worse and it is a potential fire hazard. Good luck!
SOUND ITS YOUR EVAPORATIVE EMISSION SYSTEM NOT WORKING THE DEALERSHIP HAS TO CHECK IT OUT.YOUR PURGE VALVE SOLENOID NOT WORKING ALSO VENT VALVE CAUSING GAS VAPOR PRESSURE BUILD UP IN FUEL TANK. OR CHARCOAL CANNISTER GAS SOAKED.
I had this problem a few years ago with my 1998 Windstar. It would only happen when the rear was loaded, e.g. when I had passengers in the middle or back seat. When it was just the driver and a front seat passenger, no gas smell.
The problem was a bad seal at the top of the gas tank. The extra weight over the rear of the van tipped the body enough to have a little gas leak from a full tank.
Unfortunately the fix cost about $300, mostly labor to remove the tank, fix the 29 cent gasket, and reinstall the tank.
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