Gas caps sometimes go bad. My folks at a '97 Camry and during the first 3,000 miles it developed what sounded like a back-fire. Several trips to the dealership, lots of inspections and nobody could figure it out until a friend of my dad mentioned the gas cap. Sure enough, that was it. I'm not sure how it happened, but the pressure on the cap was too much and it would release the pressure (from driving and I assume from fuel being depleted from the tank) with a loud pop. Countless man-hours were used to figure out what was wrong with the car for it to be a $14 warrantable item.
If the cap can't make a good seal, the car may think it has a leak.
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2003 Classic Edition, 5-speed with 7-ball shift knob, badges removed, dark tint, Borla split exit exhaust, short billett antenna, Nu-Image white-faced blue flamed gauges and 15\" American Racing Aero Wheels.
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