check the fuel rail. I have a 2005 and mine was incredibly and I mean incredibly rusty. the truck has a vapor system with a pump out back by the fuel tank (just in front of it). Lots of hoses, rubber, and nylon between the front and back. start checking for cracks and broken hoses.

Oh by the way, I had to do my fuel pump. the factory pump was broken in several places where it seals to the lock ring, and I'm sure that if it had gotten much worse it could have been a massive leak. vapor, possibly fuel. YOu can't know the shape it's in without taking it down which is a pain.

I believe if there is a vapor leak, though, it should eventually throw a DTC and put the engine light on