I hardly ever drive my truck. 03 F-250 5.4L W/ 60,000 miles. The last few times i have driven it maybe thirty miles each way back and forth to home depot while building my deck over the past month, it seems to be sucking down gas faster then usual(maybe this is in my head because of the gas odor???). While driving if i come to a stop with the window down i can smell a strong gas odor, this is when i first noticed it. Then After i park the truck and get out i notice a relatively strong gas odor. its hard to pinpoint but i crawled under the truck and noticed a strong odor around the gas tank but dont see any leaks. i also notice the smell under the hood near the firewall on the drivers side. Other then the smell and possibly worse than usual gas mileage( need to test this thought though) the truck seems fine and runs great. no MIL light or any other cause for concern. Any thoughts or personal encounters with this issue will be greatly appreciated.

 

Sounds like you may have a bad vapor canister line allowing fumes to escape which could also allow today's crappy fuel to evaporate quicker.

 

Rotted out fuel filter. after close inspection under the truck i noticed a stain on the frame rail under the filter. it would not leak at idle only under a load a steady drip. i looked in the manual and its says system Fuel press is between 30-55PSI. does anyone know if this is variable press, dependent on load or should the fuel Press stay a constant press?

 

The pressure varies depending on engine vacuum. At idle is will be around 32PSI and under load (low intake vacuum) it will raise to 40+psi.