i smell fuel with the a/c on only when its hot like today over 100 dagrees? just today my 01 taurus is doing the same now ?

Wke up in the morning to goto work the truck will not start ,just put new plugs ,wires ,distrub cap ,rotor new fuelfilter ,cranks ,cranks nothing walk away 5 minutes come back crank,crank won`t start ,then i pumped the pedal coulpe times it sputters like its going to start ,then it starts ,then...