Sounds like the same thing that happened to my friends V10. He also checked the fuel rail pressure it was at zero. Instead of draining the tank and dropping it, only 6-8 bolts hold the bed on, it is real easy to remove them and the the screws holding the filler neck. Then jack the front of the bed up or get a couple buddies to lift it, its not very heavy. Watch for anything else attached to the bed as you go and block it once you have enough room to work. Dont forget the top seal we did his twice, completly back together putting everthing away and found the new seal in the box, bummer. Did it in less than an hour the second time.