Ok, I guess I'm not sure why it doesn't have warranty. I worked on these alot, and they are still under warranty.
Anyway, I'll try to walk you through this.
Lets check the obvious. On the LH side of the frame about the middle of the truck, there should be a fuel switching valve where both tank lines come together. Should be a brown/white and a red and 3 black wires. Make sure the connector is in all the way.
Check fuse F2.33 15 amp in the central box under the dash. Pull it out and check it. Put it back in and use a 12 volt test light to test for voltage with key in run position.
Let me know what you find.
Again, did this happen all of a sudden? Does it read "E" on both tanks?
Thanks
Edited by fordanswerman on February 22 2006 at 10:27 PM
FORD MOTOR COMPANY CAR AND POWERSTROKE SPECIALIST FOR OVER 16 YEARS. ASE MASTER SINCE 1991. CURRENTLY WORK AT A MAJOR FORD DEALERSHIP. GIVE ME YOUR FORD PRODUCT QUESTIONS, IF I HELPED, PLEASE HIT THE ACCEPT BUTTON. EXPERTS QUESTIONS ON FORDS WELCOMED