lgeiger13 from the previous post was right on !.

I had a check engine light appear on my 2000 Ford Ranger (142K miles). Disconnecting the battery did not clear it. Both Autozone and Midas read the code (P1451) and said it was the Gas Cap. Went to the Ford garage to get an original ($25) but the code did not clear. Did some searching on the net and ran across the lgeiger13 post. Slid under the truck and just in from of the spare tire is the canister and on the front top side of that is the solenoid. Traced the wires back a few inches across the top of the canister and it was immediately obvious they were damaged. Apparently these wires rub on the bracket for the canister and it had worn through the protective tubing and broken the wires in serveral places. Poor design. Used a few inches of wire, solder, some heat shrink tubing, electrical tape, and "split loom tubing (3/8 inch I think). That did the trick. I also re-routed the wires away from the bracket. My guess is just about every Ranger will have this problom eventually.

Thanks for the post lgeiger13.