Another componant in the fuel delivery system, that has never been discussed as a possible contributor/cause. Certainly codes would be thrown by the ECM if this box wasn't happy. On this trip, I have seen a 'U' code without description...more on that, later...

(LLY unit shown for illustration and useful text purposes only)

http://cgi.ebay.com/ebaymotors/Fuel-...mZ160455552145