2004 XLS 4.6 --- 2nd event in 2 months. Drove the xp in the AM - all good. Shopped at Costco - no start to return home. Prior event I was in shock to notice any dash info. This time I had my senses - no security flashing, but still tried another key. Still no start. Fuel gage slightly above 1/4 tank. Waited for about 10 minutes in hopes it would reset as it did before. After about 10 minutes, it started up, and ran fine. Checking to see if it was a fuel problem, I filled up at the Costco station. The attendant let me keep the xp running during fill up. I noticed the fuel gage did not move as fuel was added. The nozzle kicked off, but the gage showed about half a tank. Attendant said he added 16 gallons of fuel. Being familiar with the vapor canister problem, I'm thinking that may be my problem. With the fuel gage reading just above 1/4 tank, I should have added more than 16 gallons to a 27 gallon tank. I may need new a vapor canister. Will have my shop test, and replace, if necessary. On the way home, the fuel gage moved to almost full. At home, turned off xp, then restarted....all is fine. Bought the 2004 in 11-2005 new...... 18,000 miles now. I'm badly crippled with arthritis, so I'm at the mercy of others---I'm 86. Thoughts ? EDIT: Online info suggests not to have the key in the 'on' position', or engine running during refueling. The fuel gage will not record accurately until the next run cycle. That answers my gage concern above.