I started seeing a similar problem about 6 months ago on my 2002 E450 Coachman motorhome. I always fill up the gas tank when I return from trips and started noticing that I was missing gas when I started my next trip. I appear to be loosing 2-3 gallons of gas per week (the rate of loss seems to be somewhat consistent regardless of how long I store it.) I am not seeing any leaks where I park the vehicle. Then thought someone was stealing the gas and added the lockable gas cap. Last month I took it to the Ford garage and they could not locate any leaks or smell gas under the motorhome. They also checked the computer for engine code faults and did not find any. I'm stumped. Does anyone have any suggestions?
