It has a gas tank with water drops beside it - 2003 Ford F250 Super Duty Crew Cab

have to remove the gas/water in that is in the tank by removing the tank so you can turn it upside down and make sure every drop of the gas/water is out of the tank siphoning it out may leave some old gas/water in the bottom of tank then get rid of it let the tank dry out for a day and reattach it, then refill your tank with gas it may screw up for a little bit until the gas/water trapped in the fuel line is totally gone.
Go to you tube and look up "removing gas tank"

Maybe a bad ground

vapor can. is under the hood . usually left front

there are only x many tricks for working in a wall of steel.?
the body is steel and the tank is steel. (no xmen about.?)
so? what are they. , there are only 2 , besides a monkey with skinny arms.
1: lower front of tank only trick (or left or right only. as case may apply)
2: look under rear seats for hatch covers,
and yes, drop tank always works. (after drained)
old post but im doing, no answered posts for 1hr, today
http://www.alldata.com/

Your best bet is to drop the tank and then dump out the water. Dropping the tank isn't that big of deal. Remove the filler hose and a couple vacuum hoses. Unplug the main fue pump harness. Remove the fuel lines. Support the tank with an appropriate jack. Remove the straps and drop the tank.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Check replace your air filter, How old are the spark plugs- if over 40,000 kms I would replace the plugs, and are there any vacuum leaks? Is there any engine or service engine lights on? Try these suggestions, but you may have to see your repair shop for further diagnosis..

you have to drop the tank below the vehicle (usually easier to siphon first)

call a auto parts store and see if they have something you can flush the tank with also try this website www.autozone.com beside dropping the gas tank.

Normally it's just a matter of removing filler tubes from side, disconnect fuel lines & electrical connections at fuel pump/sender, undo the 2 straps, & lower it down.