I would research the lever type oil plugs, the same company made a lever type self tapping drain that you could put on the fuel tank. I dump about a pint of fuel via this plug about every three months. You would not believe the crud that comes out.
The schrader valve is that tire valve looking thing on the fuel rail. Rangersport07 gave some good advice here, but I would advise using air or gravity to push the bad fuel back into the tank. I do not recall if the '98 had a check valve on the fuel lines, but many do. These check valve are rather flimsy, and if 'blown', will not hold fuel in the lines for starting.
On the schrader valve, if you have an lock on air chuck head and some hose, do it that way, key on (pump running), put air chuck on schrader, and let the bad fuel run out the hose to a container. That way you are not spraying the engine compartment with fuel.
I do not know if you have an FPR (fuel pressure regulator) on yours, but if you do, that would be the next thing. I would simply replace it.