best way to drain fuel tank

[brownrock]

Haven’t been on the forum for quite some time mostly because I stopped driving my beloved 1997 v90 when cataracts in my eyes got real bad. Surgery behind me and now I can finally drive again.
Gas in the tank is OLD couple years or more. Tank is NEAR EMPTY maybe 5 – 10 liters.
I want to drain the gas out and put fresh gas in.
Suggestions???
Looks to me like the fuel tank does not have a drain plug. Or is there in fact a drain plug and where should I be looking?
In the absence of a drain plug I would appreciate any suggestions as to what owners here consider to be the safest, easiest and best way of draining whatever little gas is left at the bottom of the tank.
I don’t know how much water is actually in the tank. I'm guessing very little. Engine starts fine, accelerates seemingly ok, idle is a bit rough, Exhaust is white with water vapor which it wasn’t when I last put fresh gas in (about 2 years) which is why I think it’s water in the gas (not head gasket which I replaced before I parked the car about 5 years ago).
Or should I just add say 10 liters of gas start the engine and let the engine run and hope what little water is in the tank will ‘work its way out of the system’? Personally I’m not in favor of this. Would be easy but risk of damaging injectors, pump and other components seems substantial to me! I’ve ruled out additives which I have never found to actually work well / as promised / advertised.
Is there a siphon barrier / trap on the 1997 v90 preventing me from siphoning the gas out?
Many thanks in advance for any suggestions / ideas / how tos....

[volvolugnut]

I have drained several fuel tanks using a cheap plastic hand crank siphon tool. When the anti siphon device gets in the way, I use a smaller suction tube (as small as 1/4 inch) to get past the valve. You also have to twist the tube around to get it to the bottom of the tank. This method is slow but works.
Your tank may have two compartments which will make this process only work on the filler side. If the removed gas is really grungy, you may have a clogged in tank filter or even clogged fuel pump.
Best to get this all resolved before you start the car.
volvolugnut

[brownrock]

Thanks Volvolugnut,
VERY helpful and very much the sort of answer I was hoping for
Rereading your post what I'm wondering is 'How do you know your 1/4" tube is PAST the valve and sitting on the bottom of the tank? or is it obvious when you actually do it?

[abscate]

Moisture in the engine. My T5 just sat from January 2021 when it ate a valve to now before I got her running again.

In the world of sealed evap gas tanks, just put a good 10 gallons of gas in, one bottle of dry gas ( methanol) and drive it away.