Hello My name is gary I have a 1985 mr2 toyota..Can anyone advise me how much work it is to take of the gas tank...thank you

For me, only as much work as it takes to drive it to the mechanic and pay him to do it. I'm so not handy like that.

Jack the rear-end and place on jackstands.
It should be a couple of straps...but make sure the tank is as empty as possible. Each gallon of gas remaining is 10lbs so it'll be heavy.

Place a jack with a board (to distribute the load) under the tank....apply lift-pressure.....undo the straps..and slowly lower.

It's pretty easy....just patience and time consuming. I would really recommend you buy a Haynes Manual from Canadian Tire. It will walk you through the whole process.

Well, there are obviously much more mechanically inclined Toyota fans around here than I am. :)

just jack up the back and undo everything on the gas tank.

If you have the time and patience to do it yourself, all the power to you because it can be a lengthy and frustrating process. You may be better off taking it to a garage!

From my 1988 MR2 Handbook (page 2) The tank capacity is listed as 41 litres, or 9.0 imperal gallons. As far as I know, the fuel tank design and capacity remained unchanged throughout the life of the AW11 MR2. Hope this would help.
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tips: always check the distributor cap