When I got the 84 I have now, it had some old gas in it along w/some water...rather than paying someone else, you can remove the inspection plate, then the sender....take a length of fuel hose w/a bulb in it and run it thru the drain hole in the transom w/an appropriate catch can under it...stick the top end of the hose down into the tank thru the opening where the sender was...pump the bulb til running and release...it'll siphon all your gas for you and save what you'll pay some one else...I used several 5 gal gas cans to catch the old stuff...
The trick is to find a place to take all the old gas and safely/legally dump it before you start pumping it out...unless you're sure there is some contamination other than old fuel in the tank, you should be fine to just put back in the new stuff w/out a tank clean-out...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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