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Walleye Guy

Removing gas from 1992 Crestliner

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A friend of mine has a 1992 Crestliner Sportfish with a Volvo-Penta I/O. He brought it into the big Crestliner dealer in town for winterization. The dealer said that the plugs were rather gummed up and they were actually surprised the boat ran. My friend has had problems this summer with hestitation and rough running. The dealer suspected bad gas and recommended that the tank be emptied of the remaining 5-6 gallons of gas. The dealers wants $118/hr and estimates it is a 3 hour job. My friend said no thanks and has decided to do the siphoning himself.

He bought a manual siphoning kit and 10 feet of hose. He has tried siphoning the gas through the fill hole and hasn't had any luck. Does anybody have any recommendation on how to empty the tank on a Crestliner like this? The gas tank in under the floor of the boat with limited access.

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On I/O motors I usually disconnect line at fuel filter, add another section of hose and run it underneath motor out to the "plug" hole, since it's the lowest spot in the boat, and siphon into a container outside boat.

If you want to do a better job you might have to open the center section of floor where the sending unit is located (if it has a removable section), unscrew and remove it it very carefully and try to siphon out from sender hole which is quite large and will allow you to see inside too. BE SURE YOU DON'T USE A VACUUM CLEANER or anything that can create spark.

Otherwise you can add new gas, and try to siphon the "cocktail", it might be easier to eliminate almost all the bad gas.

In any case if I was him next spring I would rebuild the carburetor, new plugs, fuel filter, tune up, etc. and fill up tank with new gas to dilute the bad gas, a couple of cans of Seafoam, then run boat this way until dry. If the carb is gummed out cleaning the tank will not solve the problem, it will eliminate the cause .

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Crank the tongue jack up so the gas runs to one end of the tank. Its at that low part of the tank you want to siphon from.

You'll probably have to put a little weight on the end of hose so it lays on the bottom of the tank.

Your tanks outlet might have a check valve that won't let gas just run out. The suction from the fuel pump opens that valve so draining from there might not be option.

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