86 20' Master Angler issues.

[linesider36]

Update. I got the boat about 1 1/2 months ago and it has just hit the water. The previous owner said when he put it away the 93 Johnson 175 Ocean Runner needed a water pump. Water pump was in stalled but when it was test run it pumped plenty of water but had bad spark and wouldn't stay running so a new power pack was installed. This seemed to cure that problem.
I had looked in the gas tank and the 1/4 tank of fuel didn't look or smell bad. I siphoned off 10 gal. and there was only a few drops of water so I added 20 gal. of good fuel and some Star Tron additive in hopes of burning off the old fuel. Well with the boat in the water the natural sloshing of the fuel in the tank has broken loose all the old fuel varnish and now the filter becomes clogged within 1/4 mile of the marina. The tank in the 86 MA is incapsulated in fiberglass so you can't get to it without major surgery.Tuesday I have a tank cleaning service coming that has the ability to pump your fuel threw a series of filters and keep circulating it until it reaches an acceptable amount of micron filtration that my onboard filter can handle. I hope this works. I will let you know how it turns out. Fingers are crossed.

[FishStretcher]

Good luck! I am curious how your fuel polishing works out. I hope the filter caught the stuff and kept it out of the carbs. I think big 2 strokes are more tolerant of that stuff than little four strokes, so you might luck out on that one.

[FAS]

sure hope that works for you,Hate to see crap in a gas tank..

[linesider36]

Fuel polishing complete and according to the marina mechanic they pulled out a lot of crap. They did it in the water so the polisher was able to rock the boat to break loose more stuff to filter.I heard it took about 2 hrs.Mechanic took it out and still had problems. The anti syphon valve on the tank couldn't handle what ever was left in the tank so he switched to a no valve hook up and the motor ran good. all fuel going thru my onboard filter of course. So after I paint the bottom I'll run a few tanks thru the system without the anti-syphon valve to clean the tank and then switch back...I hope.If that doesn't work then I guess a new tank might be in order. I hope Not!
This boats tank has the vent in the front of the tank with the vent hose coming out from under the deck just aft of the casting platform and running all the way back to right next to the fuel fill on the port side. Thats probably about 12' of hose. Would there be a problem to relocate the vent forward near the casting platform to eliminate all that hose that could be holding old fuel in the low spots?
Thanks in advance and hopefully more positive updates and pics to follow. Play safe.