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1994 KW 1720 Sportsman Fuel Tank Replacing

Questions and Improvements on Key West Boats Hulls, Parts, Hardware and Structural Components

Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by handi2 » Wed Aug 08, 2012 5:45 pm

We used the original fill and vent lines. The tabbing underneath the deck was simply 3/4" marine board attached with 5200 and SS screws. The original piece was placed back in with 5200 also b/c any resin will not stick to marine board. On top of the repair we used biaxel cloth and epoxy resin after grinding it down and cleaning. This area is not a "load" area so it will be fine. The finish was sprayed gelcoat in white. It does'nt match the original but it's not readily seen.
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by handi2 » Mon Sep 17, 2012 3:01 pm

I have the broken down 2001 F80 in the garage. Like already posted no mechanic has ever heard of a rod knocking on a Yamaha engine. From my past automotive engine rebuilding the sound is just like a rod knocking in a car engine. Most are telling me that is more than likely a valve dropped and the piston is hitting the valve. I will get into the engine this winter and sort it out. Hopefully that's all it is.

I have rebuilt many car engines and a couple of 2 stroke Evinrudes but never a 4 stroke outboard. It may be possible to repair the one valve and piston. I'll see when I get in there.
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Sports1720man » Thu Feb 21, 2013 8:38 am

I'm replacing the aluminum tank in my 97 1720 sportsman and just happened to run the saw across the fill hose. So I decided I should just replace it while I have the console and floor out. I cut all the foam that I thought might be holding it but still no luck. Could the fill hose be pinched between and deck and stringer? And I also was wondering if any of you all know the dimensions of those moeller tanks?
Thanks in advanced,
Chris
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by handi2 » Thu Feb 21, 2013 12:44 pm

I think I may have the spec sheet on the new poly tank. If I find it I will post it. Tom may have it also. If you have enough room you can use a male x male coupler to repair the cut hose. I do know they make them.

It would not let me post a pdf file.
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by handi2 » Thu Feb 21, 2013 1:01 pm

The tank is;

53.75 long

26.00 wide

6.50 deep in the center tapering to 4.0 inches deep.

You can also use a smaller Poly tank for less cost.
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Tom Marlowe » Thu Feb 21, 2013 6:10 pm

The smaller tank is easier to put back in too.

I've noticed a reluctance of consumers to go with smaller tanks in boats even though the need has reduced dramatically over the last ten years or so. There was a time not long ago when 31 gallons in a 17' boat seems legit, but with modern engines that's a lot of fuel. Some may need it occasionally, but most of the time a 20 gallon tank is plenty. Just food for thought.
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by handi2 » Sat Feb 23, 2013 6:33 pm

Tom is right about the newer modern engines with EFI. They use so little fuel 20 gallons is plenty.

When we put the new F70 Yamaha on my sons 1720 he used it running around in the bay for 2 days and the fuel gauge didn't move. He started filling the tank and counting the gallons used and it was only a few gallons in that period. He ran the boat on a Saturday and Sunday with the kids all day, pulling toys and it used 3 gallons.
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Raysingler » Sat Mar 30, 2013 6:23 pm

handi2 wrote:Tom is right about the newer modern engines with EFI. They use so little fuel 20 gallons is plenty.

When we put the new F70 Yamaha on my sons 1720 he used it running around in the bay for 2 days and the fuel gauge didn't move. He started filling the tank and counting the gallons used and it was only a few gallons in that period. He ran the boat on a Saturday and Sunday with the kids all day, pulling toys and it used 3 gallons.



I am curious about the speed with the f70. I have a 1996 1720 with the original Yamaha 115 ( 1996) . I am thinking about a repower, but want the boat to do 45-50 mph. According to my new 597 hd di Hummingbird, I am doing 47 all in. Thanks Ray
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by handi2 » Sat Mar 30, 2013 6:28 pm

Ray,

You will never get that speed with the F70 but the gas consumption would be much less. Top speed with a 4 blade prop was 34 mph. With a speed prop you could get a little more.
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Raysingler » Sat Mar 30, 2013 6:53 pm

thanks for the quick answer.... trying to weigh all the options , a new boat or keep this one . Any opinion on a 115 hp Evinrude 2stroke Etec? Thanks Ray
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Kingtiger88 » Sat Jun 08, 2013 5:35 pm

what is the model # of the tank you put in your 1720 ? MIne has a hole in the top , go figure :( . Thank you so much for your post , I am prepped and ready to put in the new one . Your post was extremely helpful THANKS AGAIN !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Kingtiger88 » Sun Jun 09, 2013 7:31 am

What is the fuel tank model number and what type of resin did you use to reinstall the deck ?
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Craig Pruitt » Wed Jul 31, 2013 9:10 am

I just realized that I have to do the SAME thing to my 1720! It sucks, but this post will help.
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Mattey » Sun Aug 04, 2013 5:40 pm

I'm in the same boat...literally
:thumbdown:
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Re: 1994 KW 1720 Sportsman Fuel Tank Replacing

PostPosted by Fluid_Momentum » Wed Apr 02, 2014 12:41 pm

Handi,

I'm also replacing my tank on my 2000 Key West 1720 due to holes in the aluminum tank. I have one question. Did you cut the fiberglass wall facing the bow under the deck? My OEM replacement tank is 54" in length and I only have 56" of total length in the cavity. Bottom line is the OEM tank won't fit unless I free up some more room under the deck or cut more floor from the top. I noticed in your pictures you were able to slide the new tank forward to the bow more than the original space allowed. Also for all those out there trying this...I used a come along to pull the tank free. Worked great especially since the tabs on the old tank are bolted down with SS screws and they are unable to reach.

-Marc
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