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Dip tube / anti-siphon assembly and removal |
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brhillman 
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Joined: August-01-2021 Location: Snohomish WA Status: Offline Points: 62 |
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 Topic: Dip tube / anti-siphon assembly and removalPosted: September-23-2021 at 6:33pm |
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Hello all, been lurking for a while, just picked up a new to me 1989 ski nautique 2001 a couple weeks ago. In going through things after getting it home (and trying to diagnose a stalling issue at idle once the engine is warm), I pulled the fitting on the top of the fuel tank to check the anti-siphon valve and hopefully check the dip tube for debris. I was surprised when the dip tube did not actually come out with the fitting on the top, as it was my understanding that there should be a barb on the end of the fitting that the dip tube connects to, for example like the part available from Nautique Parts:
https://www.nautiqueparts.com/product/elbow-pickup-anti-siphon-valve/ Instead, if I look down the welded-in bung at the top of the tank (as best as I can with the tank in the boat by using a mirror with a flashlight), I see what looks like an aluminum cylinder fitting the opening maybe 1/2" or so down from the top. I suppose it is possible this broke off from the aluminum elbow when I removed it, it did require quite a bit of effort to break the threads free, and the barbed fitting with the anti-siphon spring and ball also actually broke off at the threads when trying to separate from the elbow (see photos). So my question is, how do I remove the dip tube for inspection/cleaning, given that it did not come out with the elbow fitting and appears to be beyond my reach down at the bottom of the tank bung? Is this a different design, perhaps it's threaded in from the bottom of the bung instead? Maybe I am misunderstanding how this is supposed to be assembled, and most of the threads I can find mentioning the dip tube on this site seem to have lost their attached photos. Thanks for any help or advice anyone can give, I'm very excited to join the community of Nautique owners on this site!    |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11090 |
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Posted: September-23-2021 at 7:36pm |
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I think you gave a perfect description of a 1989 SN gas tank with that bung welded in and the dip tube is in there for the duration
 I'd take an air hose and blow backwards through the tube to be sure it's free of junk and then get a new 90 degree fitting or get the broken part of the anti siphon valve out of the one you have and replace the broken anti siphon valve. Use a gas resistant sealer like Permatex 2 on the threads You could remove the level sender to get a look inside the tank if you wanted to. If the tube was clogged/restricted it would show up as a fuel starvation issue at high speeds, not at idle. It sounds more like a carburetor issue or a vacuum leak, if it only stalls at idle.
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brhillman
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Joined: August-01-2021 Location: Snohomish WA Status: Offline Points: 62 |
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Posted: September-23-2021 at 9:22pm |
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Ah, awesome thank you that's exactly what I needed to know! I won't be trying to remove the dip tube then and will back blow with air if needed, but vacuum leak or carburetor issue was what I suspected as well. Thank you!
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11090 |
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Posted: September-24-2021 at 6:06am |
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I think you'll find that the welded aluminum tanks are like that and the later plastic ones had the tube that was removeable
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: September-24-2021 at 6:49am |
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The other day I was talking with Charlie about thread sealants for gasolene. Since he's a retired steam fitter who's run miles of gasolene piping, I trust his opinion. The only stuff he ever used was Gasoila. It's not just resistant to gas like the Permatex 2 recommended but rather impervious to gas. Small tubes are even available:
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11090 |
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Posted: September-24-2021 at 7:35am |
So Pete I guess like everything else in the world, there are choices to be had when it comes to sealers. Lots more out there than Permatex or Gasoila that work equally well. I said to use something like Permatex 2. Didn't try to say it was the best in my opinion. Here's a picture of a couple of well used sealers on my workbench. Got some others too that were camera shy Look at that some Permatex right next to Gasoila. Which one I use might depend on my mood, the day of the week, what I might be using it on, or which one I grab first And by the way, in my opinion you should lern to spel Gasoline  |
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Mpost
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Joined: July-05-2018 Location: Monticello, MN Status: Offline Points: 329 |
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Posted: September-24-2021 at 9:00am |
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Just for you Ken
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84 SN Sold 98 SN Lund Pro V 1975 Alumacraft
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11090 |
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Posted: September-24-2021 at 9:27am |
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You're OK Marty I followed your instructions from the other day and rotated your picture 180 degrees to see if I could do it And will ya' look at that I just can't decide if I want to do that every time a picture decides to rotate itself  |
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8122pbrainard wrote: