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Fuel Tank Water Drain Pipe Blocked

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NevadaJohn View Drop Down
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    Posted: 17 Aug 2019 at 07:59
Recently I noticed that rain water was pooling at the 6 o’clock position on the fuel filler surround where there is a small cut out. Removing the 5 Allen bolts releases the filler trim from the rank and reveals a small drain that leads to a convoluted pipe that bypasses the interior of the tank and vents out into a nitrile rubber tube that runs down the back of the engine. This system is designed to collect any water before it enters the fuel tank. On my 2013 Nevada 750 this is blocked and I have managed to suck out some rusty water with a syringe. It doesn’t drain and I suspect I have had some water in the fuel that I am dealing with separately. But the current issue is how to I unblock this drain tube? I have some fine with.e and monofilament but I can’t get it more than a couple of cm into the tube. Once inside the tank the tube curls around rather like the U bend in domestic plumbing. I suspect this is where the blockage is. Penetrating oil hasn’t helped. I just can’t get anything past it. Regarding suspected fuel contamination, I’ve siphoned out almost all of the fuel and will fill up with 100 octane and add fuel conditioner to see how that improves things. Has anyone had experience of this or does anyone have any ideas?
Nevada John
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NevadaJohn View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NevadaJohn Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 2019 at 08:05
Sorry about the few typos that I didn’t pick up. Hope you can fill in the gaps. 
Nevada John
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 2019 at 10:47
Take the tank off and remove the tube from the underside. Then you can get a small drill bit up into the ferrule which goes through the tank skin. That's where the blockage usually is.
Brian.

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NevadaJohn View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NevadaJohn Quote  Post ReplyReply Direct Link To This Post Posted: 18 Aug 2019 at 23:24
Thanks Brian. That’s very helpful advice. 
I’ll get on to it.
Nevada John
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NevadaJohn View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NevadaJohn Quote  Post ReplyReply Direct Link To This Post Posted: 19 Aug 2019 at 07:10
But until I get around to it, in the meantime I'm going to try to stop the rain entering the tank by covering the filler cap area. I have some old tank top magnets that I'll use to make some sort of cover. 
I try not to dismantle the bike when the weather is so inviting. 
Nevada John
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 19 Aug 2019 at 07:31
Plastic sheet held on by magnets should keep the water out.
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NevadaJohn View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NevadaJohn Quote  Post ReplyReply Direct Link To This Post Posted: 19 Aug 2019 at 08:07
Thanks again Brian. I’ll sort something out and let you know!
Oh the joys of Guzzidom 
Nevada John
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NevadaJohn Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 2020 at 11:44
Well folks it has been a while since I reported my water in fuel tank issue. Pleased to report the blockage has been cleared after much agonising. Tank off, welding rods and small diam throttle cable from exit to entry. Same procedure from top end. A bit like the channel tunnel. Both end twiddling with copious plus gas eventually cleared out rusty debris. Will purchase some Lear Chemicals Corrosion Block to apply regularly to the top hole after removing filler surround. Top tip: plug the tank filler hole in case you drop something like an Allen bolt or washer. 
I’ve decided to use my home made tank top cover whenever it rains as I can’t see myself going through all of this again!
Nevada John
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bugsy Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 2020 at 16:23
Bit late now I know but on my Breva I undid the rear tank bolt, pulled the tank back a bit and lifted the rear which proved sufficient to get my hand under the tank, release the drain pipe and twirl a drill up the offending ferrule. Quite quick and easy to do compared with full tank removal. Hasn't corroded again but then I don't get out much... Unhappy
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