K11 Owners Group

molerat · Posted: Wed Oct 26, 2016 8:58 pm Post subject: fuel leak

Hi All,
I haven't been on in a while for personal reasons and because of that haven't ridden in quite a while.
Anyway, I'm back on the bike. I was riding over the weekend and noticed fuel leaking from a hose that drains on the right side of the bike. It leaks fairly quickly and will pool up to quite a few dozen drops at a stop light.
I plan on removing the tank this weekend and look at it, but was looking for some advice on what to look for if anyone else had a similar problem.

Thanks in advance.
_________________
Brian

1995 K1100 LT
1952 HRD Vincent Black Shadow, Series C

Scott_Anderson · Posted: Wed Oct 26, 2016 10:48 pm Post subject:

Did you just fill the tank?
Not uncommon if you overfill.
_________________
Ride safe.

1995 K1100LT 0302044
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
1997 R1100RT ZC62149(sold)

N41EF · Posted: Thu Oct 27, 2016 9:42 am Post subject:

If your bike has the "cup" installed, there is one drain line, otherwise there are two. One drain line drains the water from around the fuel cap when it rains, the other is the overflow vent line from the tank.. As mentioned above, if you fill the tank completely (flapper removed) and the tank heats up, fuel expands and can overflow.
_________________
2014 R1200RT Water Cooled
2001 R1100S Light
1993 K1100LT. Nissan Ice Blue.(Gone)

molerat · Posted: Thu Oct 27, 2016 7:52 pm Post subject:

I only had about 3 gallons in it.
I removed the cup a while ago if you are referring to the piece under the filler cap.
I failed to mention (if it helps), I had trouble starting it about a week earlier in fact it failed to start at all. It kept turning over but never fired like no spark was getting to the plugs or fuel to the cylinders. I searched the board for these types of issues and found some good stuff, but didn't have to worry about it cause eventually it started after trying several different times over the course of a few days.. Its been starting great since.
_________________
Brian

1995 K1100 LT
1952 HRD Vincent Black Shadow, Series C

Jim · Posted: Thu Oct 27, 2016 8:16 pm Post subject:

The piece under the cap is the flapper.

The cup (air accumulator) is right under the right rear corner of the tank - where the 2 vent nipples come out of the tank.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

molerat · Posted: Thu Oct 27, 2016 8:26 pm Post subject:

Jim · Posted: Thu Oct 27, 2016 9:50 pm Post subject:

I had the same problem when I was out west in the heat.

There is a TSB (technical service bulletin) for this issue. The problem is that unused gas that is returned from the injectors is spraying out of a little nozzle on the "shed biscuit" - under the right conditions, the gas that sprays out gets picked up by the vent and comes out the drain hose. The shed biscuit is forward of the gas cap in the top of the tank.

The fix is to put a length of gasolene resistant hose on that little nipple on the shed biscuit - use a stainless screw type clamp. I forget the exact length specified in the TSB - maybe about 29 cm. I think it was actually 29.+ cm. The loose end of the hose has to lay down near the pump. This ensures that return fuel is not spraying around the tank, but is being squirted back into the gas in the tank. You need enough hose to reach all the way down by the pump - then zip tie the hose to one of the metal tubes down there.

If Julius at Gina's hadn't been such a freak about keeping people out of the shop, I'd have pictures for you
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Scott_Anderson · Posted: Thu Oct 27, 2016 10:29 pm Post subject:

Molerat, I have 2 tsb's in pdf format I'll drop to you in an e-mail. Read them over and see if you think you want to attempt them.
_________________
Ride safe.

1995 K1100LT 0302044
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
1997 R1100RT ZC62149(sold)

molerat · Posted: Fri Oct 28, 2016 6:51 pm Post subject:

Hey Guys,

Thanks for all that information it looks promising, I printed it up and if I have time this weekend will give it a go. I really hope it works.
Is it a difficult procedure? It doesn't look to hard except for working in areas you can't see.

Question: Can I can skip the part of bending the fuel line and just install the new hose from the shed biscuit to the bottom of the tank, I've never had issues with running out of fuel with a lot of fuel still in the tank.

This site rocks and everyone is so helpful, and oh I changed my signature by adding my name, Brian. I may have had a case of the brown bottle flu when I created the account. Shocked

_________________
Brian

1995 K1100 LT
1952 HRD Vincent Black Shadow, Series C

Jim · Posted: Sat Oct 29, 2016 12:32 am Post subject:

Hey Brian - I think the reason the nipple needs to be moved a bit is that you can't get a hose and clamp on it the way it's pointed now. Not sure - it's been awhile.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

molerat · Posted: Sun Nov 13, 2016 5:41 pm Post subject:

[quote="Jim"]Hey Brian - I think the reason the nipple needs to be moved a bit is that you can't get a hose and clamp on it the way it's pointed now. Not sure - it's been awhile.[/quote

Update guys,
Thanks again for the info. Jim I was able to get the hose and clamp on without moving the nipple in fact it really wasn't even close. i routed the hose down toward the left back of the tank.
Not sure it's worked though, it's not as hot here as it was, if that has anything to do with it. I'll keep an eye on it and keep you updated.

Brian
_________________
Brian

1995 K1100 LT
1952 HRD Vincent Black Shadow, Series C

Jim · Posted: Sun Nov 13, 2016 8:23 pm Post subject:

Heat definitely has something to do with it - or at least it did with my problem.

The hose on mine is routed back down toward the pump, and zip tied to one of the metal lines down there.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."