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Help/advice on fuel lines

After a ride yesterday (2004 BCR, 29000 miles), I noticed that there was a gurgling sound coming from the gas tank. After an hour or more, it stopped. Started the bike and ran for a few minutes and again heard the gurgling noise but only lasted for about 15 min.

I disassembled body work and removed the filler neck and could a steady stream of tiny bubbles originating from the fuel pump side of the tank. I'm assuming one of the in-tank vent hoses has a leak but I don't understand why air would leak into the tank. I thought both lines were vent lines to allow gas/pressure out. With pressure equalized by opening the filler neck, why would I see bubbles?

The fuel pump is original and I replaced the filter and fuel pump hoses (used the ones from Beemer Boneyard) about a 1.5 yers ago. I plan on replacing the in-tank vent hoses but wondering if I should be checking something else while everything is apart.

Thanks
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'04 R1100S BCR, '07 F800S (sold), '04 R1100S (totaled), '15 Thruxton (sold),'90 NT650 (sold), '86 SRX6 (sold - worse decision I ever made)
Old 05-27-2018, 01:47 AM
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Is gas dripping below the bike? Does your bike have the vent canister still?

I had a hard time finding fuel line to replace the two vent lines, finally went to a local Big Box Motorcycle dealer, their parts guy had 5mm fuel line and I replaced all of my vent line. My vent lie inside the tank cracked down where it bends to go through the fuel pump plate. it was allowing gas to drip about a drop every 30 minutes. Enough to drain a whole tank in 6 weeks.
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Old 05-27-2018, 07:09 AM
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No longer have the canister. One of the vent lines was wet with gas but not dripping.
I'll see how things look whe I pull the pump and lines.
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'04 R1100S BCR, '07 F800S (sold), '04 R1100S (totaled), '15 Thruxton (sold),'90 NT650 (sold), '86 SRX6 (sold - worse decision I ever made)
Old 05-27-2018, 11:10 AM
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There are two vent lines that run through the tank. One goes from the gas cap drain on the left side of the bike. One runs from the high point vent. They both come down through the fuel pump plate, then again down to the canister or to the ground. BMW wants $48 per meter for them because they are exposed to fuel inside and out.
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Old 05-27-2018, 12:18 PM
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Mine also makes a gurgling sound after a ride.
My thinking was that as the gasoline (petro) goes out, it's being replaced by the outside air going in.
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Old 05-27-2018, 06:46 PM
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Thanks for the replies. In the 4 years I've owned the bike, it has never made this sound. The gurgling is not constant, but rather a gurgling/burping sound every 10 sec or so that becomes less frequent with time until it stops.

I pulled everything apart and can't find a problem. All hoses seem fine and the hose clamps tight. Not ruling out a pin hole in the lines, but I can't find it. Also vent hoses were not clogged. Since I have a couple of long trips planed this summer, I'm going to replace all in-tank hoses, filter and pump (BB has a kit that is reasonably priced).

I hate throwing money and new parts at a problem I can't diagnose, but I don't see an alternative.
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'04 R1100S BCR, '07 F800S (sold), '04 R1100S (totaled), '15 Thruxton (sold),'90 NT650 (sold), '86 SRX6 (sold - worse decision I ever made)
Old 05-28-2018, 01:52 AM
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Mine has gurgled since I have owned it.
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Old 05-28-2018, 02:55 AM
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You can measure the return flow of fuel back to the tank. At idle it should be about 2 liters per minute. If is appreciably lower (or higher) you have a problem. By measuring you can keep from throwing parts at it. Here’s a link: R1150 Fuel System Diagnostic Tool - BMWSportTouring Forums
Old 05-28-2018, 04:08 AM
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Thanks for that link Roger. I've had two R11S's and have riden with a half dozen others over the years. Never heard one make a gurgling sound after riding.
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'04 R1100S BCR, '07 F800S (sold), '04 R1100S (totaled), '15 Thruxton (sold),'90 NT650 (sold), '86 SRX6 (sold - worse decision I ever made)
Old 05-28-2018, 05:40 AM
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Quote:
Originally Posted by wswartzwel View Post
Mine has gurgled since I have owned it.
Arkansas crawdads in your belly...
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cRaIg CaRr
2000 R1100S, 2000 Dyna FXDX, 2015 rNineT. 2016 F800GS, 2016 Jeep Rubicon. 2001 Corvette, 1978 Porsche 928. Schwinn Homegrown MTB & Fastback Road Bike. 22 pairs of shoes. 44 bottles of beer.
Time Marches On: 2015 F800GS, 2010 F800GS, 2007 R1200S, 2003 Dakar, Buell 1125r, 2001 F650GS. 1999 F650. 1998 HD Sportster Sport. 2010 F150, 1995 GMC Sierra ALL GONE
Old 05-28-2018, 05:47 AM
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