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Author Topic: 98 Tourer Vapor Lock ?  (Read 134 times)
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nearly56
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« on: February 10, 2017, 07:30:33 AM »

I have about an hour commute. During the summer months I have run out of gas with around 1/2 a tank. I pulled over opened the tank and could see gas. I left the cap open and was able to start and make it home.
This in an intermittent problem. now it happened in February ? I was low on fuel, 135 miles on a tank, I turned on the reserve, and no fuel. rolled to a safe place to stop and opened tank. Again was able to start and make it home.

Any ideas ?
thanks,
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WintrSol
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« Reply #1 on: February 10, 2017, 10:26:08 AM »

I think you have a blockage in the tank vent, causing the pressure in the tank to drop as the fuel is used. Is this a California model?
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Florissant, MO

Rides: 1998 Honda Valkyrie GL1500CT Tourer + 1970 Honda CB450 + 2005 Suzuki VS800GL
nearly56
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« Reply #2 on: February 10, 2017, 12:39:56 PM »

No It isn't. I de-smogged the Valk 4-5 years ago
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WintrSol
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« Reply #3 on: February 10, 2017, 02:18:55 PM »

OK, I only asked, because the tank is vented through a vapor canister in the CA model, so the probable causes get more complicated. I this case, I would check out the fuel cap, to see if the seal is in good condition, and nothing is blocking the fuel tank breather tube.

Are you still using the stock fuel petcock? It is vacuum operated (from #6 carb), and could be failing, too.
« Last Edit: February 10, 2017, 02:33:40 PM by WintrSol » Logged

Florissant, MO

Rides: 1998 Honda Valkyrie GL1500CT Tourer + 1970 Honda CB450 + 2005 Suzuki VS800GL
nearly56
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« Reply #4 on: February 10, 2017, 04:53:42 PM »

I rebuilt it about 5 years ago
maybe it's the problem but it works well otherwise
Gasket to tank cap appears to be ok...
Breather tube isn't something I can blow air through, how would I test it
thanks again
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WintrSol
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« Reply #5 on: February 10, 2017, 05:54:24 PM »

If I recall, to test the breather tube, you have to remove the tank, but I'm not sure. It is mentioned in the service manual troubleshooting charts, but, unfortunately, does not appear in any of the drawings or photos. It's been a while since I had my tank off, and that wasn't the focus of its removal (was working the carbs). I believe the breather tube is run inside the tank, with an opening near the top of the tank, and a bit of tubing reaching out the bottom for a bit of tubing to be attached. I think this is one of the three tubes that reach the bottom of the bike near the right foot peg.
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Florissant, MO

Rides: 1998 Honda Valkyrie GL1500CT Tourer + 1970 Honda CB450 + 2005 Suzuki VS800GL
JetDriver
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« Reply #6 on: February 11, 2017, 09:25:15 AM »

Near the back of the tank, 4 or 5" aft of the petcock assembly, is a rubber vent tube.  It is #29 in the diagram.  It has a "T" in the middle of the line (#2).  The "T" is just open to the atmosphere.  Make sure the line doesn't have a kink in it, and the "T" is not blocked.

http://www.hondapartshouse.com/oemparts/a/hon/5054120ff870021c54bee67b/fuel-tank
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nearly56
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« Reply #7 on: February 11, 2017, 09:58:55 AM »

Thanks ! will check this next
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