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Old 04-11-2015, 05:23 AM   #1
Dan Alexander OP
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Yamaha wont run if tank is less than half full?

Posting for a friend, don't know all the details but he's stumped.

He's working on a XSV1100 and the bike won't run with less than half a tank.

Anybody heard of such a thing??
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Old 04-11-2015, 05:36 AM   #2
Cogswell
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Fuel pick up in the tank or petcock may be clogged. Remove it from the tank and have a look.


Mike
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Old 04-11-2015, 06:02 AM   #3
Scudman
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Quote:
Originally Posted by Cogswell View Post
Fuel pick up in the tank or petcock may be clogged. Remove it from the tank and have a look.


Mike
His fuel pump is not working. The fuel will gravity feed into the carburetors until the level of fuel falls below the level of the carburetors.
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Old 04-11-2015, 07:39 AM   #4
dave0
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Gas cap vent is clogged.
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Old 04-11-2015, 07:40 AM   #5
dave0
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Originally Posted by Scudman View Post
His fuel pump is not working. The fuel will gravity feed into the carburetors until the level of fuel falls below the level of the carburetors.
Check the gas cap vent. Might be clogged.
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Old 04-11-2015, 08:29 AM   #6
Dan Alexander OP
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I asked him if he tried with the cap open but haven't heard back.

I've passed along these ideas, thanks guys.
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Beemers Past and Present: 74 R90S, 77 R100RS, 85 K100RS, 2x 87 K100RS, 96 R1100GS (getting hacked), 99 R1100S, 2002 R1150GS, 2005 F650 Dakar, 81 GL500/Velorex
Plus the occasional Triumph, BSA, Yamaha, Honda, Suzuki and KTM but who's counting
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Old 04-11-2015, 09:29 AM   #7
Tim McKittrick
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I had the same issue with a BMW R100- the cause was partially clogged aftermarket fuel filters. They were those clear tapered units with the brass amalgam filters, and while they looked just fine they would only flow enough fuel if there was sufficent "head pressure", IE a full tank of gas. Replacing the filters solved the problem.
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