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  1. #1
    liquidmilitia.com rxp127's Avatar
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    2001 Virage700 Wont Start

    Hey guys, its a 2001 Virage 700. The ski will start when we spray starting fluid but will eventually die. The carb is not getting any fuel. I checked pulse line and its working. Carbs were rebuilt recently. Fuel filter in carb was inspected and cleaned. I suck fuel through the main line and it flows with no problem but as soon as I connect it to the carb it doesn't suck up any fuel. Where can I start looking for the leak?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Air leak in the fuel selector valve?

    Either the fuel pump is not actually pumping fuel, or somewhere between fuel tank nipple and fuel pump inlet there is an air leak in the hose system.

    Carb rebuild recently? Could the rebuild for the fuel pump have been done incorrectly? Has the pulse line from the crank case been connected to the correct fitting on the carb?

    BTW, that engine is a 700, not 760

  3. #3
    liquidmilitia.com rxp127's Avatar
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    Quote Originally Posted by k447 View Post
    air leak in the fuel selector valve? I will check that tonight.

    Either the fuel pump is not actually pumping fuel, or somewhere between fuel tank nipple and fuel pump inlet there is an air leak in the hose system. No leaks there.

    Carb rebuild recently? Could the rebuild for the fuel pump have been done incorrectly? I was told it was checked twice and it was good. Has the pulse line from the crank case been connected to the correct fitting on the carb? Yea everything is where it should be.

    Btw, that engine is a 700, not 760
    thanks for the clearing that up =)

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    Click avatar for tech links/info, donation request K447's Avatar
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    There just are not that many parts to the fuel system.

    If the carb really is correctly put together and all the hoses are hooked up correctly then it should pump fuel and run. Since it doesn't, something is wrong. You just need to find it.

  5. #5
    liquidmilitia.com rxp127's Avatar
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    I was told the owner pulled the carbs off more than 5 times and used the sam gasket over and over, where the carb meets the manifold. Also i noticed the flame arrestor bracket is missing a gasket. Can either of those cause an issue?

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by rxp127 View Post
    I was told the owner pulled the carbs off more than 5 times and used the same gasket over and over, where the carb meets the manifold.

    Also i noticed the flame arrestor bracket is missing a gasket.

    Can either of those cause an issue?
    Well, you do need a decent seal between the carb and the intake manifold.

    The seal between carb and flame arrestor base is not so important.

    Sounds like there have been several sets of hands working on this engine. How can you be sure everything has been put together correctly?

  7. #7

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    Pull the carbs. If everything that you say is working, I'd bet $ the check valves in the fuel pumps are damaged.

  8. #8
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    Make sure you have the hoses to the carbs connected correctly. The top fitting is the return line to the fuel tank. The lowest is from the fuel tanl, and the one in the middle is the crankcase pulse line.

    Get a piece of fuel line and bypass the fuel selector / on-off knob and run a line directly from the fuel tank to the carburetor input. Before attaching it, blow into the line and make sure you are blowing air into the bottom of the fuel tank. This will verify that you have the fuel "pick-up" line and not the fuel return.

    The check valves do break, but the fuel check valve is aluminum and is very durable. You will most likely need a special torx tool to access it.

    Regards,
    Randy

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Watcon View Post
    ... The check valves do break, but the fuel check valve is aluminum and is very durable. You will most likely need a special Torx tool to access it...
    Which aluminum valve are you referring to? The fuel selector valve?

  10. #10

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    He's referring to the valve in the pump assembly. He's right too, I had a brain fart and had Mikuni on the mind (plastic check valves)

    The Keihin's have the aluminum valves...

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