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  1. #1

    what would a crack in this hose do?

    Hey guys been working on a 1992 vxr. Had it up and running around 30 mph few months back but it had to be run on full choke at high rpms if choke was pushed in at all at high rpms it would kill the engine idleing was fine no prob there choke could be all the way in. Now my question is this i just found a crack in the gas line that goes from the carb to the top of the engine looks like a vacum line to me idk, not a mechanic but the carb has three gas lines two go to the tank one to the top of tank one to the fuel pickup in tank. So what is that third that goes to the engine? I already fixed it, just want to know what symptoms that might have put off as i cant take it to lake for a test run right now...


  2. #2
    Yamaha artisan Cutlass's Avatar
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    Its the pulse line. the air pressure from the crankcase pulses the fuel pump inside the carb to create fuel flow and pressure.

  3. #3
    That definatly sounds like a small crack in the line would make it run like it was.

  4. #4
    Yamaha artisan Cutlass's Avatar
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    definitely possible.

  5. #5
    Not to mention i had the pulse line hooked up to the fuel return line on the carb and the fuel return on the pulse dooooohhhh slaps forehead.

  6. #6
    silvercrxsir's Avatar
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    Usually the first big sign of a vacuum leak is having to use the choke to make it run

  7. #7
    Took it out today for about a hour and man oh man does that thing run! Thanks guys!

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