Fuel Leak or Operator Error / Ignorance
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Thread: Fuel Leak or Operator Error / Ignorance

  1. #1
    Member M C Toyer's Avatar
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    Fuel Leak or Operator Error / Ignorance

    About a month ago I filled the tank and parked my TW in the shop. Recently I noticed a wet spot on the gravel floor.

    I thought the leak was from filling the tank when vertical and leaking from the cap when parked but discovered the tank was nearly drained. (Discovered by running fully dry a few miles from home). I may have left the switch on Reserve when I filled and parked.

    Would this cause all the fuel excerpt the Reserve to leak out or should I be looking for another cause?

    M C
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    Senior Member Leisure Time Larry's Avatar
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    Yeah, if you left the petcock in the ON or RES position when parking, and your float needle doesn't have a good seal, it sure could've all leaked out. Hopefully, it all just leaked out of the carb overflow onto the ground, but I would check to make sure none made its way into the engine oil or the airbox.

    If you change your needle and seat inside of the carb, be sure to read up in the technical write-up section so you don't break off a float post.

    Good luck!
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    Ken
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    I filled up a crankcase twice with gasoline so I make sure I turn the petcock off. It did remove a lot of sludge so it was actually good that it happened and even better that I caught it before starting. I read about it exploding the oil pan off. That was on my Radian. The ethanol gas doesn't seem to be good for the needle valve.
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    Senior Member admiral's Avatar
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    Quote Originally Posted by Leisure Time Larry View Post
    Yeah, if you left the petcock in the ON or RES position when parking, and your float needle doesn't have a good seal, it sure could've all leaked out. Hopefully, it all just leaked out of the carb overflow onto the ground, but I would check to make sure none made its way into the engine oil or the airbox.

    If you change your needle and seat inside of the carb, be sure to read up in the technical write-up section so you don't break off a float post.

    Good luck!

    In addition to what LTL mentions about the float needle, I had a bad O-ring on my needle valve seat which also allowed fuel to enter the float bowl (and beyond) onto the floor/ground.

    Both the float needle valve and needle valve seat are shown in the photo below courtesy of forum member jbfla's carb photos.



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    Senior Member phelonius's Avatar
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    Last year I had a puddle of gas under my Honda in the garage.
    My problem was radiating cracks from around a mounting bolt of the tank. I had to buy a new gas tank.
    Check for cracks. Clean the tank and dust the suspect areas with talcum powder. A wet spot should soon show if it is leaking.
    If you have no talcum, flour will work too.
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    Phelonius

  7. #6
    Senior Member SportsterDoc's Avatar
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    Excellent replies from Larry, Ken, Admiral and Phelonius.
    If not a tank issue, either the fuel vented from the carb or went into the crankcase.
    Does the crankcase smell of gasoline?

    MC, how did the Triumph jacket work out?
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    Member M C Toyer's Avatar
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    Thanks guys. Looks like I've got some work before I play.

    Never even thought about fuel in the crankcase.

    In my younger days, when I had an excuse for ignorance, had a fuel pump diaphragm rip in a slant 4 Pontiac Tempest. The superheated fuel in the crankcase was forcing oil out the breather which was collecting on the rear tires which were nearly bald. The front engine Tempest had a Corvair transaxle in the rear and though not as prone to over-steer, was still a pretty wild ride with near zero traction.
    Last edited by M C Toyer; 02-15-2018 at 08:05 PM.
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    Member M C Toyer's Avatar
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    Quote Originally Posted by SportsterDoc View Post

    MC, how did the Triumph jacket work out?
    Great! Perfect fit. I've worn it several times this winter with all the armor and liner, then just the shell when not riding. This week it's been in the 80s so I've gone bare.

  10. #9
    Senior Member RockyTFS's Avatar
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    Quote Originally Posted by M C Toyer View Post
    .....
    Would this cause all the fuel excerpt the Reserve to leak out or should I be looking for another cause?
    See this thread: https://tw200forum.com/forum/technica...carb-leak.html

    Most likely the same problem.

    And it is VERY likely most of that gas ended up in the oil.
    Rocky
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  11. #10
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by M C Toyer View Post
    Great! Perfect fit. I've worn it several times this winter with all the armor and liner, then just the shell when not riding. This week it's been in the 80s so I've gone bare.
    Great! Here, in the summer, it is down to gloves, a long sleeve T shirt, jeans and boots.
    Last edited by SportsterDoc; 02-16-2018 at 09:57 AM.
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

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