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Fuel drains out of tank when i start the engine

Hello everyone! I felt down from my bike, and the next day i started the engine.. a huge quantity of gasoline runs out of the fuel tank... the engine started fine, but it leaks fuel.. does anyone know what could be? thanks!

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More that likely when you fell the lines to the carb got damaged or partially disconnected and are leaking or the carbs(if it has carbs) has a stuck float which would allow fuel to over fill the bowl and pour out. The petcock is a vacuum controlled unit so that's why it does not put out any fuel until the engine is started (which is when it leaks). The tank may need to be lifted up some to see where the leak is coming from. If the lines are ruptured then replace them. If the carbs are leaking, tap on the bottom of the bowls with the back side of a wooden hammer (or something soft) and sometimes that will make them stop leaking.

Posted on Jan 17, 2013


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Posted on Jan 02, 2017

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SOURCE: Runs fine until bike warms up then misses

your cdi unit is suffering a from power surge try to check the output power if it is stable.

Posted on Apr 16, 2009

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SOURCE: 1995 honda cbr f3 wont start

I would think about investing in a carb re-build kit.

Posted on Dec 22, 2008

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SOURCE: Leaking fuel line

it may be the tank fitting...or the hose or the clamps.

Posted on Mar 13, 2009

  • 1 Answer

SOURCE: wet clutch

I just recently experienced the same thing.  I drained all the fluid out of the clutch master throught the slave cylinder and refilled it with new fluid.  Bled the system really good and now it works just like new.  If this does not help you may need to remove the slave cylinder and replace the seals if it is leaking.
Good luck1

Posted on Apr 25, 2009

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SOURCE: Starting The Bike On A Cold Morning

Try putting in new, stock spark plugs. Check and possibly replace the air filter. Charge the battery. Get the bike running then check the battery voltage at 2000 rpm. It should show 14volts or more. If not, get the charging system checked. Get a can of starting spray (for future problems).

Get the compression checked. Your bike is 21 years old and I will bet that the valves are needing to be reseated. Check the valve clearances with a cold engine and reset valve clearances as needed. Check the area where the head contacts th cylinder. Any mist of an oil stain? Tighten the head or replace the head gasket. If replacing the gasket, now is the time to have the shop lap re-seat the valves. Have them sync and balance the carbs as well. Your bike will now have its' manners back and show you the dedication it should.

Posted on May 29, 2009

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1 Answer

My hyosung wont start, it was running fine until it was parked in the shed for approx 3 months, now it wont start! It seems like a fuel problem, it will start and rev when we squirt fuel into the...

Hello and thanks for the question.
It sounds like the carbs are not getting fuel to the engine. This is common with the fuel that we get now. the fuel is not stable and can gum up quickly. I have seen carbs become clogged in as little as 60 days.

The first thing to do is drain the old fuel out of the tank and the carbs. There is a drain screw at the bottom of the carbs and you can drain the fuel out by loosening the screw. Make sure that you are carefull when draining the fuel out so that you dont have excess fuel leaking everywhere. I usually put a small container uinder the drains.

Syphon the fuel from the tank and replace with fresh fuel.

After all this is done try and start the bike and run on choke for a while. the fresh fuel can help to flush the old gas out. If the bike does not run properly the tank and carbs may need to be cleaned. The carbs are very detailed and should only be worked on by a qualified technician.
Thanks and I hope tht his helps.

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1. Have you recently replaced the air filter element?
2. Drain all fuel from tank, lines before installing renewed carburaetor then fill the bike again see what happend.
3. Make sure that when filling up no oter debris or dirt got into your tank.
4.Is your choke auto or manual? If manual ensure that it is normal after riding around as it foul up your air mixture ratio.
Good enough, please return a comment. Thanks

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try some aero start, starting spray, it may help work out what may be wrong.
Try a compression test
drain the carby bowls.though the little drain screws
Did it stop for any reason or it just wont start after it has sat for a time.?
What have you tried?

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try a little starting fluid in a carb see if fires if the bike fires up then dies then start checking for fuel line from tank to carb for flowing if it gets down to the carbs and not flowing (not sure if your bike includes a auto fuel shut off or not) but the problem could reside in this location otherwise there could be water in the fuel bowls in which case you drain the cups hope this helps to trace down your problem

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Hi and welcome to FixYa,

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The "quantity and quality of the fuel" would be indicative if the fuel is contaminated and/or if there is sufficient fuel in the carb's bowl to run the engine above 10 seconds. Checking for the presence / absence of spark after the engine quits would help you determine if it is an electrical problem or a fuel starvation issue.

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