Question about 1999 Yamaha XV 535 Virago DX

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Engine filling up with gas

Anybody have this problem in the past? Just contaminated a second batch of fresh oil and filter when I tried to start the bike. Thought the problem was a disconnected fuel line in the tank, which I fixed. It all started when the bike died on the road. WhenI got it home to try and start it the starter would turn over at first, but eventually it would not despite a charged battery. I then realized the engine was filling with gas everytime I tried to turn it over, fuel was leaking from thelower exhaust pipe and the site glass was void of any air. I opened up the drain plug and a ton of oil and gas came out. I refilled the crankcase and the motor at first turned over until I realized gas was again leaking from the lower exhaust pipe. I disconnected the fuel lines and electrical under the tank and hit the starter switch again. The motor started and ran for a few moments before depleting the fuel that was left in the lines. That told me I have spark but for some reason gas was gushing into the cylinders at a high rate, flooding the engine. I made no more attempts to start the motor out of concern doing that would damage it.

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  • Anonymous Apr 15, 2009

    i have the same thing goin on you have a float problem or your fuel pump diaphram is cracked allowing fuel into the crankcase

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There is no way for fuel to get passed the rings right? So if you filled the head with fuel, it would just work its way down the exhaust pipe and out the back, just like its doing. The only way of getting fuel into the sump is; if you have seriously bad rings (it would be burning oil) OR if its getting through the breather system. I don't even think if the injectors were on full-time, it still wouldn't get into the sump... very strange. Are you sure its not coolant? A serious coolant leak can be completely unnoticeable from the outside, but catastrophic to the inside. __________________

Posted on Nov 10, 2008

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It sounds like your float level is off.I'm going to say the float on one of your cars has come loose from the float needle and with that model it has a electric fuel pump ,so with the float not shutting off it is steadly pumping gas into the bowl on the carb and running past into the cylinder through intake to fill it. Some will run past the rings into the crankcase , no rings will completely seal a cylinder hence the fuel mixed with your oil.

Posted on Mar 27, 2009

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Buy a japanese bike

Posted on Jun 05, 2009

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SOURCE: Engine filling up with gas

there is no way for fuel to get passed the rings right? So if you filled the head with fuel, it would just work its way down the exhaust pipe and out the back, just like its doing. The only way of getting fuel into the sump is; if you have seriously bad rings (it would be burning oil) OR if its getting through the breather system. I don't even think if the injectors were on full-time, it still wouldn't get into the sump... very strange. Are you sure its not coolant? A serious coolant leak can be completely unnoticeable from the outside, but catastrophic to the inside. __________________

Posted on Nov 10, 2008

  • 1 Answer

SOURCE: Engine filling up with gas

The carburetor float is not closing off completely. The fuel fills carb bowl, leaks into crackcase (Yes, fuel will flow past the rings) via intake or crackcase vents. Install fuel cutoff valve at tank and rebuild carb.

Posted on Feb 21, 2009

  • 1 Answer

SOURCE: Engine filling up with gas

Hi, a friend of mine had the same problem with his old gs750. In his case it turned out to be a damaged diaphram rubber in the petrol valve. In addition to this he also had a bad needle and seat in one of the carb bowls. With both these faults the petrol flow could not be shut off, so gravity took over and filled the crankcase. hope this helps, Bikemanbig.

Posted on Apr 15, 2009

  • 6 Answers

SOURCE: Engine filling up with gas

gsxr's are known for this problem, you left the petlock on run which will seep petrol through your rings, on the on position no fuel escapes because you need a vacuum to start the fuel moving

Posted on Jul 10, 2009

  • 1 Answer

SOURCE: Engine filling up with gas

the guy is right! I have had the same problem with my dr750 flooding the crankcase with FUEL!, have used two sets of carbs on it now, both with same result! fuel/oil mix in the crank which when run streams up the breather into the air box! weird one as the bike ran fine for a week with both sets of carbs before doing this. I have tried so many things but am still baffled!

Posted on Dec 29, 2009

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Engine filling up with gas


there is no way for fuel to get passed the rings right? So if you filled the head with fuel, it would just work its way down the exhaust pipe and out the back, just like its doing. The only way of getting fuel into the sump is; if you have seriously bad rings (it would be burning oil) OR if its getting through the breather system. I don't even think if the injectors were on full-time, it still wouldn't get into the sump... very strange. Are you sure its not coolant? A serious coolant leak can be completely unnoticeable from the outside, but catastrophic to the inside. __________________

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Engine filling up with gas


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Engine filling up with gas


which I fixed. It all started when the bike died on the road. WhenI got it home to try and start it the starter would turn over at first but eventually it would not despite a charged battery. I then realized the engine was filling with gas everytime I tried to turn it over fuel was leaking from thelower exhaust pipe and the site glass was void of any air. I opened up the drain plug and a ton of oil and gas came out. I refilled the crankcase and the motor at first turned over until I realized gas was again leaking from the lower exhaust pipe. I disconnected the fuel lines and electrical under the tank and hit the starter switch again. The motor started and ran for a few moments before depleting the fuel that was left in the lines. That told me I have spark but for some reason gas was gushing into the cylinders at a high rate flooding the engine. I made no more attempts to start the motor out of concern doing that would damage it.,there is no way for fuel to get passed the rings right? So if you filled the head with fuel, it would just work its way down the exhaust pipe and out the back, just like its doing. The only way of getting fuel into the sump is; if you have seriously bad rings (it would be burning oil) OR if its getting through the breather system. I don't even think if the injectors were on full-time, it still wouldn't get into the sump... very strange. Are you sure its not coolant? A serious coolant leak can be completely unnoticeable from the outside, but catastrophic to the inside. __________________,,,

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