Question about 1999 Yamaha YZF-R6

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LEAK OF GAS AND OIL FROM UNDERNEATH MANIFOLD

My motorcycle starts, for about 3 or 4 minutes, at this time it smells a lot like gasoline, but when I looked at it close it also has an oily texture.

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Better check the oil and see if gas has gotten into the crankcase. If it has then change the oil and filter and don't start the engine till you do so. Gas in the crankcase will destroy bearing and seals fast.

Posted on Sep 29, 2009

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Posted on Jan 02, 2017

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Why am I getting gas in oil pan


  1. Minor Amount of Gas
    • The piston rings are seals placed tightly against the cylinder walls. These piston ring seals prevent the gasoline from flowing past the pistons and down into the oil. They do not, however, provide a perfect seal; thus, a slight amount of gas will find its way into the oil as a normal occurrence. This amount should be extremely minute, and such a small amount does not change the oil enough to cause any damage. Changing your oil every 3,000 to 5,000 miles or every three to five months ensures that it does not become a problem.
      Two ways to tell if you may have a problem with gas in your engine oil are:
      1. If you start to smell a strong odor of gasoline while you are driving.
      2. You notice white smoke coming out of your tailpipe.
      If a large amount of gasoline does get into the engine oil, change the oil immediately upon fixing the problem that has allowed this to happen.
    Excessive Fuel
    • When a fuel injector is stuck open, the fuel will flood out. Gasoline will definitely get into the oil when this is the case.
      If the fuel pressure in your car is too high (above 7 psi) that may cause gasoline to get into the engine oil.
      Gas could also leak into your intake manifold if there is a carburetor problem.
      An inoperative injector system can also cause this problem, because if the engine is not firing appropriately, the gasoline will end up running down the walls of the cylinders.
      Check to see if the float in the gas tank is rising the way it should be rising or if it needs an adjustment. You will not be able to look at your gas gauge and get an accurate reading If the float is not functioning properly.
      Your engine may be running rich, with too much gas going into the engine and too little air.
      Check to see if the oil level might be really high. This can also cause trouble.
    Check Piston Rings First
    • Any time you realize that too much gas is getting into your engine oil, you should replace the piston rings and then replace the oil. See if this helps the problem, and if it does not, then investigate the many other possibilities as to why the fuel is leaking into the oil.
      Perhaps at this point do a compression test. Otherwise you can try getting your fuel injectors tested. Also check your spark plugs to see if they are good or if they might be misfiring.


Read more : http://www.ehow.com/how-does_5003081_gas-engine-oil.html

Jan 14, 2015 | Cars & Trucks

1 Answer

Why is there gas in the oil of my 1983 goldwing


Hi, Anonymous you're getting ready to go riding you pull out the dipstick to check your oil level and are greeted with the unmistakable smell of gasoline. What happens next depends on the following:
1. You have experienced this before and do not start the engine but do change your oil and filter leaving it 1 quart low until the engine reaches operating temperature then top off as necessary.
2. The amount of time your bike has been sitting since the last time the engine was running.
3. The amount of gas and contaminants in the tank.
4. The oil pump location, exterior or interior.
5. The condition of your petcock gasket/seal/diaphragm.
If your gas tank was low and you start the engine probably nothing you would notice but if your gas tank was full and you start your engine the oil/gas mixture can blow into your air filter, come streaming out of your crankcase breather hose, and launch your oil tank cap followed by a blast of oil. The mess can be minor or you need to call a Hazmat team for assistance. This will also happen if you overfill your oil tank.
Next is the how and why gas can get into your oil tank/system:
a. The vacuum petcock rubber/diaphragm fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until contaminants from the gas tank build up in between the carburetor needle and seat breaking the seal thus inviting gas to enter the combustion chamber eventually finding it's way into the bottom end and the oil tank.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
oil has gas smell GL1100 Information Questions goldwingdocs com
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Honda GoldWing GL1100 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda Gold Wing GL1100 Owner Manual

Jun 16, 2014 | 1983 Honda GL 1100 Innerstate Gold Wing

1 Answer

2001 Triumph Legend TT engine oil flooding with petrol


Hi, Malcolm you're getting ready to go riding you pull out the dipstick to check your oil level and are greeted with the unmistakable smell of gasoline. What happens next depends on the following:
1. You have experienced this before and do not start the engine but do change your oil and filter leaving it 1 quart low until the engine reaches operating temperature then top off as necessary.
2. The amount of time your bike has been sitting since the last time the engine was running.
3. The amount of gas and contaminants in the tank.
4. The oil pump location, exterior or interior.
5. The condition of your petcock gasket/seal/diaphragm.
If your gas tank was low and you start the engine probably nothing you would notice but if your gas tank was full and you start your engine the oil/gas mixture can blow into your air filter, come streaming out of your crankcase breather hose, and launch your oil tank cap followed by a blast of oil. The mess can be minor or you need to call a Hazmat team for assistance. This will also happen if you overfill your oil tank.
Next is the how and why gas can get into your oil tank/system:
a. The vacuum petcock rubber/diaphragm fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until contaminants from the gas tank build up in between the carburetor needle and seat breaking the seal thus inviting gas to enter the combustion chamber eventually finding it's way into the bottom end and the oil tank.
4. Bottom line if you're not going to ride your bike for a while turn off the petcock.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Jul 05, 2017 | 2001 Triumph Legend TT

1 Answer

Honda 2004 CBR 125 R with 50,000 km smell of petrol in the oil


Hi, Anonymous you're getting ready to go riding you pull out the dipstick to check your oil level and are greeted with the unmistakable smell of gasoline. What happens next depends on the following:
1. You have experienced this before and do not start the engine but do change your oil and filter leaving it 1 quart low until the engine reaches operating temperature then top off as necessary.
2. The amount of time your bike has been sitting since the last time the engine was running.
3. The amount of gas and contaminants in the tank.
4. The oil pump location, exterior or interior.
5. The condition of your petcock gasket/seal/diaphragm.
If your gas tank was low and you start the engine probably nothing you would notice but if your gas tank was full and you start your engine the oil/gas mixture can blow into your air filter, come streaming out of your crankcase breather hose, and launch your oil tank cap followed by a blast of oil. The mess can be minor or you need to call a Hazmat team for assistance. This will also happen if you overfill your oil tank.
Next is the how and why gas can get into your oil tank/system:
a. The vacuum petcock rubber/diaphragm fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until contaminants from the gas tank build up in between the carburetor needle and seat breaking the seal thus inviting gas to enter the combustion chamber eventually finding it's way into the bottom end and the oil tank.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Oil smells like Gas
Fuel smell in oil
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

Jun 16, 2012 | 2004 Honda CBR 125 R

1 Answer

The engine seized up and you can smell gasoline in the oil


You have a ruptured fuel pressure regulator diaphragm.
The gasoline will leak past the piston rings and end up in the oil pan. You need to change the oil.

Nov 21, 2011 | 1994 Chevrolet Corvette

1 Answer

Gas in the oil


When a fuel injector is stuck open, the fuel will flood out. Gasoline will definitely get into the oil when this is the case.

If the fuel pressure in your car is too high (above 7 psi) that may cause gasoline to get into the engine oil.

Gas could also leak into your intake manifold if there is a carburetor problem.

An inoperative injector system can also cause this problem, because if the engine is not firing appropriately, the gasoline will end up running down the walls of the cylinders.

Check to see if the float in the gas tank is rising the way it should be rising or if it needs an adjustment. You will not be able to look at your gas gauge and get an accurate reading If the float is not functioning properly.

Your engine may be running rich, with too much gas going into the engine and too little air.

Check to see if the oil level might be really high. This can also cause trouble

Two ways to tell if you may have a problem with gas in your engine oil are:
1. If you start to smell a strong odor of gasoline while you are driving.
2. You notice white clouds of smoke coming out of your tailpipe.

If a large amount of gasoline does get into the engine oil, change the oil immediately upon fixing the problem that has allowed this to happen.

Jul 08, 2011 | Lexus ES 300 Cars & Trucks

1 Answer

I stopped for fuel yesterday and minutes after driving I could smell oil/gas? I stopped and put oil in sae5-30 and minutes later I could still smell oil??? Today I drove to work (20 miles) and didn't smell...


If you had to add oil, more then likely there an oil leak could be a gasket or oil seal, where ever the leak is at it's falling on the exhaust manifold and burning the oil, that's what you smell. Have it check cause low oil will damage you engine.

Jan 08, 2010 | 2004 Chevrolet Cavalier

1 Answer

91 Maxima Gasoline odor when I first start the car


If it is running fine, the busted bolt isn't the source of the gasoline smell. The intake manifold has vacuum, so the smell wouldn't be getting out, air would be going in, and a vacuum leak would give you poor idling. The exhaust manifold wouldn't have much raw gasoline smell. But it would have loud noise if the broken bolt were causing an exhaust leak.

Check that the vapor recovery line is not broken or disconnected. The hose connectors get cracked. If that were broken, it would cause a gasoline smell after the car has been sitting, especially if it has been sitting in the sun, heat driving gasoline vapor out of the tank. It is supposed to condense in the vapor canister, but some escapes if the line is broken. If it is broken, driving would **** out the gasoline from the line and the wind would dissipate the smell.

Or it could be a leaking injector. With the injector cover off, engine idling and cool, you can visually look for raw gas around the injectors and injector rail connections.

Hope this helps.

Oct 01, 2009 | 2004 Buick Century

2 Answers

My 91 acura integra is stalling after idling for just a few minutes. I just bought the car and it ran fine until just recently. I also noticed a gas smell after the car started again.


Idle is controlled by two main sensors: the FITV and the IACV. The FITV is a mechanical valve that is controlled by coolant temperature (there is no ECU plug to it). When the coolant is cold, the valve is open and letting air into the Intake Manifold through a hole in the Throttle Body above the throttle plate. This creates a small vacuum leak which in turn lets the motor idle higher than normal (supposed to be above 1K RPM for warming up). As the coolant warms up the valve closes and no longer lets air in through the hole in the throttle body. From this point the IACV, which is Engine Control Unit controlled, is letting small amounts of air into the Intake Manifold through another hole in the Throttle Body. Any amount of extra air the ECU is not expecting will confuse it and you will get either a high idle or a roaming/hunting/fluctuating idle. The principal of engine to operate is a need to have a Fuel : Air ratio of 14.6:1. You smell the gas after restart since the unburnt gas, when the engine dies, got pushed out through the exhaust manifold.
Th following are in order one after the other until it fix problem.
1- Find and replace the vacuum leak on hoses mentioned above.
2- Clean the the gunk built up at holes mentioned above.
3- Replace thermal valve at engine block identified by two vacuum hoses connecting to the Throttle Body.
Good luck.

Sep 28, 2009 | 1991 Acura Integra Hatchback

2 Answers

Acts like its running out of gas, raw gas smell


this suggests you have a fuel leak in the engine compartment. Possibly a leaking fuel manifold (injection rail), or the rubber line from the fuel tank is leaking where it attaches to the manifold. The fuel line to the cold start injector should also be checked. Rubber hoses on older cars become brittle and as they contract from very cold weather will leak. Turn the key to on for 1 minute but do not start the car. Then check under the hood for a raw fuel wet spot where the leak is.

Jan 10, 2009 | 2002 Subaru Outback

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