On the Troy Bilt bronco lawn tractor, gasoline fills the crankcase when its stored for a short period of time……….is it the carb?
Experienced gardeners share their insights in answering this question :
Yes it is. The float needle and seat are leaking and need to be replaced. I’m assuming it it a Briggs and Stratton engine. Just replacing the rubber tipped needle usually will not stop the leakage, the pressed-in brass seat also needs to be replaced and pressure tested. This would really need to be done by a shop. Not a hard job, just requires specialized tools to remove and install seat and pressure test……….

How to Identify and Fix Common Gardening Problems ?

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Bad for the environment, bad for engine performance

The gas leaks down into the crankcase, where it generates a fine mist of oil droplets from the oil used for lubricating and cooling the engine. In order to prevent the pressure in the crankcase constantly increasing, the crankcase gas needs to be vented off.

If your oil level is too high and you also notice a smell of petrol in the engine oil, there is a good chance that your gasoline engine has an oil dilution. Petrol settles on the cylinder walls during cold starts and is introduced into the oil via the piston ring. This results in a mixing of oil and fuel.
Diesel fuel dilution of the engine oil occurs due to internal leakage of the fuel injection system. Causes vary with different engines, but can be related to sealing ring failure, loose connections, faulty fuel injectors, or even the result of extended periods of idling.
Excess crankcase pressure may also occur if the PCV system vacuum supply becomes restricted. Excessive crankcase under-pressure, (vacuum) can occur if the fresh air inlet becomes restricted or the wrong PCV valve is used.
Common signs include oil leaks, excessively high idle, and a decrease in engine performance, power, and acceleration.
In short, when fuel mixes with the lubricant, it reduces the viscosity of the oil, meaning that the viscosity may be too low to create an oil film capable of withstanding heavy loads and speeds in some parts of the engine. This results in friction between the metal surfaces and wear of the parts.
If you don`t see it there, check the owner`s manual. How Do I Mix Oil and Gas? Never mix the oil and gas directly in the fuel tank. Always mix in a separate, leak-proof container that`s slightly larger than the volume of gas and oil required, and make sure the container is free of dirt or any other materials.
However, long-term exposure to benzene, the most toxic component of fuel oil, is known to cause leukemia. Prolonged or high level exposures to fuel oil can cause kidney and liver damage, nervous system damage, increased blood pressure and reduced blood clotting. Fuel oil leaves the body within 2-3 days.
Gas is less dense than both and will float to the top. Petroleum produced by source rocks will migrate into a “reservoir” rock.
Diesel is much lighter than water (specific gravity is 0.82-0.88, vs. 1.00 for fresh water and 1.03 for seawater). It is not possible for diesel to sink and accumulate on the bottom as free oil.
Mixing of the oil with petrol will cause the formation of gummy layer on the wall of cylinder because engine oil be burnt partially and as well as there will be emissions of poisonous gases which will pollute the environment. Gummy layer formation. Friction inside combustion chamber will be increased.
Diesel engine runaway occurs when a diesel engine ingests a hydrocarbon vapor, or flammable vapor, through the air intake system and uses it as an external fuel source. As the engine begins to run off these vapors, the governor will release less diesel fuel until, eventually, the vapors become its only fuel source.
A CPR or crankcase pressure regulator is nothing more than a pressure reducing valve. When installed on a compressor suction inlet and properly adjusted, the CPR will prevent the compressor suction pressure from ever rising above the CPR`s setting.
Some engines are even fitted with slowdown alarms so that when the oil mist alarm rings, the engine automatically slows down to prevent crankcase explosion. The Crankcase relief doors are also fitted to prevent any damage to the crankcase and ingress of fresh air inside the crankcase.
Crankcase pressure can be prevented by protecting the piston rings. With a cold start, no oil film is yet present on the moving parts. The chance of metal-to-metal contact increases, so that the piston rings wear faster. This can be prevented with the Lindemann Engine Performance Treatment.
Source of crankcase gases

These blow-by gases, if not ventilated, inevitably condense and combine with the oil vapor present in the crankcase, forming oil sludge or causing the oil to become diluted with unburned fuel.

If blowby gas is not properly handled, it can also foul surfaces, increase engine oil consumption and create a health hazard if an engine is operated in an enclosed space. Several factors have driven the development of systems for handling blowby gases from diesel engines.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Since day 1 I have has sand in my filter Have changed sand frequently How much sand goes into the filter I have S210T filter
ANSWER : Sand in your filter or sand in your pool? A common mistake when installing these is not to fill them half way with water prior to filling the tank with sand. Failure to do so often leads to cracks in the lateral assembly and sand in the pool. If that is the case you’ll need a new lateral assembly, part #SX210DA. Depending on how long ago it was installed and who installed it you may be able to get the part under warranty. If not it runs about $45.

The filter takes 200# of sand. Your product tag should confirm this with a statement of something like “media required: 200#” or something similar.


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I just put new fuel line on my trimmer now i cant start it not getting fuel the line never fills with fuel but i can **** fuel out so i know it not pinched it a weedeater brand ght-17
ANSWER : Make sure the little valve under the tank if you have one is fully turned clockwise. Make sure there is nothing clogging the tiny screen inside the fuel tank. Check or test your primer bulb it may be leaky. If carb or intake is leaking, you won’t get gas either. If you have a filter on this model, try changing it.

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Gasoline / oil leaking from crankcase – Troy-Bilt 4-Cycle Curve Shaft Gas String Trimmer #41ADT41C966
ANSWER : Hello p, the leak is coming from the rear crankcase cover which is located in front of carb, the screws may have loosened up or the pencil lead thin gasket has a crack, remove the air filter cover and carb,the four screws holding the cover on and you will see the gasket,not much of one but it is there,as far as i know i have never had a front seal leak,oh when the carb leaks it seems like the crankcase is leaking,so check it good,hope this helps,

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The primer ball will not fill with fuel. – Echo Zama Carb Kit For Shc210 For Rbk66b Rbk70 Carb
ANSWER : Sounds like you either have a hole in the fuel line or the primer bulb valve is leaking and drawing up air instead of drawing the fuel out the tank

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Twist and Edge Weedeater will not start.
ANSWER : You will have to check all the hoses and carb gaskets/diaphrgms. Get the model # off you carb and buy a repair kit from the fuel hoses. Be careful to put them back in the correct configuration.

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My ryobi will start but dies about 5 minutes later
ANSWER : Try running the machine with the gas cap loose. There could be pressure builiding up in the system due to the cap being too tight. There is no vent on these systems like an automobile. If the gas cap is overtightened this could be your problem as the cap is equipped with a gasket that allows the vapor to vent through the cap. Overtightening could be sealing off your vent

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I have recently purchased a new house, and with it, came a Yardworks riding lawnmower with a 15.5 hp engine, and a 42 inch cutting surface.

It ran briefly for a few minutes, but I ran out of gas

I cannot get the mower to start. Can you give me a step by step instruction on how getting it to go ?

I filled the tank with regular unleaded gas. Is this okay, or should I be filling it with a gas to oil ratio ?

Additionally, I checked the oil, and it was very low. When I filled the oil, I put too much. On the dipstick it says caution not to fill over the fill mark, which is what happened.

Can you give adice to get the mower going ?

Thanks !

ANSWER : Hi,As far as the gas goes…there probably is a fuel shutoff valve right under the gas tank that is shut off….find the valve and turn it on…If there is no valve then you may have water or bad gas in the carb… sometimes taking the air cleaner off and pouring a few drips of gas in the carb. will get it to run….A few other things…use Med. grade gas or even Prem. they are better for small engines…add a fuel additive like Stabil to you gas…the new Stabil for ethanol fuels is even better…ethanol is bad for small engines…Oil over full will not keep the motor from starting, but it will smoke, if too full…find the oil drain plug at the bottom of the motor and drain a bit out….If all else fails go to Home Depot of find a product called “Mechanic in a bottle” then follow the instructions on the bottle…heatman101

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Gasoline in the crankcase
ANSWER : If, inside of the carburator the needle and seat does not close (dirt in carb) the fuel will slowly keep pushing through the carb,through the intake into the cylinder then into the crank case.
Do not run this engine until the carb. is rebuilt. The float in the carb.also needs checked to be sure it still floats and its at the exact factory setting.
Also have a new inline fuel filter installed.
Check for dirt in fuel tank.
Keep the air filter clean and in good condition.
I hope this helps you.

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