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The petcocks are vacuum operated petcocks. This means that they have a little diaphragm and valve set-up in them which responds to engine vacuum and allows fuel to flow only when the engine is running and supplying vacuum. This is is how things work when the petcock lever is set to the "on" or "run" setting. So we see that the "on" setting is actually the "off" setting when the engine is not running. So if the engine quits for any reason (as in a "down" situation), the petcock(s) will automatically close and prevent the fuel from flowing out.
These petcocks also have two other lever settings:
The "prime" setting bypasses the vacuum function and allows fuel to flow at all times, even when the engine is stopped. The purpose of this setting is to allow the carb float bowls to be filled when the engine is not running. Note that if you run your petcock(s) on the prime setting all the time, you lose the safety feature provided by the vacuum petcock. Note also that on this setting, fuel is prevented from flowing out through the carbs, into cylinders, etc.) only by the float valves in the carbs, which close when the carbs are full. Should one of these float valves stick open or leak, you then get flooding through that carb.
The "reserve" setting is used to access an additional amount of fuel when you start to run out. Here is how this works. These petcocks have inlet towers which stick up into the tank. In the "on" position, fuel flows down to the petcock through an opening high on the tower. So when you "run out of fuel" you actually have some more fuel sitting in the bottom of the tank which lies below this high inlet. When you turn the petcock lever to "reserve", a lower inlet near the bottom of the tower opens, so you can gain access to this last bit of fuel in your tank.
What else can I help you with?
How much rear end oil does a 2005 suzuki vinson 4x4 ATV take and what kind is the best to use?
best thing to do is visit or call your local suzuki dealer for proper oil & compacitys, takes out all the guess work......hope this helps.......
How does the fuel petcock work on a 95 Suzuki 750 GSX Katana?
On - Regular DrivingReserve - Is when you run out of gas, gives enough gas when on this setting to make it to the gas stationPrime - Dont use this if possible, it opens the fuel valve all the way.
1985 kawasaki ltd 454 will not start?
It is a fair bet that your vacuum line to your petcock is off. The petcock on the 454 has a diaphragm pump in it to pump fuel and those are known to go bad. Also, if you do not have both air filters installed it will refuse to start. If neither of those work, IM me and I'll dig up the link to a site that specializes in them. "Great White Knight EN450" may turn it up if you do a web search. TargetDriver
How would you test if mechanical waves did or did not work in a vacuum?
To test if mechanical waves work in a vacuum, you would need to conduct an experiment where you create mechanical waves in a controlled environment that is a vacuum. If the waves can still propagate and be detected in the vacuum, then it shows that mechanical waves can work in a vacuum. If the waves cannot propagate or be detected in the vacuum, then it indicates that mechanical waves do not work in a vacuum.
How does the vacuum switching valve work?
how does the 83 tercel thermostatic vacuum switching valve work
How does the automatic decompression work on your 2000 Suzuki 500 Vinson Quad ATV?
The automatic decompression system on the 2000 Suzuki 500 Vinson Quad ATV helps facilitate easier starting by relieving pressure in the engine's combustion chamber during the initial kick of the starter. This is typically achieved through a mechanism that momentarily opens the exhaust valves at the beginning of the compression stroke, allowing air to escape. Once the engine reaches a certain RPM, the decompression mechanism disengages, allowing normal compression to occur for efficient engine operation. This feature reduces the effort required to start the engine, especially in cold conditions.
Can a vacuum cleaner work in a vacuum?
a vacuum cleaner uses air to create suction. in a vacuum there is no air. Therefore, the aswer is NO.
How do vacuum cleaners work?
Basically just a fan that creates a vacuum
Will a parachute work in a vacuum?
no it will not
Does a bagless vacuum work as well as a typical vacuum?
Yes but you have to keep the filter clear or it won't work at all.
How does a pool vacuum cleaner work?
how does vaccum work
Ould someone tell me i have a 1987 suzuki samurai about mid throttle its boggs and won't go it sat for a year before i got it?
You need to get the carb vent tube and install it. Just do a web search for samurai carb vent tube fix. It's right from Suzuki. Also take off the distributor cap and use a vacuum tester (squeeze kind) on the vacuum line going to the distributor. Look inside the bottom of the distributor as you work the tester and make sure the vacuum advance is moving and hasn't gotten stuck from sitting. While your at it this is a good time to remove the EGR and clean the intake tube behind it. After you restart use small (very) squirts of starting fluid around the vacuum lines. Listen for the motor to speed up temporarily. Fix all leaking vacuum lines! Very important for that carb to work well.
