What is a petcock used for?
Petcocks are used to periodically drain water from diesel fuel water separators on some trucks. The large MAN six-cylinder diesel engines used on German U-boats had petcocks that enabled the engineers to verify combustion in each cylinder.
How does a fuel petcock work on a car?
A petcock can serve as a bit of a theft deterrent, but shouldn’t be relied on for that purpose. When in the ON position, fuel is freely drawn from the tank to the carburetor. This allows the engine to operate. If you find the engine is hard to start, check that the fuel is turned on.
What is the difference between a petcock and a valve?
Historically, petcocks were threaded valves controlled by a butterfly handle; modern petcocks are typically ball valves . Compared to the progressive control of a gate valve a ball valve style petcock's is coarse, confining their use principally to on-off applications.
Where is the petcock on a motorcycle?
This valve is characteristically located at the bottom of the fuel tank and can have a number of different configurations. Fuel-Injected motorcycles rarely have a petcock.
How does a petcock valve work?
0:136:28Petcock Tutorial - YouTubeYouTubeStart of suggested clipEnd of suggested clipYes you heard right it's called the petcock the petcock is a valve that turns on and off your mopedsMoreYes you heard right it's called the petcock the petcock is a valve that turns on and off your mopeds gasoline flow specifically it turns on and off the gas flow between the tank and the carburetor.
What position should my petcock be in?
0:222:32Basic Petcock Operation (for mikemikemotorcycle) - YouTubeYouTubeStart of suggested clipEnd of suggested clipBut anyway here is how the petcock works in the front there is the reserve down below it's in the onMoreBut anyway here is how the petcock works in the front there is the reserve down below it's in the on position. And then back there is in the off position.
How does a diaphragm petcock work?
0:052:37How-To: Test Petcock Diaphragm - YouTubeYouTubeStart of suggested clipEnd of suggested clipWhen the bike dies out it cuts off fuel flow. So you know fuel won't spill all over the road. AnywayMoreWhen the bike dies out it cuts off fuel flow. So you know fuel won't spill all over the road. Anyway I have to hook tup from where the inlet is here where it hooks up to the intake manifold.
Should you turn the petcock off?
The primary reason for shutting off the fuel is safety. On a motorcycle the fuel tank is directly above the engine. If fuel were to leak it would drip directly on the hot engine.
Should the fuel valve be on or off?
Not only does shutting off the fuel valve prevent the engine from flooding while being transported, it prevents flooding because of contamination in the float valve, and extends the life of the float valve by decreasing pressure on it.
How do I turn off the fuel on my petcock?
1:052:09Motorcycle fuel valve (petcock), how it works - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou have to turn the valve to and off now wait no longer allows gasoline to flow or fuel to flow.MoreYou have to turn the valve to and off now wait no longer allows gasoline to flow or fuel to flow.
How do you test a petcock valve?
9:3513:00How to test a vacuum operated fuel valve - YouTubeYouTubeStart of suggested clipEnd of suggested clipUnplugging your main fuel line and hooking. Some kind of hose up to it to go into a bucket. And whatMoreUnplugging your main fuel line and hooking. Some kind of hose up to it to go into a bucket. And what you should do is when you apply vacuum to this clamp.
What is a petcock vacuum?
A petcock, or sometimes referred to as a fuel tap or fuel valve, is a 2 or 3 way valve on the bottom of your fuel tank. It works by directing fuel from your tank to the carburetors or fuel injectors. Fuel is pulled by either gravity or vacuum from the fuel system.
Why is it called a petcock?
petcock (n.) also pet-cock, "a small plug-cock, made to be fastened to a pipe and used for draining water and condensation from steam cylinders, etc.," 1864, from cock (n. 2); the signification of the first element is uncertain.
What happens if you leave the choke on overnight?
What Happens If You Leave The Choke On Overnight? Nothing will happen if you leave the choke on overnight. Since the engine is off, the carburetor isn't in operation and nothing is moving internally in the engine no harm will come.
Why do motorcycles have petcock?
The purpose of a motorcycle petcock is to allow the rider to control the fuel flow to the engine. The petcock has three positions: ON, OFF, and RESERVE. The ON position allows fuel to flow from the gas tank to the engine.
When should I reserve my bike?
Use the reserve fuel only when the main supply is exhausted. Refill the tank as soon as possible after switching to "RES" position.
Where is the Petcock Valve Situated?
You can find it underneath the radiator of your vehicle if you lift the front of your car with a jack. The petcock is a little bolt right under the radiator and simple to spot as modern radiators do not have any additional holes underneath them that would need bolts.
What is the Purpose of a Petcock?
A petcock is a tiny shut-off valve used to manage the flow of liquid or gas. In the past, petcocks were threaded valves restricted by a butterfly handle; modern petcocks are characteristically ball valves.
Which Way is on for a Petcock?
You are in the “ON” pointer. Oppose clockwise is “OFF”. Clockwise is “RESERVE”. Check it by turning to the off situation and pulling off the gas line.
How to Fix a Clogged Petcock?
If there are two small screws holding a metal cover on the front of the petcock, untie them before unscrewing the petcock from the gas reservoir. Pull the selector handle off. By using something pointy, calm pry the four holed rubber eyelet out of the petcock. Clean the petcock out with dirt-free gasoline.
Vacuum Petcock
Stock vacuum petcocks obtainable on dual activity models are known to humiliate and fail after several years. Vacuum petcocks have three-pointers: ON, RES, and PRI. The positions are explained below:
Vacuum Caps
One last option is to replace an out-of-order stock petcock with a vacuum-style petcock that has a true “off” position as an alternative of prime. Several Kawasaki motorcycles own this kind of petcock, containing the Ninja 500 and the KLR650, which accumulate in the stock DR350 container.
Reserve on a Few Motorcycles Bypasses the Vacuum Valve
When you are utilizing the ‘reserve’ position on many older motorcycles you are bypassing the vacuum functioned ‘ON’ situation of the petcock. The vacuum-operated control device is a safety function and facility so that fuel will only flow into the carburetor while the engine is hot, working creating a vacuum.
Why do trucks use petcocks?
Once the engine started they were closed and the engine would begin running smoothly. Petcocks are used to periodically drain water from diesel fuel water separators on some trucks.
What is a petcock valve?
A petcock is a small shut-off valve used to control the flow of liquid or gas. Historically, petcocks were threaded valves controlled by a butterfly handle; modern petcocks are typically ball valves . Compared to the progressive control of a gate valve a ball valve style petcock's is coarse, confining their use principally to on-off applications.
What are some examples of gravity feed systems?
With universal adoption of fuel pumps they have all but disappeared in that application. Some historic examples of gravity feed systems include the Porsche 356 and early Volkswagens, which have a petcock with off, on, and reserve positions, much like a motorcycle petcock.
Where is the drain petcock?
You can locate it underneath the radiator of your car if you lift the front of your car with a jack. The petcock is a small bolt right under the radiator and easy to spot as modern radiators do not have any other holes underneath them that would require bolts. Usually, the underside of a car radiator is covered by a plastic panel which can be easily removed to reveal the radiator drain petcock. Unscrewing the petcock then is a really easy job and requires simple mechanic tools.
What is a radiator drain petcock?
The major function of the radiator drain petcock is not only to stop coolant from leaking through the hole underneath the radiator, but it serves a reverse role too. The petcock has been placed in modern cars to make draining a radiator an easy task. Like mentioned earlier, the same task was a pain to perform in older cars as taking out the radiator completely was a complicated process and usually required more than one mechanic to avoid tipping the radiator which could fall and get damaged. The radiator drain petcock ensures that by just unscrewing it, all the fluid from the radiator can be collected easily by keeping a bucket underneath the car without having to move the radiator an inch.
