Makes no difference! Just ensure it is back in the on position not the reserve position after it is filled Remember on some bikes its not an off position either. Most new bikes use a vacuum system to turn on and off the fuel and the off is actually the on. Or always on , vacuum on and vacuum reserve on.
== If you have a gravity-fed fuel system, you should turn it off whenever the engine is not in use or gasoline will invade your oil and cause problems.
The petcock should have an arrow on it. Up is reserve,down is on and 3 oclock is off.
I think you may find that the letters ar Pri - Prime - the position of the petcock that will allow fuel to flow freely all the time. Should only be used when the carbs are empty of fuel (eg when carbs have been drained or bike not run for some time. Leaving the petcock in this position may lead to hydraulic lock in the cylinders if your carb float valves do not seal perfectly. So only use it in this position to refill carbs if they were thought to be empty.
The petcock should be along the bottom edge of the radiator facing the engine. It is probably close to the bottom hose connector.
I'm assuming by petcock you mean the drain on the radiator. If it has one (which it should), It's on the bottom, rear, drivers corner of the radiator.
No, should not matter unless you have a bad carb that is pron to leaking. There would be a very small increace in presure to carbs with a full tank and set on reserve, but probley not enought to make a diff. Tell me what happened? if any thing? Ben Parker, San Jose, Ca.
The first thing to do is drain all fuel from the gas tank. Begin with turning the valve of the petcock to OFF. Then the fuel hose from the petcock to the carburetor is loosened at it lower end and the fuel drained from the tank itno a sutable vessel. Next, remove vacuum hose from the nipple on the back of the petcock. Turn the valve to "Reserve". Drain the reserve gas out from the tank by using a vacuum pump connected to the nipple. When no fuel is left remove the vaccum line and the pump. The next step is to remove the petcock from the tank. This is easily done by loosening and then removing the nut that fastens it to the underside of the gas tank. When you remove the petcock you will see a long screen in the form of a cylinder come out of the gas tank. Clean or replace the screen filter. Reassemly is the reverse of dissassembly except you don't need to use the vacuum pump again. Note that the threads of the petcock should be coated with a suitable sealant that can withstand gasoline. Also replace the gasket under the nut holding the petcock in place. Insert the assembled parts into the gas tank and then tighten the petcock nut well in place. The hoses are finally attached. Now you can fill gasoline in the tank but check carefully for leaks. It's no joke getting a gasoline leak right onto the hot engine.
it should be on the raditor next to the lower hose
well some older jet skis do not have fuel gauges so in that case put the reserve on when it stops going. when the fuel gauge is very close to low it would be good to put the reserve on and get home quickly.
Should be at the lower left corner of the radiator.
Looking at the car from the front, the petcock is on the lover right hand side of the radiator. It doesn't twist, rather pulls out. Pull it toward the engine and it should open.
Probably a bad fuel petcock on the bottom of the tank. It is vacuum operated so it will not flow fuel unless the engine is running. (Safety feature) My older '79 GS has a "prime" setting on the petcock that allows the fuel to bypass the vacuum shutoff and run straight into the carbs (thus filling the floatbowls should the engine not be able to start due to lack of fuel in the carbs.) Either you have a bad petcock or you are checking it in the "ON" position. If you have "prime" it should flow fuel without a problem. If not there may be dirt in the petcock or other internal problems. Hope this helps. Mark in NE Indiana. _____ I just fixed my 1983 GS750E which had a fuel flow issue with the petcock. After disassembly of the petcock it was found that the fuel valve o-ring would tack itself to the sealing surface, thus, not allowing fuel to flow. See this forum posting for a how to fix: http://www.thegsresources.com/_forum/showthread.php?t=141244
LOL most likely on the radiator,near the bottom i would imagine If you are facing the vehicle, the petcock is located on the left side bottom of the radiator. It is not easy as it should be to get the petcock to turn. I had to get to it from the passenger side fender. There are sharp metal pieces above the assembly so be careful not to scrape your arm.