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techtalk:evo:body02 [2020/07/01 18:52] ixl2relax [Petcock (Fuel Outlet)] |
techtalk:evo:body02 [2020/07/01 18:59] ixl2relax [Petcock (Fuel Outlet)] |
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| {{:techtalk:evo:body:petcock_function_1_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) \\ | {{:techtalk:evo:body:petcock_function_1_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) \\ | ||
| - | Starting in 1992, when there was an option for a 3.25gal Sportster tank, the petcock supplied was a new, vacuum-operated design. It had an automatic shutoff function that used a vacuum hose connected to the carburetor (tee'd off the hose to the VOES) to operate a diaphragm in the petcock. This diaphragm had a short plug that protruded into the fuel flow cavity, and held there by a spring, to prevent fuel flow until there was enough vacuum to pull the diaphragm/plug out of the cavity. | + | Starting in 1992, when there was an option for a 3.25gal Sportster tank, the petcock specified was a new, vacuum-operated design. It had an automatic shutoff function that used a vacuum hose connected to the carburetor (tee'd off the hose to the VOES) to operate a diaphragm in the petcock. This diaphragm had a short plug that protruded into the fuel flow cavity, and held there by a spring, to prevent fuel flow until there was enough vacuum to pull the diaphragm/plug out of the cavity. |
| - | This was considered a safety feature (to help riders who forgot to turn the petcock to the OFF position). It was the recommended petcock for all optional tanks from 1992-1994. This style petcock was implemented on all stock tanks (of any size) from 1995 thru 2006 (2007-later used electrical fuel pumps). A vacuum of approximately 0.5-1.0 in. of Mercury (Hg) must be applied to the vacuum diaphragm to open the petcock for fuel flow.((2006 Factory Service Manual)) The OFF setting is still recommended whenever the engine is not running (to prevent accidental fuel flow from a faulty vacuum diaphragm). | + | This was considered a safety feature to help riders who forgot to turn the petcock to the OFF position (and to help prevent fuel spills in case of an accident or tipover). It was the recommended petcock for all optional tanks from 1992-1994. This style petcock was implemented on all stock tanks (of any size) from 1995 thru 2006 (2007-later used electrical fuel pumps). A vacuum of approximately 0.5-1.0 in. of Mercury (Hg) was needed to open the petcock for fuel flow.((2006 Factory Service Manual)) The OFF setting was still recommended whenever the engine was not running (to prevent accidental fuel flow from a faulty vacuum diaphragm). |
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