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Publication Date: 2014-Nov-03
Document File: 1 page(s) / 235K

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The Prior Art Database

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When a fuel tank is "green" (not exposed to fuel hydrocarbons), fueling it can be tricky. During initial fueling of the green fuel tanks, the fuel is typically dispensed into the fuel tank as a spray pattern. The sprayed fuel instantaneously evaporates and mixes with the air in the fuel tank, such that the entire fuel tank is filled with an air/fuel mixture.As hydrocarbons enter the fuel tank, the tank has only air and the partial pressure is disturbed initially. Over time, partial pressures will reach equilibrium.This creates pressure spikes as high as 60 InH2O and can result in fuel spitback. This phenomenon typically occurs in an auto assembly plant when fuel tanks are first filled. As a result, a "variable" dispense rate (5 GPM for 15 seconds followed by 12 GPM) is required on some vehicles to eliminate fuel spit back while fueling on the assembly line.The low-high dispense profile, while mitigating fuel spitback, degrades fueling cycle time on the assembly line. This is problematic for large fuel tanks that require a long time to fill.The "green tank" effect can also be encountered when a used tank is drained all the way down and soaked. Refueling it becomes difficult as many shutoffs may be encountered at the dispensing pump.


This method mitigates the green tank effect by evacuating the fuel tank prior to refueling. HEVs have a special vacuum pump (ELCM) that is used to perform Evap leak detection. For non HEVs,...