| 摘要 |
In a fuel supply system, liquid fuel is supplied to a marine engine from a fuel tank ( 10 ). The fuel first passes through a water filter ( 14 ), a lift pump ( 18 ) and is temporarily deposited in a vapor separator ( 20 ) where vapors given off from the fuel are collected and vented. A high pressure pump ( 30 ) withdraws liquid fuel from the vapor separator ( 200 and delivers it under pressure to an engine injector system ( 36 ) via a fuel delivery line ( 34 ). The fuel pressure between the high pressure pump ( 30 ) and the engine injector system ( 36 ) is monitored to determine whether the engine injector system ( 36 ) is being presented with more fuel than is required for efficient engine operation. If more fuel than needed is being supplied by the high pressure pump ( 30 ), the unneeded fuel is returned to the vapor separator ( 20 ) through a bypass line ( 40 ). A pressure regulator ( 42 ) along the bypass line ( 40 ) prevents the return of fuel to the vapor separator ( 20 ) when the pressure differential between the vapor separator ( 20 ) and the fuel being delivered to the engine injector system ( 36 ) reaches a predetermined value. The bypass line ( 40 ) comprises a short path from the fuel delivery line ( 34 ) and returns fuel back into the vapor separator ( 20 ) without traversing large spaces. The water filter ( 14 ), lift pump ( 18 ), vapor separator ( 20 ), high pressure pump ( 30 ), by-pass line ( 40 ) and pressure regulator ( 42 ) are contained as an integral unit ( 46 ).
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