约翰迪尔强鹿六缸柴油机低压燃油系统流程操作图迪尔90410541204拖拉机操作手册

约翰迪尔强鹿六缸柴油机低压燃油系统流程操作图迪尔904 1054 1204拖拉机操作手册

Low pressure Dual Rail Fuel Supply System Operation
a—Fuel transfer pumpE—Hand primer pumpI—Fuel ManifoldM—primary-Filtered Fuel
b—In-line Check ValvesF—primary Filter base OutletsJ—Fuel Supply RailN—Final-Filtered Fuel
C—primary FilterG—Water Separator bowlK—Fuel Return RailO—Recirculated Fuel
D—primary Filter baseH—Final FilterL—Suction Fuel from Tankp—Return-to-Tank Fuel

The fuel transfer pump (a) draws fuel from the fuelpassages to route fuel into and out of the cylinder tank through an in-line check valve (b) into the primaryhead. On some applications, the fuel manifold also filter base (D) contains a hand-primer pump (E) andcontains a fuel pressure sensing switch. The fuel three outlet passages (F). The water separator bowlpressure regulator will maintain fuel pressure at 410– (G), which screws to the bottom of the fuel filter base.480 kpa (4.1–4.8 bar) (60–70 psi).
a self venting drain valve is mounted on the bottom of
the clear bowl.Fuel flows from the fuel manifold into the fuel supply rail in the cylinder head. Fuel rails are drilled passages
Fuel flows from one of the primary filter base outlets toin the cylinder head that route fuel to each unit
the inlet of the fuel transfer pump mounted on the rearinjector. The fuel supply rail (J) is the bottom drilled
of the head. The fuel transfer pump is a gear typepassage;the return fuel rail (K) is the top drilled
pump. The pump shaft is coupled to the end of thepassage. The two passages are connected at the front camshaft. The fuel transfer pump contains a pressureof the head.
regulating valve for system over-pressure protection. a
bypass valve in the pump base allows fuel to bypassExcess fuel not needed by the electronic unit injectors the gears during hand priming.flows from the cylinder head into the fuel manifold. The
fuel flows past the fuel temperature sensor. at this Fuel flows from the outlet of the fuel transfer pump topoint the fuel is routed in one of two directions. The the inlet of the final fuel filter (H). The spin-on finalreturn to tank orifice will cause approximately 10% of filter is the last clean-up of the fuel before entering thethe fuel to flow back to the fuel tank. The return-to-tank engine.fuel enters the tank at the bottom to prevent fuel
drain-back. The remaining 90% of the fuel will flow Fuel flows from the outlet of the final filter to the fuelpast the pressure regulating valve and return to the manifold (I) mounted on the rear of the cylinder head.inlet of the fuel transfer pump to be recirculated The fuel manifold contains a fuel temperature sensor,through the cylinder head.
pressure regulating valve, return to tank orifice, and
RG,RG34710,1525 –19–30SEp97–2/2

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