| 摘要 |
A head (10) for mounting a replaceable spin-on fuel filter element (12) for use in a vehicle fuel system, includes an inlet (18) and outlet (76). The inlet is connected in the head to a second chamber (24) through a first check valve (26). The first check valve enables flow only from the first chamber to the second chamber. The second chamber includes a manually actuated pump (28). The second chamber is connected to a fluid in-flow area (64) of the element through a second check valve (62). The second check valve enables flow only from the second chamber to the in-flow area. The first chamber is also connected to the in-flow area of the element through a third check valve (84). The third check valve enables flow only from the first chamber to the in-flow area of the element. To remove air from a newly installed element and to prime the fuel system of the vehicle, the manual pump is cycled. The pump moves fuel from the inlet of the head through the first check valve, second chamber and second check valve, pushing fuel and air through the element to the outlet. When the manual pump is used, the third check valve remains closed. When the engine of the vehicle is started, vacuum is drawn on the outlet of the head. Fuel then flows directly to the in-flow area of the element from the first chamber in the head through the third check valve, bypassing the pumping means.
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