| 摘要 |
A primary filter for the fuel supply circuit of a combustion device such as a motor vehicle engine which removes particulates and other contaminants from the fuel prior to being passed through a transfer pump. The primary filter of this invention replaces conventional primary filters having replaceable filter elements thereby reducing maintenance requirements. The primary filter includes a generally horizontally extending elongated cylindrical passage having an enlarged cross-sectional area compared to the inlet port, thus causing the fuel velocity to decrease and permitting heavy particulates and contaminants to settle out. Fuel is removed from the top of the primary filter which causes the fuel to undergo a change in direction which further enhances the contaminant separation effect. Contaminants are collected from the lower portion of the primary filter in a collection bowl or remotely located collection tank. Magnetic particles are removed from the fuel using a permanent magnet or electromagnet. A coarse particulate filter can also be provided with an automatic bypass feature to permit paraffin globules to be transmitted through the filter, thus preventing fuel starvation which can be caused by such deposits.
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