Importance

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Abstract

A fuel injection system for an internal combustion engine, such as a dual fuel diesel/gas engine of the type requiring an overall system turn-down ratio capability, from maximum fuel flow rate to minimum flow rate, on the order of 100 to 1, employs a conventional variable displacement primary pump having a turn-down ratio substantially less than the overall system ratio. The output of the primary pump branches to supply two parallel fuel conduit paths. Each path includes a pressure actuated shut-off valve means. The primary shut off valve means path opens to permit flow through the path to the engine at pressures in excess of a relatively high value. The secondary valve means opens to permit flow through the secondary path in response to a relatively lower pressure at the pump outlet. And, a fixed quantity fluid dispenser in the secondary flow path operates in response to opening of the secondary valve means, to displace a fixed quantity of fuel through the secondary path and into the engine.

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First Claim