摘要 |
An in-tank, fuel pump assembly for fuel-injected engines is provided which includes a reservoir (10) having a supply port (32) for supplying fuel to the engine and a return port (36) for receiving fuel returning from the engine. Within the reservoir (10) are 1) an electrically-operated, high pressure pump (26), 2) a jet pump (30) located at the bottom of the reservoir (10) for entraining fuel into the reservoir (10), 3) a valve (34) associated with the return port (36), and 4) a valve (38) associated with the supply port (32). The output of the high pressure pump (26) is routed to the jet pump (30) and to the two valves (34,38) whereby when the high pressure pump (26) is not operating, both valves (34,38) are closed, and when the high pressure pump (26) is operating, both valves (34,38) are open and the jet pump (30) entrains fuel into the reservoir (10). The jet pump (30) is sized to entrain more fuel into the reservoir (10) than leaves the reservoir (10) through the supply port (32) thus producing a net flow of fuel from the bottom to the top of the reservoir (10). As a result of this flow and the arrangement of the various components of the assembly, cool fuel from the main fuel tank is supplied to the engine rather than hot fuel returning from the engine through the return port (36), thus avoiding the hot fuel problems experienced in the prior art. |