The main flow dependencies of the pumps in low-pressure fuel systems in tanks of complex configuration

Vehicles with rear and four-wheel drive are equipped with fuel tanks of complex configuration, in which refueling tank volume is divided into two forecastles, due to the layout requirements for transmission parts to drive the rear wheels. To ensure the continuous operation of the low-pressure fuel system and the efficient use of the fuel tank volume, a flow transfer system from one forecastle to another is required. The most common device used in low pressure fuel systems is a jet pump. The article describes the regular and irregular circuits of the low pressure fuel circuit. The classification of intake and overflow ejectors has been presented depending on the pressure level of the active flow. The operating conditions of the fuel module and ejectors in the low pressure loop were determined. A formula was obtained that determined the dependence of the excess supply minimum coefficient of a fuel pump on the ejection factors of the intake and overflow jet pumps. It was shown that the passive flow in the studied models of jet pumps did not depend on the ejection factor and was determined only by the pressure in the active flow. The minimum pressure levels at the inlet to intake and overflow ejectors for the functioning of the low fuel pressure system depending on the nominal engine power were determined as well.

dual fuel tank, return system, non-return system, intake jet pump, overflow jet pump, fuel module, ejection factor, active flow, passive flow

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