FUEL SUPPLY DEVICE FOR LIQUEFIED-PETROLEUM-GAS ENGINE

PURPOSE:To make a stable fuel feed attainable all the time, by installing a primary chamber, which decompresses LPG fuel, and a vaporizer having a secondary chamber, which is connected to the former via an interconnecting passage and further decompresses the said fuel, while varying internal pressure in the primary chamber according to a degree of engine load. CONSTITUTION:A vaporizer 4, where a fuel delivery part is connected to a fuel feed port 3 opened to a Venturi part 2a of an LPG engine's mixer 2, is provided with a casing 6 whose inside is partitioned into two parts, namely, a primary chamber 9 and a secondary chamber 10 by a partition wall 8 having a warm water passage 7. The primary chamber 9 is connected to an LPG cylinder via a port 12 to be opened or closed by a primary valve 13. In this case, this primary valve 13 is controlled by a primary pressure regulating device 19, which controls a spring 20 for its pressing force against a diaphragm 17 and regulates internal pressure in the primary chamber 9, via a lever 15. And, this regulating device 19 is constituted to be controlled by dint of excitation of a solenoid 52 so as to cause the internal pressure of the primary chamber 9 in time of engine low load to be lowered down to some extent as compared with that in time of high load.