Booster pump arrangement for feeding a secondary circulation system in the operative system of a diesel engine

Claim 1

A fuel system for a diesel engine comprising: a primary fuel circulation system; an injection pump and a fuel pump for said primary fuel circulation system, said fuel pump consisting of a mechanical piston pump operatively associated with said injection pump and operating to pump fuel for said primary circulation system; a pump crankshaft and eccentric means in said injection pump for actuating said fuel pump; a piston chamber in said fuel pump having an end wall located away from said eccentric means; threaded means in said end wall adapted to receive therein a threaded plug in sealing engagement therewith; a secondary fuel circulation system including a booster pump for feeding said secondary system; a housing of said booster pump having provided thereon a threaded member adapted to be threadedly engaged with said threaded means in said end wall of said fuel pump for connecting said booster pump onto said fuel pump in operative association therewith; said booster pump being thereby adapted to be interchangeably attached with a threaded plug adapted to engage said threaded means in sealing engagement; said booster pump being constructed as a mechanical piston pump including a spring actuated piston which is adapted to be placed in operative connection with said piston of said fuel pump; and a plunger provided in said booster pump protruding from said housing thereof for placing said piston of said booster pump in operative association with said piston of said fuel pump when said booster pump is connected with said fuel pump.