Integrated fuel supply system for an internal combustion engine including filter, valve, and pump

Claim 1

An integrated fuel supply system for an internal combustion engine, comprising: (a) a fuel inlet passage (16), (b) a first chamber communicating with said fuel inlet passage (19), (c) a fuel filter (18) disposed between the inlet passage and the first chamber, (d) a second chamber (23,36), (e) a normally closed biased valve (21) disposed between the first and second chambers, (f) a valve diaphragm (22) operably engaged with the valve, (g) a pressure chamber (20,29') disposed on one side of the valve diaphragm for accumulating a pressure which produces a force in the opposite direction of the spring bias of the valve thereby tending to open the value, (h) passage means (B) for communicating with a source of pulsating pressure, (i) a non-return valve (30, 30') disposed between the passage means and the pressure chamber, (j) a fuel pump chamber (38), (k) a fuel outlet passage (41), (l) valve means (37,39) individually disposed between the second chamber and the fuel pump chamber and between the fuel pump chamber and the fuel outlet passage, (m) a pump diaphragm (43) operatively communicating on one side thereof with the pump chamber, (n) passage means (A) for communicating the source of pulsating pressure to the other side of the pump diaphragm, and (o) a unitary housing assembly mounting and defining therein all of the above-recited structure.