Abstract: A regenerative rotary pump in an automotive fuel pump assembly. The rotary pump has a disc-shaped impeller in a circular cavity of a housing, vanes around the circumference of the impeller separated by pockets, a donut-shaped pumping chamber in the housing enveloping the vanes and the pockets on the impeller, a two-stage stripper between a discharge at a high pressure end of the pumping chamber and an inlet at a low pressure end of the pumping chamber, and a vent chamber between a high pressure stage and a low pressure stage of the two-stage stripper. The vent chamber is connected to the fuel tank removed from the inlet. High pressure gasoline carried by the pockets between the vanes flashes to vapor in the vent chamber to minimize the vapor jet stream effect at the inlet end of the pumping chamber.

Abstract: A method for combusting fuel containing bound nitrogen to achieve reduced NO.sub.x emissions wherein the oxidant and fuel are injected separately into a combustion zone through a burner and the oxidant is injected with a momentum equal to at least three times the fuel stream momentum and at an angle equal to or greater than the sum of the angles of the fuel stream periphery and oxidant stream periphery with their respective centerlines.

Abstract: A brake booster is dislosed wherein the risk of damage to the control valve housing of the booster in the area of the support of the guiding sleeve which guides the push rod is precluded. The guiding sleeve of the booster comprises an axial extension which, while accommodating the pressure plate and the reaction disc of the booster is located, in sealing manner, in the axial bore of the control valve housing of the booster.