Abstract: Disclosed is a method of injecting natural gas into a diesel fuel engine for combustion with diesel fuel therein. One aspect includes injecting natural gas into an air-stream of an engine air intake or manifold, measuring the percentage of natural gas injected into the airstream or other efficiency gauge, varying the rate of injection of natural gas into the airstream in response to the measured percentage of natural gas therein and injecting the natural gas at a pre-determined rate so as to maintain an natural gas concentration in the air intake stream in the range of 0.6% to 3.0% by volume of natural gas.

Abstract: Disclosed is a method of injecting LPG gas into a diesel fuel engine for combustion with diesel fuel therein. One aspect includes injecting LPG gas into an air-stream of an engine air intake or manifold, measuring the percentage of LPG gas injected into the airstream or other efficiency gauge, varying the rate of injection of LPG gas into the airstream in response to the measured percentage of LPG gas therein and injecting the LPG gas at a pre-determined rate so as to maintain an LPG gas concentration in the air intake stream in the range of 0.2% to 0.6% by volume of LPG gas.

Abstract: Disclosed is a method of injecting LPG gas into a diesel fuel engine for combustion with diesel fuel therein. One aspect includes injecting LPG gas into an air-stream of an engine air intake or manifold, measuring the percentage of LPG gas injected into the airstream or other efficiency gauge, varying the rate of injection of LPG gas into the airstream in response to the measured percentage of LPG gas therein and injecting the LPG gas at a pre-determined rate so as to maintain an LPG gas concentration in the air intake stream in the range of 0.2% to 0.6% by volume of LPG gas.

Abstract: A modification to the “gas-topping” invention disclosed in WO 2008/064415 is disclosed in this specification. The modification involves measuring a sensor input such as that provided by a diesel engine diesel fuel rail pressure sensor (5) to thereby provide a signal indicative of fuel flow rate, modifying that signal by a signal modifier (3), and substituting the modified signal for the original unmodified signal in an engine electronic control unit (7). The result is that there is no increase in engine power relative to that produced without “gas-topping” so that substantially all the benefits of “gas-topping” are captured in decreased fuel consumption and not to provided in the form of increased engine power.

Abstract: Disclosed is a method of injecting LPG gas into a diesel fuel engine for combustion with diesel fuel therein. One aspect includes injecting LPG gas into an air-stream of an engine air intake or manifold, measuring the percentage of LPG gas injected into the airstream or other efficiency gauge, varying the rate of injection of LPG gas into the airstream in response to the measured percentage of LPG gas therein and injecting the LPG gas at a pre-determined rate so as to maintain an LPG gas concentration in the air intake stream in the range of 0.2% to 0.6% by volume of LPG gas.

Abstract: Disclosed is a method of injecting LPG gas into a diesel fuel engine for combustion with diesel fuel therein. One aspect includes injecting LPG gas into an air-stream of an engine air intake or manifold, measuring the percentage of LPG gas injected into the airstream or other efficiency gauge, varying the rate of injection of LPG gas into the airstream in response to the measured percentage of LPG gas therein and injecting the LPG gas at a pre-determined rate so as to maintain an LPG gas concentration in the air intake stream in the range of 0.2% to 0.6% by volume of LPG gas.