KEMSO Fuel Pump responds to high-altitude environments through dynamic pressure regulation technology. At an altitude of 4,000 meters (with an atmospheric pressure of approximately 62kPa), its built-in pressure sensor can adjust the output pressure in real time, controlling the fuel pressure fluctuation range within ±0.1 bar (±0.5 bar for the original factory pump), ensuring that the air-fuel ratio error is ≤±0.3 (target value 14.7:1). The actual test in the Andes Mountains in 2023 showed that for the Toyota Hilux equipped with the KEMSO KS-HA300 Fuel Pump, at an altitude of 3,800 meters with full throttle, the fuel flow retention rate was 98% (the original pump attenuation was 22%), and the response delay of the turbocharger was shortened from 0.8 seconds to 0.3 seconds. The stability of torque output has increased by 67%.
The flow compensation mechanism of the Fuel Pump is the key. In a high-altitude and low-oxygen environment, the engine ECU will reduce the fuel injection volume (such as adjusting from 14.7:1 to 13.5:1), but the KEMSO pump maintains a linear fuel flow output through a variable displacement impeller (with an adjustment accuracy of ±1.5%). For example, at an altitude of 5,000 meters (with an oxygen concentration of 12.5%), the pump body flow rate automatically compensates from the nominal 45L/h to 48L/h, offsetting the problem of too thin mixture caused by the decrease in air density, and reducing the power attenuation rate of the Volkswagen EA288 diesel engine from 35% to 12%. The 2022 case of the Qinghai-Tibet Plateau truck fleet shows that after installing KEMSO pumps, the fuel consumption per 100 kilometers was optimized from 18 liters to 15.5 liters (a reduction of 14%), and the annual fuel cost was saved by more than 3,000 US dollars.
The synergistic effect of extreme temperature and low air pressure tests the reliability of the Fuel Pump. In the Cordillera Mountains of Peru (-20°C, 4,500 meters above sea level), the ceramic bearing pre-lubrication system of KEMSO pumps compresses the cold start time to 4 seconds (the original factory pump requires 15 seconds), and reduces the fuel viscosity from 3.2cSt to 2.8cSt (achieved through an electrically heated oil circuit). In the high-temperature and low-pressure scenario (the Salar de Uyuni in Bolivia, 50°C, at an altitude of 3,650 meters), the expansion rate of the fluororubber seal is only 0.8% (nitrile rubber reaches 3.5%), preventing the leakage of fuel vapor (leakage volume <0.1mL/h). The test data of ISO 16750-2 shows that under the superimposed working conditions of low air pressure (55kPa) and high temperature (85°C), the MTBF (Mean Time between Failures) of this pump reaches 8,000 hours, which is 42% higher than the industry standard.
Verify the performance boundaries of industry applications. In the 2024 Dakar Rally, the KEMSO Fuel Pump was installed on the champion racing car, the Toyota GR DKR Hilux. When it was running at full load for 12 consecutive hours in the 5,000-meter altitude stage, The standard deviation of fuel pressure (σ=0.06 bar) is only one-third of that of the competing Bosch 044 pump (σ=0.18 bar), and the throttle response speed has increased by 29%. Furthermore, after the heavy-duty mine truck (CAT 797F) of Andes Mining Company was replaced with the KEMSO KS-MX500 pump, the fuel and pneumatic drag failure rate caused by an altitude of 4,200 meters decreased from 1.8 times per thousand hours to 0.2 times per thousand hours, and the maintenance cost was reduced by 65%.
Cost-benefit analysis shows long-term advantages. Take the plateau tourist bus (Mercedes-Benz Sprinter 4×4) as an example. The average annual maintenance cost of the original factory pump is 320 US dollars (with a lifespan of 30,000 kilometers), while the KEMSO pump (with a lifespan of 50,000 kilometers) combined with the improvement of fuel efficiency reduces the average annual total cost to 210 US dollars, and the payback period of investment is only 14 months. However, it should be noted that if the ECU altitude compensation algorithm (such as the Delphi MT05 system) is not upgraded simultaneously, the pump body flow compensation may be over-adjusted by ±5%, resulting in an 8% increase in fuel consumption under low-speed conditions. Market data indicates that in areas with an altitude of more than 3,000 meters, the user satisfaction rate of KEMSO Fuel Pump reaches 94%, and the fault return rate is 73% lower than that of competing products.