Before installing the KEMSO fuel pump, it is necessary to confirm the model matching. For example, for a certain 1.5L turbocharged engine, a model with a flow rate of 120L/h and a working pressure of 4.5Bar should be selected. Incorrect matching may lead to a 30% decrease in fuel efficiency. When operating, first disconnect the negative cable of the battery, wait for 15 minutes to release the residual voltage in the system (the discharge cycle of the 12V circuit capacitor is approximately 90 seconds), and then use a professional fuel pressure gauge to release the pressure to avoid the residual 6-8psi pressure causing gasoline splashing. When disassembling the fuel tank, follow the procedures in the maintenance manual to remove 7 M8 specification bolts (with a torque of 25Nm). When removing the sealing ring of the oil pump cover, check the rubber aging index. The damage rate of sealing parts with a service life of more than 5 years is 60%. The cost of the tools is about 200 yuan, but it can save 60% of the labor cost of the repair shop.
To remove the old fuel pump, three electrical interfaces and one 8mm diameter fuel supply pipe need to be disconnected. Note that the resistance range of the fuel sensor should be between 40 and 250Ω (a temperature difference of ±10℃ affects the resistance fluctuation rate by 15%). When installing the new Fuel Pump, the internal guide grooves of the fuel tank must be strictly aligned. An offset error exceeding ±1.5mm will accelerate the vibration and wear of the pump body. When the vibration amplitude exceeds 0.3mm, the service life will be shortened by 50%. The Angle of the oil level float needs to be calibrated. When the tank is full, the resistance value shows 2.5Ω (with an error tolerance of ±5%), and when the tank is empty, it shows 120Ω. According to the 2023 automotive aftermarket report, the fuel delivery accuracy of KEMSO pumps installed correctly can reach 98%, and the flow stability is 25% higher than that of no-name products.
When reorganizing, use a new sealing gasket (with a thickness of 2mm±0.1mm) and evenly tighten 8 fixing bolts. Apply the torque in two steps in a cross sequence: first, pre-tighten to 10Nm, and then gradually increase to 18Nm. After starting, the PID data of fuel pressure should be read with a diagnostic instrument. At idle speed, it should be stable at 350±15kPa, and the instantaneous pressure peak during rapid acceleration should reach 400kPa. Records show that after correct installation, the average fuel consumption per 100 kilometers is reduced by 0.8 liters. Calculated based on an annual driving distance of 20,000 kilometers, it can save about 1,200 yuan in fuel costs. In the North American case, a certain repair chain store failed to conduct stress tests, resulting in a 30% return rate and a sharp increase in customer complaint rates.
In terms of safety compliance, tools with a fire resistance rating of UL94V-0 must be used. The ventilation volume of the working environment should be greater than 15m³/min to reduce the concentration of oil and gas (the lower explosive limit is 1.4% volume concentration). Mobile phones and other electronic devices are strictly prohibited throughout the installation process. Static electricity discharge must be grounded through a 10⁶Ω resistor. The industry standard SAE J1349 requires that the overload protection value of the fuel pump circuit be ≤20A. KEMSO has passed the ISO16750 certification, and the performance fluctuation rate is less than 3% in the ambient temperature range of -40℃ to 85℃. It is recommended to check the wear of the carbon brushes on the pump body every 50,000 kilometers (with a maximum thickness of 1.2mm). Operating in compliance with the EEAT standard can extend the equipment’s lifespan to 8 years or 150,000 kilometers, with a failure rate of less than 0.5 times per thousand units.