Injector Fuel Pump 3917002RX Diesel Injector Pump Fuel Injector Pump

1. The fuel level display is inaccurate

Today's fuel pumps basically integrate the fuel pump motor, gasoline filter and oil level sensor. The working principle of the oil level sensor is to change the height of the oil float in the fuel tank to the change in the resistance of the resistor. , and then converted into current and transmitted to the instrument panel for display.

The main reason for the inaccurate oil level is abnormality in the internal resistance piece. For example, the oil film contaminates the contact resistance, causing the resistance to increase or directly falls off and breaks the circuit, or the fixed spring piece is loose and has poor contact.

2. Engine cannot start and accelerates poorly

If it cannot start, it is caused by damage to the fuel pump. Most of the time it is caused by insufficient pressure. The main reason is that the upper and lower shells fall off. When the heated temperatures are different, the welding points on the shells are not strong, leading to cracks and fuel leakage. , causing difficulties in fuel supply. If the gasoline filter is clogged and the motor speed decreases, the fuel supply pressure will drop. Using more corrosive fuel (such as gasoline containing more methanol) will cause the chemical adhesive attached to the filter to clog the filter.

3. Fuel pump makes abnormal noise and does not work

Abnormal noise and failure of the fuel pump are mainly caused by abnormal wear of the carbon brush commutator of the motor, which will cause the rotor to get stuck, a significant decrease in speed, abnormal noise in the armature rotor operation, etc. The most serious cause is the engine stalling. If this is the reason, we can use the method of tapping the fuel pump to temporarily make the fuel pump run, and then slowly drive it to the repair shop for repair. The solution to this problem is to avoid using inferior fuel and replace the carbon brush commutator with good quality and reliable workmanship.