USB Autoscope

Analytics and diagnosctic equipment for automotive industry

Fuel pump

Applications:

  • main fuel pump for fuel injected engines;
  • low pressure or lift pump for direct injection engines;
  • lift pump for diesel engines.

fuel_pump_1

fuel_pump_2

Voltage and current waveforms of a properly functioning fuel pump. Engine start and running at idle.
1 – supply voltage;
2 – current of the fuel pump.

fuel_pump_3

fuel_pump_4

Voltage and current waveforms of a malfunctioning fuel pump. Engine start and running at idle.
1 – supply voltage;
2 – current of the fuel pump.

fuel_pump_5

fuel_pump_6

fuel_pump_7

Examples of current waveforms of malfunctioning fuel pumps with poor contact between brushes and commutator. Engine is running at idle.

fuel_pump_8

fuel_pump_9

Voltage and current waveforms of a malfunctioning fuel pump, the armature is seizing. The current going in to the pump increases and results in overload, burned relays and connectors as well as fuses blowing.
1 – supply voltage;
2 – current of the fuel pump.
A – engine start;
B – point in time where the fuse blew.

The USB Oscilloscope program is required for waveform playback. Get the latest USB Oscilloscope program here.