Fuel pump
Applications:
- main fuel pump for fuel injected engines;
- low pressure or lift pump for direct injection engines;
- lift pump for diesel engines.
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.
Voltage and current waveforms of a malfunctioning fuel pump. Engine start and running at idle.
1 – supply voltage;
2 – current of the fuel pump.
Examples of current waveforms of malfunctioning fuel pumps with poor contact between brushes and commutator. Engine is running at idle.
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.