Friday, October 11, 2013
How Electric Automotive Fuel Pumps Work
To run best, a vehicle needs fuel to be delivered to its engine on time and at the right pressure. The vehicles fuel pump is the mechanism that regulates these functions.
Function
When a vehicle is started, voltage is sent to the fuel pump and pressure quickly builds within the fuel system as the motor in the fuel pump begins to spin. Fuel is drawn into the fuel pump, and exits through a check valve. The fuel is then transferred to the engine via the fuel line.
Pressure
For an engine to work properly, the fuel has to be within the correct range of pressure. Not enough fuel pressure can be hazardous to the engine, while too much pressure can cause it to burn fuel rapidly and not run well. A pressure per square inch reading ranging between 30 and 85 is normal.
Powertrain Control Module
A powertrain control module (PCM) is the key feature that changes the way newer model vehicle pumps work. Older model pumps run at a set speed, while newer pumps have their speed controlled by the PCM. This helps supply an engine with the amount of fuel that it specifically requires.
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