What controls the pressure of an electric fuel pump system ? Is there an internal pressure switch to stop the pump when pressure is reached?
2007-03-26 09:46:16 · 4 answers · asked by Ron 2 in Cars & Transportation ➔ Maintenance & Repairs
On most modern vehicles, the fuel pump is "commanded" by the vehicle's PCM (powertrain control module) to run continuously while the engine is running, by supplying a ground to the fuel pump relay to complete the circuit. The way fuel pressure is regulated varies depending upon the setup of the fuel system. There are return type fuel systems, which comprise of a fuel supply and return lines. The pressure is controlled by a fuel pressure regulator mounted on the fuel rail, to open when there is excess pressure, and close when more pressure is needed. On a more modern returnless type fuel system, the PCM controls the amount of current supplied to the fuel pump in order to control the fuel pressure, during operation. Hope this helps.
2007-03-26 09:55:14 · answer #1 · answered by Anonymous · 1⤊ 0⤋
They run continueously.
Pressure is regulated with something called the fuel pressure regulator, typically found at the end of the fuel rail(s)
2007-03-26 16:52:00 · answer #2 · answered by hsueh010 7 · 0⤊ 0⤋
they run continuous idleing fuel. The PSI will jump higher depending on how far your foot goes down on the accelerator.. if your not always driving it pedal to the medal your fuel pump will last much longer! : )~
2007-03-27 02:21:55 · answer #3 · answered by anthony conant 2 · 0⤊ 0⤋
They run continuously while the key is "On". The fuel just runs in a closed loop until it is required by the motor.
2007-03-26 16:51:18 · answer #4 · answered by ButwhatdoIno? 6 · 0⤊ 0⤋