Does a Ecotec fuel pump always stay on when running?
Or does it switch on and off as needed?

Thx

I would assume it stays running to hold a certain PSI in the fuel line. As soon as the pump kicks off the fuel pressure drops and you would feel the car start running weird almost instantly.


- Your not-so-local, untrained, uncertified, backyard mechanic. But my @!#$ runs

all fuel injection pumps stay running when the car is running

gm turns them on for 2 seconds at key on , then constant once you start it and its running

[quote=97cavie24ls(™)]all fuel injection pumps stay running when the car is running

that's not true

but yes the pump in jbodys run constantly

NeedTurbo wrote:Does a Ecotec fuel pump always stay on when running?
Or does it switch on and off as needed?{/quote]

It stays running. Your fuel rail has a return line and thus a pressure regulator on it to keep the pressure up. If your pump was to stop, while you were cruising down the road at say... 60mph, it would be a matter of seconds before you would notice it.

As far as switching off, pretty much any car I can't see the pump "switching off". I could see some using PWM to run the pump, which rapidly turns the motor on and off, but it happens so fast that you wouldn't notice a difference.





www.gmscf.com

Darkstars wrote:[quote=97cavie24ls(™)]all fuel injection pumps stay running when the car is running

that's not true

but yes the pump in jbodys run constantly

ok mister VW with mechanical injection , lol

if the pump isnt running , or mechanically pumping , then the fuel pressure will die off and the motor will loose power , i dont know of any pulse pump systems

and hybrids are a different animal

All return less fuel systems are pulse width modulated.