A much better idea is to use a PWM circuit along with a pressure sensor.geezer101 wrote:is it possible to drop fuel pressure from an electric pump by lowering the input voltage to it?
If you are handy with a soldering iron Jaycar have a cheap 10A 12VDC Motor Speed Controller Kit KC5225 or you can buy a pre-built 9 - 28VDC 10A PWM Motor Speed Controller.
There would be a little bit of work required to adapt a pressure sensor output to allow it to what you need, but not much.
The reason for the pressure sensor is to be able to vary the fuel flow, depending on how the car is being driven. A constant low voltage may cause the pump to stall once it's up to pressure, this would destroy it in no time.
This would only work with the standard gear head style pumps (normal EFI style pumps),
NOT the "Solid State Electric Fuel Pumps", ie the ones that go "clack, clack, clack" most of the time..
Cheers.