Monty made reference to an EFI fuel pump controller in Merlin's post a few days ago, so I started looking at them. I have an Aeromotive 1000 hp pump, and Jeg's stocks a matching controller for $189. From the description, it sounds like it would vary pump rpm while the engine is running, but wouldn't that impact fuel rail pressure? Maybe the regulator is able to compensate for the decreased flow and still keep the rails at full pressure?

-Joe



[Modified by Flareside, 12:42 PM 2/14/2002]

 

The fuel pressure regulator regulates the fuel pressure (;) ), not the pump. The pump controller varies the pump speed based on engine rpm (via a connection to the POINTS wire on your FAST ecm), thus reducing the fuel volume to match the needs of the engine, the fuel pressure regulator would still maintain the set fuel pressure, as you said. The benefit of this is that your fuel pump will last longer because it only has to work as hard as it needs to, rather than full speed all the time. Also, since the fuel pump is not at full speed all the time, it doesn't add as much heat to the fuel, possibly making a small increase in power. With the pump at full speed/volume all the time, the fuel pressure regulator is just returning all the excess fuel to the tank.

The Aeromotive fuel pump controller has an adjustment where you can determine at what rpm the fuel pump will go to fuel speed/volume. Additionally, it comes with an override toggle switch which allows you to instantly bring the pump up to fuel speed/volume.


[Modified by Monty, 11:44 AM 2/14/2002]


[Modified by Monty, 11:52 AM 2/14/2002]

 

Thanks for the clarification Monty. I guess I don't think of the function of the regulator correctly. Somehow, I got the idea in my head that if I altered the pressure at the pump, that I would also have to make an adjustment at the regulater to maintain the same pressure level at the rails.

I'm thinking of how my air compressor regulator works, and it's just as you described. Changes in pressure in the storage tank don't cause a change in pressure at the air tool.