fuel pump controller

[F.C.]

Anyone on here using a "rising rate" fuel pump controller?
If so does it work well?
Any do's or don'ts?

[F.C.]

MarkWebb said:

I am looking at buying this one http://www.professional-products.com/secure/upload...
However having written them a no of emails I have yet to get a reply.
Your input appreciated as always

Interesting, that one does away with the regulator.
I'd imagine that any pump that works with that would need to run comfortably at lower voltages for extended periods of time, during cruise for instance.
I would think not all pumps will be linear in their voltage versus pressure curve and may have trouble if the curve is not similarly linear.
On balance I think I would like to keep a regulator and just have a low / high rpm switch over, ie. upto 2500rpm low volume above 2500rpm high volume.

[F.C.]

Max_Torque said:

I've not found a std pump you can't run on a lower voltage, providing the driving system keeps the current ripple undercontrol (ie, probably uses a synchronous rectification type architecture) as that minimises the motors torque fluctuations and hence any vibration or noise. On my twin series 044s all i hear when the system is up to pressure but engine off is a very quiet "click clack" of the pumps internal one way ball valves oscillating slightly on their seats. Once any significant fuel flow occurs (ie, anything above about warm idle) the system is completely silent as my controller drivers the pumps with a PWM frequency above the human audible spectrum.

So using a digital signal to control pump duty?

[F.C.]

I take it the carbon canister is in the vent line from the tank(s)?
what sort of size are these? weight wise what are we talking, 1KG carbon?