Mailing List flyrotary@lancaironline.net Message #18699
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Fuel system pressures
Date: Sun, 13 Mar 2005 20:39:15 -0600
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message

What fuel pressure do you want from the fuel pump to the fuel rails for a 20B/turbo? I recognize that you need a fuel pressure regulator to maintain a constant pressure differential for the injectors.

The "standard" pressure is 3 bar, or 43.5 psi.  Mazda tended to run a bit lower normally, but not that much, and there's no reason to care unless you're planning to use a stock ECU.  With a turbo, you definitely need a regulator that is referenced to manifold pressure, so the difference between the pressure in the fuel rails, and the pressure in the intake stays the same, regardless of MAP.  That can be confusing, so let me know if you don't follow that.   

What is the pressure range for the fuel pressure regulator?

See above :-)

I have taken my fuel system design from Marv

You're screwed then... Just kidding :-)

Rusty (wishing I had a flying plane again...)

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