REFLECTOR: engine driven fuel pump

[Ron Brown]

My IO360 Lycoming with Airflow Performance Aux pump (has a pressure regulator) runs 27 without the aux pump and 28-29 with it on.  Your readings appear normal for the engine pump and for the Weldon pump (I don't think they have regulator).

Ronnie
  ----- Original Message ----- 
  From: Chuck Jensen 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Thursday, August 25, 2005 12:59 PM
  Subject: RE: REFLECTOR: engine driven fuel pump


              Kent,

   

              My IO540 reads 35-36 psig whether I'm running the booster or not.  Engine rpm does not affect my reading.  So, by comparison, your number is actually a little low, though by the time you add the 540 pump plus the booster, you're at the same 34 psig.  Since it's likely neither of us have calibrated the pressure indication, it looks like your numbers are in the right ballpark.  Trend them over time to see if they change, otherwise it looks like you're good to go.

   

              Chuck

   

  -----Original Message-----
  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of kent
  Sent: Thursday, August 25, 2005 12:12 PM
  To: Velocity Aircraft Owners and Builders list
  Subject: REFLECTOR: engine driven fuel pump

   

  What fuel pressure level should be normal for an engine driven fuel pump?

  Do they compensate for rpm?

  I have an IO540 and on the ground at idle (800 rpm) my sensor says 27 psi. I have no idea but that seems high.

  When I flip on the electric Weldon fuel pump it goes up another 6 or 7 psi.

  On takeoff by the time I have the gear up and am back at 25/2500 I notice the fuel pressure is 38 or more before I turn the electric fuel pump off.

  What pressure should an engine driven fuel pump put out?

  Kent Murley



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