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Engine driven fuel pump

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lrsecaldwell(at)earthlink
Guest

Posted: Mon Mar 31, 2008 3:28 pm Post subject: Engine driven fuel pump

My fuel pressure vary on my O-360 with 55 hours.



They do not jump around, but over periods of time vary from 1 to 5 pis..



IThe electric boost pump always brings up the pressure.



Any suggestions.



Roger

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kboatright1(at)comcast.ne
Guest

Posted: Mon Mar 31, 2008 3:48 pm Post subject: Engine driven fuel pump

Can you correlate the pressure fluctuation to climbs, descents, etc?



Many (most?) of us see low readings when climbing and immediately after 

reaching cruise altitude and high readings in descents and upon changing to 

a lower altitude.  The error corrects itself after a few minutes at a steady 

altitude.



If you check the archives, you'll see lots of commentary on the subject. 

The leading theory (IMO) is that there is a problem using automotive 

pressure senders in aviation applications because they give inaccurate 

pressure readings since they are not designed for fast or significant 

changes in elevation. Essentially, the static port in automotive sensors is 

undersized for our application, so the static pressure in the sensors 

doesn't keep up with the altitude of the aircraft. Sort of like a plugged 

static system in an airplane will give you incorrect altitude and airspeed 

readings.



KB



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ronlee(at)pcisys.net
Guest

Posted: Mon Mar 31, 2008 4:18 pm Post subject: Engine driven fuel pump

Unless there is a problem, that is normal for my RV-6A O-360.

Been doing it for 1200 hours or so.  Never quit on me yet.  This

is common.  Feel free to look for a problem but don't worry

about if it everything appears normal otherwise.



Ron Lee



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N122RL(at)aol.com
Guest

Posted: Tue Apr 01, 2008 7:47 am Post subject: Engine driven fuel pump

Check to be sure your gasolator has no leaks. Had the same problem, turned  out the gasolator was sucking air. 

 Bob 6A o320

  

  In a message dated 3/31/2008 7:29:51 P.M. Eastern Daylight Time,  lrsecaldwell(at)earthlink.net writes:

  	  Quote: 	
		  -->    RV-List message posted by: "Lapsley R. and Sandra E. Caldwell"    <lrsecaldwell(at)earthlink.net>



My fuel pressure vary on my O-360    with 55 hours.



They do not jump around, but over periods of time vary    from 1 to 5 pis..



IThe electric boost pump always brings up the    pressure.



Any  =========================

	




Create a Home Theater Like the Pros. Watch the video on AOL Home.

  [quote][b]

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