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Fuel pressure

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danbooker

Joined: 26 Dec 2014
Posts: 29

Posted: Mon Sep 05, 2016 6:25 pm Post subject: Fuel pressure

At 80% rpm and 80 mp, what should the fuel pressure be?  Mine is at the bottom of the green arc at about .2?  It seems like it used to be higher?  Any one know about this?

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_________________
Daniel Booker
"Stealth-Eagle Aviation"
2312457798
danbooker@hotmail.com

wlannon(at)shaw.ca
Guest

Posted: Mon Sep 05, 2016 9:20 pm Post subject: Fuel pressure

Fuel press. operating range 0.2 to 0.5 Kg./ sq. cm.  (approx. 3 to 7 psi). 

Min. idle 1.5 (2 psi)

These are Huosai numbers which I believe are the same for the M14 but can't 

confirm at this moment.



0.2 Kg/sq. cm. is actually just slightly under 3 psi and is indeed low for a 

high power setting.  I assume you mean 80% at 800 mm/hg rather than 80?

I would expect to see about 3.5 (5 psi)  for cruise and above.



Very easy to adjust press. relief valve but first ensure there is no 

evidence of leakage.   Unless the pump is very high time (high wear) should 

take only

a small adjustment to correct.   Worth checking the relief valve spring 

condition for possible corrosion damage.



Walt



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cerveirapinto(at)gmail.co
Guest

Posted: Tue Sep 06, 2016 3:17 am Post subject: Fuel pressure

Check fuel filters first



Cheers

2016-09-06 2:25 GMT+00:00 danbooker <danbooker(at)hotmail.com (danbooker(at)hotmail.com)>:

 	  Quote: 	
		  --> Yak-List message posted by: "danbooker" <danbooker(at)hotmail.com (danbooker(at)hotmail.com)>

 

 At 80% rpm and 80 mp, what should the fuel pressure be?  Mine is at the bottom of the green arc at about .2?  It seems like it used to be higher?  Any one know about this?

 

 --------

 Daniel Booker

 "Stealth-Eagle Aviation"

 2312457798

 danbooker(at)hotmail.com (danbooker(at)hotmail.com)

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=460284#460284

 

 

 

 

 

 

 

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Pedro Cerveira Pinto

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dsavarese0812(at)bellsout
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Posted: Tue Sep 06, 2016 3:57 am Post subject: Fuel pressure

Dan,

Was it higher after the engine change?

Dennis



A. Dennis Savarese

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 9/6/2016 6:54 AM, Pedro Cerveira Pinto wrote:

 	  Quote: 	
		   Check fuel filters first

 Cheers



 2016-09-06 2:25 GMT+00:00 danbooker <danbooker(at)hotmail.com 

 <mailto:danbooker(at)hotmail.com>>:



     

     <mailto:danbooker(at)hotmail.com>>



     At 80% rpm and 80 mp, what should the fuel pressure be? Mine is at

     the bottom of the green arc at about .2?  It seems like it used to

     be higher?  Any one know about this?



     --------

     Daniel Booker

     "Stealth-Eagle Aviation"

     2312457798

     danbooker(at)hotmail.com <mailto:danbooker(at)hotmail.com>





     Read this topic online here:



     http://forums.matronics.com/viewtopic.php?p=460284#460284

     <http://forums.matronics.com/viewtopic.php?p=460284#460284>



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 Pedro Cerveira Pinto

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danbooker

Joined: 26 Dec 2014
Posts: 29

Posted: Wed Oct 19, 2016 5:31 pm Post subject: Re: Fuel pressure

It took two fixes. The first item I discovered was "loose" bolts holding the fuel pump onto the accessory case. Each bolt took at least one full turn to tighten.  After tightening these bolts, I then gave the fuel pressure screw one full turn.  That raised my pressure from .18 to .3, which is right in the middle of the green arc!  Mission accomplished.  Thanks for the help.

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_________________
Daniel Booker
"Stealth-Eagle Aviation"
2312457798
danbooker@hotmail.com

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