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fuel pressure high

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cdupuis

Joined: 05 May 2012
Posts: 11

Posted: Tue Jul 03, 2012 10:53 am Post subject: fuel pressure high

Hi all,



My fuel pressure is 11 psi at full speed on my 447.  I teed the two lines off the pump together then to the single carb.  What's normally done?



Thanks!

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Tue Jul 03, 2012 8:25 pm Post subject: fuel pressure high

Are you having any problems with fuel overflowing the float bowl? The Rotax installation manual, page 15-1 shows the single outlet fuel pump (Mikuni DF44) used with the single carb engines. On page 15-2 it speaks of using an electric and pneumatic pump with a max pressure of 7 psi. Mikuni only lists the pump output and the DF52 at 35 liters per hour is over three times what the DF44 puts out.

Rick Girard



On Tue, Jul 3, 2012 at 1:53 PM, cdupuis <ctdupuis(at)maine.rr.com (ctdupuis(at)maine.rr.com)> wrote:

  	  Quote: 	
		  --> Kolb-List message posted by: "cdupuis" <ctdupuis(at)maine.rr.com (ctdupuis(at)maine.rr.com)>

  

 Hi all,

 

 My fuel pressure is 11 psi at full speed on my 447.  I teed the two lines off the pump together then to the single carb.  What's normally done?

 

 Thanks!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=377164#377164

 

 

 

 

 

 

 

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cdupuis

Joined: 05 May 2012
Posts: 11

Posted: Wed Jul 04, 2012 2:31 pm Post subject: Re: fuel pressure high

Hi,



Nothing leaking from the bowl.  This is my first 447 and the dual outlet is what's shown on the firefly drawing and what LEAF sent me w/ the engine.  Can you plug one outlet or is it better to go w/ the smaller pump?

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Wed Jul 04, 2012 4:58 pm Post subject: fuel pressure high

At 06:31 PM 7/4/2012, cdupuis wrote:



 

  	  Quote: 	
		  Nothing leaking from the bowl.  This is my first 447 and the dual outlet is what's shown on the firefly drawing and what LEAF sent me w/ the engine.  Can you plug one outlet or is it better to go w/ the smaller pump? 	


 Plugging one outlet or teeing them both together makes no difference as far as pressure is concerned.  Going to the smaller pump will also make no difference; the pressure is what the pulse pressure is from the crankcase.  11 psi does sound rather high; are you sure your pressure gauge is reading correctly?  Or do you also have an electric pump in line?



 -Dana

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