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To:  lml@lancaironline.net
Date: Tue, 21 Jul 2009 08:18:14 -0400
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From: mmcmanus@grandecom.net
Subject: Re: [LML] Fuel flow issue
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The fuel pressure in my 360 varies when the temperature is hotter than  
normal.  I ALWAYS have the boost pump on for takeoff and landing.   
However, especially after a restart on a hot day, the fuel flow will  
go up and down in climb.  Once I level off and the oil temp goes down,  
the fuel flow stablizes.  What was your oil temp, or the outside air  
temp during your fuel flow excursions?
Matt McManus
LNC2 360


Quoting Scott Keighan <scottekeighan@sympatico.ca>:

> I have a question.
> Today while flying my first take off was normal.  The second take  
> off my fuel flow
> on takeoff went up to 19.0gph then back down to 12.2 after rotation then
> slowly went back to normal.  Cruised around ok for 15 min then back  
> to the airport
> for a couple of circuits.  No electric boost pump except I turned it  
> on for landing.
> Next take off the same thing but max Flow on take off was 18.5gph  
> for half a second then
> it went back down to 14.5.  Turn on the electric boost and within 2  
> seconds its back up to 20.5gph.
> Landed and on a back track for another circuit the engine stalled.   
> Restarted right away with
> no issues.  Next circuit same issue.  Up to 18.0gph then down to  
> 15.0 while rolling down
> the runway, hit the boost pump and within 2 seconds all is well.  On  
> downwind switch the
> boost pump off and the fuel flow stays in normal ranges.  Take off  
> left or right tank, same issue.
> Fuel 25 gal in each tank.
>
> Fuel pressure stays normal the whole time.  I checked for water in  
> the tanks and gascolator.
> I checked underneath the cowl for anything out of place.
>
> Engine fuel pump rebuild required??  What do you think??
> Any advise would be appreciated.
>
> Thanks
> Scott K
> IO-550-G