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Fuel Pump

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BobbyPaulk(at)comcast.net
Guest

Posted: Mon Jun 18, 2012 5:28 am Post subject: Fuel Pump

p { margin: 0; }List

I have the Dynon engine monitor in my 601 with the Low Fuel pressure set to 2.0 psi. This past Sat on take off roll the pressure went to 1.8 and the alarm sounded. I hit the boost pump and elected to keep going when the pressure came up to 2.3 Psi. At altitude (1500' ) I turned off the boost pump after reducing power and the pressure stabilized at 2.4 psi. I decide to experiment with throttle settings and at full power the pressure again went to 1.8 psi. This happened 3 or 4 times with the same result. Normally the pressure stays at 2.3 or 2.4 at full throttle. Taxiing out the pressure is stable at 3.0.  As an old plumber I understand that when the flow increases the pressure will drop somewhat. My question is two fold. Is this a sign of the pump failing soon??  How long should the fuel pump last ( hours )? Also what would be a minimum safe pressure at take off power?



I would like to hear from Pete at Jabiru USA on this issue.

Thank you 



Bobby  ( age 74 )

Zodiac 601 XL "B"

Jabiru  3300  S/N  1141

Sensenich 64" x 51" Prop

Bing Carb 260 Main & 285 Needle Jet

Status - Flying  153 hrs. 

 [quote][b]

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pete(at)usjabiru.com
Guest

Posted: Mon Jun 18, 2012 7:14 am Post subject: Fuel Pump

Minimum fuel pressure is 0.5 psi.Â  I would set your alarm to a more realistic number of .5 to 1.0 psi.Â  Fuel pumps last a long time and have been relatively trouble free.Â  I think Iâ€™ve only sold a half dozen in 12 years with 2300 engines out there.

 

Pete Krotje

Jabiru USA Sport Aircraft, LLC

2842 Hwy 231N

Shelbyville, TN 37160

931-680-2800

 

 

 

From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of BobbyPaulk(at)comcast.net

Sent: Monday, June 18, 2012 8:28 AM

To: jabiruengine-list(at)matronics.com

Subject: Fuel Pump

 

List

I have the Dynon engine monitor in my 601 with the Low Fuel pressure set to 2.0 psi. This past Sat on take off roll the pressure went to 1.8 and the alarm sounded. I hit the boost pump and elected to keep going when the pressure came up to 2.3 Psi. At altitude (1500' ) I turned off the boost pump after reducing power and the pressure stabilized at 2.4 psi. I decide to experiment with throttle settings and at full power the pressure again went to 1.8 psi. This happened 3 or 4 times with the same result. Normally the pressure stays at 2.3 or 2.4 at full throttle. Taxiing out the pressure is stable at 3.0.  As an old plumber I understand that when the flow increases the pressure will drop somewhat. My question is two fold. Is this a sign of the pump failing soon??  How long should the fuel pump last ( hours )? Also what would be a minimum safe pressure at take off power?



I would like to hear from Pete at Jabiru USA on this issue.

Thank you 



Bobby  ( age 74 )

Zodiac 601 XL "B"

Jabiru  3300  S/N  1141

Sensenich 64" x 51" Prop

Bing Carb 260 Main & 285 Needle Jet

Status - Flying  153 hrs. 



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jerryvmd

Joined: 18 Apr 2008
Posts: 25

Posted: Mon Jun 18, 2012 8:20 am Post subject: Fuel Pump

Bobby,

     I would check your fuel filter.Â  Sounds like restricted flow at time     of greatest need (high RPM), only need for minimal flow     (idle/cruise)

     Jerry

     On 6/18/2012 9:28 AM, BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net) wrote:     [quote]       p { margin: 0; }                p { margin: 0; }         List

           I have the Dynon engine monitor in my 601 with the Low Fuel           pressure set to 2.0 psi. This past Sat on take off roll the           pressure went to 1.8 and the alarm sounded. I hit the boost           pump and elected to keep going when the pressure came up to           2.3 Psi. At altitude (1500' ) I turned off the boost pump           after reducing power and the pressure stabilized at 2.4 psi. I           decide to experiment with throttle settings and at full power           the pressure again went to 1.8 psi. This happened 3 or 4 times           with the same result. Normally the pressure stays at 2.3 or           2.4 at full throttle. Taxiing out the pressure is stable at           3.0.Â  As an old plumber I understand that when the flow           increases the pressure will drop somewhat. My question is two           fold. Is this a sign of the pump failing soon??Â  How long           should the fuel pump last ( hours )? Also what would be a           minimum safe pressure at take off power?

           

           I would like to hear from Pete at Jabiru USA on this issue.

           Thank you 

           

           BobbyÂ  ( age 74 )

           Zodiac 601 XL "B"

           JabiruÂ  3300Â  S/NÂ  1141

           Sensenich 64" x 51" Prop

           Bing Carb 260 Main & 285 Needle Jet

           Status - FlyingÂ  153 hrs. 

           

           

           

           

         

       

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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Tue Jun 19, 2012 1:40 pm Post subject: Fuel Pump

Bobby:



At full throttle the carb float valve will be open more and longer and as your plumbing experience denotes - high flow equals lower pressure.  

The boost pump should be checked for operation at start-up, during Mag check, and ON for Takeoff and Landing.  Once stabilized in cruse the pump should be turned off.  

 



Life expectancy of a fuel pump - Well which fuel pump do you have?  The Facet fuel pump will last for years and years.  I use one at work for pumping diesel in a test apparatus and it has performed flawless for thousands of hours.

 



Your fuel pressure - Sure sounds acceptable to me.  I would not concern myself with 0.1 and 0.2 PSI of change.  The question that comes to my mind is the accuracy of the gauge, can it be trusted for such a small change and is it temperature compensating?  The minimum safe pressure should be called out by the engine manufacture as well as the carb manufacture.  Example: A low wing plane with both a electric fuel pump and an engine driven pump only requires 0.5 PSI as Min.  Yet the gauge always shows about 4 to 6 PSI.  

 What is important is the fuel line size.  Volume flow is more important than pressure.  If the engine is being leaned by a restriction in fuel flow you will never get the power you want.  This is a case of Bigger is Better.

 



Take care you O'l Honey Dipper.

Barry



On Mon, Jun 18, 2012 at 9:28 AM,  <BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)> wrote:

 [quote]List

I have the Dynon engine monitor in my 601 with the Low Fuel pressure set to 2.0 psi. This past Sat on take off roll the pressure went to 1.8 and the alarm sounded. I hit the boost pump and elected to keep going when the pressure came up to 2.3 Psi. At altitude (1500' ) I turned off the boost pump after reducing power and the pressure stabilized at 2.4 psi. I decide to experiment with throttle settings and at full power the pressure again went to 1.8 psi. This happened 3 or 4 times with the same result. Normally the pressure stays at 2.3 or 2.4 at full throttle. Taxiing out the pressure is stable at 3.0.  As an old plumber I understand that when the flow increases the pressure will drop somewhat. My question is two fold. Is this a sign of the pump failing soon??  How long should the fuel pump last ( hours )? Also what would be a minimum safe pressure at take off power?

 

I would like to hear from Pete at Jabiru USA on this issue.

Thank you 



Bobby  ( age 74 )

Zodiac 601 XL "B"

Jabiru  3300  S/N  1141

Sensenich 64" x 51" Prop

Bing Carb 260 Main & 285 Needle Jet

 Status - Flying  153 hrs. 

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