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fuel pump usage

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cjay

Joined: 15 Dec 2007
Posts: 53

Posted: Sat Mar 13, 2010 9:32 am Post subject: fuel pump usage

Great responses on the approach speed, very helpful.  My second item that seems to draw some differing approaches and I suspect there isn't one right answer is the use of the fuel pump.



I've seen some who use it strictly on starting to those that use it liberally in the IMPORTANT zones, i.e., takeoff, descent, approach, landing.   I know the latter is for safety, but would love to hear technical reasons why its a good idea. 



Also, I've seen some recommend 1-3 seconds on pre start to 3-10 seconds.  I suspect the veterans listen to the fuel pressure build up and don't rely on their watch?



Anyone care to share your boost lore? 

 

cjay

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robin1(at)mrmoisture.com
Guest

Posted: Sat Mar 13, 2010 9:50 am Post subject: fuel pump usage

For me it's:  

   

<![if !supportLists]>·        <![endif]>Takeoff  

<![if !supportLists]>·        <![endif]>Tank Change  

<![if !supportLists]>·        <![endif]>(long final) Landing  

   

Regarding starting, my engine likes 5-6 seconds of prime when cold. 10 seconds was too long and 3 seconds was not enough.  

Once started (even for 2 minutes) my setup requires a flooded start procedure which seems to work every time.  

   

As you said there may be no one “right” answer but I do PERSONALLY believe there are wrong answers like not using the boost pump of takeoff and short final.   

   

Robin  

   

   

--

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dlm46007(at)cox.net
Guest

Posted: Sat Mar 13, 2010 9:53 am Post subject: fuel pump usage

Hot starts are: throttle cracked, mixture idle cutoff, boost pump on, starter, enrichen as it fires, release starter to both.  

Flooded start are mixture idle cutoff, ignition off, throttle full, crank at least three blades then hot start.    

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robertbrunk(at)mac.com
Guest

Posted: Sat Mar 13, 2010 12:50 pm Post subject: fuel pump usage

I operate pump until flow meter shows rate of flowat start up then  

turn it off. I do use it each time I change tanks every 30 minutes.  

Then off again. That is it. Robert



Sent from my iPhone



Robert E. Brunkenhoefer

Brunkenhoefer Law Firm, P.C.

606 N. Carancahua Street

Suite 1200

Corpus Christi, Texas 78476

Phone: 361-888-8808

Facsimile: 361-888-6753

robert(at)brunklaw.com



On Mar 13, 2010, at 11:32 AM, cjay <cgfinney(at)yahoo.com> wrote:



 	  Quote: 	
		   



 Great responses on the approach speed, very helpful.  My second item  

 that seems to draw some differing approaches and I suspect there  

 isn't one right answer is the use of the fuel pump.



 I've seen some who use it strictly on starting to those that use it  

 liberally in the IMPORTANT zones, i.e., takeoff, descent, approach,  

 landing.   I know the latter is for safety, but would love to hear  

 technical reasons why its a good idea.



 Also, I've seen some recommend 1-3 seconds on pre start to 3-10  

 seconds.  I suspect the veterans listen to the fuel pressure build  

 up and don't rely on their watch?



 Anyone care to share your boost lore?



 cjay





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=290199#290199

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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robin1(at)mrmoisture.com
Guest

Posted: Sat Mar 13, 2010 1:50 pm Post subject: fuel pump usage

Truth be told I don't always use it on tank changes. Just left over

(good) habit from my trainer days. I never saw the downside to this

procedure.



Robin



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dave.saylor.aircrafters(a
Guest

Posted: Sat Mar 13, 2010 3:52 pm Post subject: fuel pump usage

Besides starting, the boost pump provides fuel pressure to keep the engine

running in the event of a mechanical pump failure.  A fuel injected engine

won't produce power without fuel pressure from the mechanical and/or boost

pump.



Everyone gets to decide for themselves when they would LEAST like an engine

failure, so you hear different scenarios for using the boost pump.  I turn

it on for take-off to cruise, and as part of my Gas-Mixture-Prop-Pump check

for landing.  I'm not sure what the reasoning would be for turning it on to

switch tanks, but it can't hurt.

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ronrvbuilder(at)bigpond.c
Guest

Posted: Sun Mar 14, 2010 3:52 am Post subject: fuel pump usage

I’ve also read some articles about making sure that you have maximum fuel flow during takeoff to ensure adequate cylinder cooling.  Using the boost pump is supposed to help achieve this.   

   

Cheers  

Ron  

VH-XRM flying in Oz  

         

  

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Robin Marks

 Sent: Sunday, 14 March 2010 4:46 AM

 To: rv10-list(at)matronics.com

 Subject: RE: fuel pump usage  

  

   

For me it's:  

   

<![if !supportLists]>·         <![endif]>Takeoff  

<![if !supportLists]>·         <![endif]>Tank Change  

<![if !supportLists]>·         <![endif]>(long final) Landing  

   

Regarding starting, my engine likes 5-6 seconds of prime when cold. 10 seconds was too long and 3 seconds was not enough.  

Once started (even for 2 minutes) my setup requires a flooded start procedure which seems to work every time.  

   

As you said there may be no one “right” answer but I do PERSONALLY believe there are wrong answers like not using the boost pump of takeoff and short final.   

   

Robin  

   

   

-----Original Message-----

 From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of cjay

 Sent: Saturday, March 13, 2010 9:33 AM

 To: rv10-list(at)matronics.com

 Subject: fuel pump usage  

   

--> RV10-List message posted by: "cjay" <cgfinney(at)yahoo.com>  

   

Great responses on the approach speed, very helpful.  My second item that seems to draw some differing approaches and I suspect there isn't one right answer is the use of the fuel pump.  

   

I've seen some who use it strictly on starting to those that use it liberally in the IMPORTANT zones, i.e., takeoff, descent, approach, landing.   I know the latter is for safety, but would love to hear technical reasons why its a good idea.   

   

Also, I've seen some recommend 1-3 seconds on pre start to 3-10 seconds.  I suspect the veterans listen to the fuel pressure build up and don't rely on their watch?  

   

Anyone care to share your boost lore?   

   

cjay  

   

   

   

   

Read this topic online here:  

   

http://forums.matronics.com/viewtopic.php?p=290199#290199  

   

   

   

   

   

   

   

   

to browse  

Un/Subscription,  

Browse, Chat, FAQ,  

more:  

http://www.matronics.com/Navigator?RV10-List  

   

Web Forums!  

http://forums.matronics.com  

   

support!  

http://www.matronics.com/contribution  

   

   

   

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Sun Mar 14, 2010 6:50 am Post subject: fuel pump usage

Actually, use of the boost pump will have virtually no effect on your 

fuel flow for takeoff. Your fuel servo delivers fuel pressure to the 

nozzles based on the impact air hitting the tubes in the intake, e.g. 

mass airflow. Whether you deliver minimum fuel pressure required or 

maximum pressure allowed to the servo, it is going to deliver the same 

pressure to the nozzles if it is working correctly. The boost pump is 

unlikely to increase the pressure delivered by more than 10% of total 

pressure..e.g. from 24 to 26, not a big change.



On 3/14/2010 2:28 AM, Ron McGann wrote:

[quote] I’ve also read some articles about making sure that you have maximum

 fuel flow during takeoff to ensure adequate cylinder cooling. Using the

 boost pump is supposed to help achieve this.



 Cheers



 Ron



 VH-XRM flying in Oz



 ------------------------------------------------------------------------



 *From:* owner-rv10-list-server(at)matronics.com

 [mailto:owner-rv10-list-server(at)matronics.com] *On Behalf Of *Robin Marks

 *Sent:* Sunday, 14 March 2010 4:46 AM

 *To:* rv10-list(at)matronics.com

 *Subject:* RE: fuel pump usage



 For me it's:



 · Takeoff



 · Tank Change



 · (long final) Landing



 Regarding starting, my engine likes 5-6 seconds of prime when cold. 10

 seconds was too long and 3 seconds was not enough.



 Once started (even for 2 minutes) my setup requires a flooded start

 procedure which seems to work every time.



 As you said there may be no one “right” answer but I do PERSONALLY

 believe there are wrong answers like not using the boost pump of takeoff

 and short final.



 Robin



 --

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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