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fuel boost pump

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lbgjb10

Joined: 28 Jan 2008
Posts: 67

Posted: Thu Dec 04, 2008 3:12 pm Post subject: fuel boost pump

Most high performance planes I've flown, I would use the boost pump on takeoff and landing, and possible thru the climb.  Any concensus on the IO540?  A couple times when it has been hot on long times my fuel pressure has started to drop a little and the fuel boost pump fixes the problem.  larry

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_________________
Larry and Gayle N104LG

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Thu Dec 04, 2008 3:38 pm Post subject: fuel boost pump

Larry,



If you have a regular IO-540, then the RV-10 isn't one of those

planes that you have to be careful of running the boost pump on.

So it's really a good idea to use it on takeoff.   I don't

ever remember to turn it off, so I got in the habit of not

using it.  It works ok, but, for the first few seconds after

going full power, the pressure sometimes drops a bit, enough

to trip my 16 psi alarm level.  I have my pump switch right

next to my throttle, so I just flick my thumb and it's on.

What would be better of me, is to just remember all the time. 

I'd say on maybe 1 of 10 takeoffs I'd get a warning if I didn't

use the boost pump, and I've waited it out many times,

just to see how low it would go, and it didn't get too

awful. But I still think it's a good idea to climb that first

500' with the pump on.  Beyond that, once you're more able

to think for 5 seconds and glide if there was a problem, you

may as well just turn it off.



Then, on extended climbs, if you let the airspeed get low,

I've noticed that the pressure may start to waver and decrease.

It also trips the alarm.  I'm not sure why this happens...we've

talked about it before, but my best guess is that it's heating.

Heating of the fuel because of less airflow through the cowl.

Dropping the nose to 120kts or more helps.  And I only have

the problem when climbing at full WOT.  As soon as I level off,

and lean, it's fine.  It happens maybe 6-7000' into a climb.

I usually turn it on for 10 seconds whenever I get that happening

in a climb.  Usually then I can turn it off, after I drop the

nose a little, and it's ok from there on.



For landing, just like for taking off, it's best practice to

use it.  Although, for landing, you won't have any problem

with pressure at all, unless you have a pump go bad.



Tim Olson - RV-10 N104CD - Flying

do not archive

lbgjb10 wrote:

 	  Quote: 	
		   

 

 Most high performance planes I've flown, I would use the boost pump

 on takeoff and landing, and possible thru the climb.  Any concensus

 on the IO540?  A couple times when it has been hot on long times my

 fuel pressure has started to drop a little and the fuel boost pump

 fixes the problem.  larry

 

 -------- Larry and Gayle N104LG

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p 17677#217677

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Dave(at)AirCraftersLLC.co
Guest

Posted: Thu Dec 04, 2008 5:28 pm Post subject: fuel boost pump

My understanding is that the boost pump should be on any time that a failure

of the engine-driven pump would cause a critical situation, i.e., take-off

and landing or other low-altitude operations.  Unlike most high-wing

carbureted airplanes, ours won't run without a fuel pump;  therefore we have

redundant fuel pressure sources.  There's nothing to draw fuel into the

engine like head pressure or a carb venturi.  Plus, the fuel servo needs a

certain minimum inlet fuel pressure to meter correctly.  The book says 14

psi;  it might tolerate something less, but it won't draw fuel in like a

carb.



At altitude, you would probably have time to turn on the boost pump as part

of the emergency procedures should the engine quit.  On take-off, landing,

or during a go-around (add you own scenario here), you don't need the boost

pump added to your to-do list, so turn it on before you get too busy.



I don't think you can hurt anything by leaving it on, but I guess you would

be using up pump life.  However, on my installation with the fuel flow

transducer in the stock location just downstream from the boost pump,

turning on the pump adds about 4 GPH to the fuel flow indication.  I know it

isn't affecting the actual fuel flow but for some reason the transducer

doesn't like the pump.  We saw the same thing in another -10.  The owner had

us switch the transducer to downstream of the servo, and it now works

perfectly all the time.



Dave Saylor

AirCrafters LLC

140 Aviation Way

Watsonville, CA 

831-722-9141

831-750-0284 CL

www.AirCraftersLLC.com

--

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lbgjb10

Joined: 28 Jan 2008
Posts: 67

Posted: Thu Dec 04, 2008 5:39 pm Post subject: Re: fuel boost pump

great answers, thanks. larry

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Larry and Gayle N104LG

jesse(at)saintaviation.co
Guest

Posted: Thu Dec 04, 2008 5:46 pm Post subject: fuel boost pump

This would sum up my recommendations exactly.  The increased fuel flow  

reading caused by the pulses in the pump (I am told) actually can act  

as a reminder to turn it off in cruise.



Jesse Saint

Saint Aviation

jesse(at)saintaviation.com

352-427-0285



Sent from my iPhone



On Dec 4, 2008, at 8:27 PM, "Dave Saylor" <Dave(at)AirCraftersLLC.com>  

wrote:



[quote] 

 >



 My understanding is that the boost pump should be on any time that a  

 failure

 of the engine-driven pump would cause a critical situation, i.e.,  

 take-off

 and landing or other low-altitude operations.  Unlike most high-wing

 carbureted airplanes, ours won't run without a fuel pump;  therefore  

 we have

 redundant fuel pressure sources.  There's nothing to draw fuel into  

 the

 engine like head pressure or a carb venturi.  Plus, the fuel servo  

 needs a

 certain minimum inlet fuel pressure to meter correctly.  The book  

 says 14

 psi;  it might tolerate something less, but it won't draw fuel in  

 like a

 carb.



 At altitude, you would probably have time to turn on the boost pump  

 as part

 of the emergency procedures should the engine quit.  On take-off,  

 landing,

 or during a go-around (add you own scenario here), you don't need  

 the boost

 pump added to your to-do list, so turn it on before you get too busy.



 I don't think you can hurt anything by leaving it on, but I guess  

 you would

 be using up pump life.  However, on my installation with the fuel flow

 transducer in the stock location just downstream from the boost pump,

 turning on the pump adds about 4 GPH to the fuel flow indication.  I  

 know it

 isn't affecting the actual fuel flow but for some reason the  

 transducer

 doesn't like the pump.  We saw the same thing in another -10.  The  

 owner had

 us switch the transducer to downstream of the servo, and it now works

 perfectly all the time.



 Dave Saylor

 AirCrafters LLC

 140 Aviation Way

 Watsonville, CA

 831-722-9141

 831-750-0284 CL

 www.AirCraftersLLC.com

 --

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partner14

Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas

Posted: Thu Dec 04, 2008 6:29 pm Post subject: fuel boost pump

Best reminder for me is a light.  Turn the pump on, a blue light goes on.  Hopefully that will trigger the appropriate response.

 Don



--- On Thu, 12/4/08, Jesse Saint <jesse(at)saintaviation.com> wrote:



 [quote]From: Jesse Saint <jesse(at)saintaviation.com>

Subject: Re: fuel boost pump

To: "rv10-list(at)matronics.com" <rv10-list(at)matronics.com>

Date: Thursday, December 4, 2008, 5:46 PM



[quote]--> RV10-List message posted by: Jesse Saint <jesse(at)saintaviation.com>  This would sum up my recommendations exactly.  The increased fuel flow reading caused by the pulses in the pump (I am told) actually can act as a reminder to turn it off in cruise.  Jesse Saint Saint Aviation jesse(at)saintaviation.com 352-427-0285  Sent from my iPhone  On Dec 4, 2008, at 8:27 PM, "Dave Saylor" <Dave(at)AirCraftersLLC.com> wrote:  > --> RV10-List message posted by: "Dave Saylor" <Dave(at)aircraftersllc.com> >  > My understanding is that the boost pump should be on any time that a failure > of the engine-driven pump would cause a critical situation, i.e., take-off > and landing or other low-altitude operations.  Unlike most high-wing > carbureted airplanes, ours won't run without a fuel pump;  therefore we have > redundant fuel pressure sources.  There's nothing to draw fuel into the > engine like head pressure or a carb venturi.  Plus, the fuel servo needs a > certain minimum inlet fuel pressure to meter correctly.  The book says 14 > psi;  it might tolerate something less, but it won't draw fuel in like a > carb. >  > At altitude, you would probably have time to turn on the boost pump as part > of the emergency procedures should the engine quit.  On take-off, landing, > or during a go-around (add you own scenario here), you don't need the boost > pump added to your to-do list, so turn it on before you get too busy. >  > I don't think you can hurt anything by leaving it on, but I guess you would > be using up pump life.  However, on my installation with the fuel flow > transducer in the stock location just downstream from the boost pump, > turning on the pump adds about 4 GPH to the fuel flow indication.  I know it > isn't affecting the actual fuel flow but for some reason the transducer > doesn't like the pump.  We saw the same thing in another -10.  The owner had > us switch the transducer to downstream of the servo, and it now works > perfectly all the time. >  > Dave Saylor > AirCrafters LLC > 140 Aviation Way > Watsonville, CA > 831-722-9141 > 831-750-0284 CL > www.AirCraftersLLC.com >  >  > --

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