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  #1  
Old 11-23-2017, 09:09 PM
fbrewer fbrewer is offline
 
Join Date: Sep 2017
Location: Leander
Posts: 20
Default Proper use of fuel boost pump - io360

Our RV6 with an io360 has a fuel boost pump.

Our checklist calls for ON for engine start, but does not address it thereafter.

What is the proper usage of the boost pump?

What is the purpose of the fuel boost pump?
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  #2  
Old 11-23-2017, 09:52 PM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
Posts: 487
Default Boost pump

Manufacturer checklists for fuel injected low wing planes that are very similar to our RV’s (Mooneys & Arrows) call for boost pump ON before start for priming then OFF. ON for Takeoff and Landing. All other times the electric boost pump is usually OFF. I like to turn the pump ON when taking the runway for Takeoff and leave it ON until about 1000’ agl. Approaching to land it comes ON when I run the Before Landing Checklist or Flow or no later than entering the pattern, then OFF after landing. Boost pump’s main purpose is to back up the engine driven pump in case of failure and to provide fuel flow for starting.

Don Broussard
RV9 Rebuild in Progress
57 Pacer

Last edited by cajunwings : 11-23-2017 at 09:58 PM.
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  #3  
Old 11-24-2017, 07:36 AM
fbrewer fbrewer is offline
 
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Location: Leander
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cajunwings,

Thanks for the confirmation.
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  #4  
Old 11-24-2017, 08:01 AM
Aggie78 Aggie78 is offline
 
Join Date: May 2014
Location: Fort Worth, Texas
Posts: 315
Default Switching tanks...

I use the aux pump to ensure an uninterrupted supply of fuel under positive pressure when switching from one tank to the other.

The drill goes something like: Boost pump-ON; Note fuel pressure rise; Switch tanks; After 30 seconds (if no engine anomalies or roughness is noted); Boost pump-OFF.
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RV-7, bought
N75WV
YIO-360-M1B
T67-Hicks Airport, Texas
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  #5  
Old 11-24-2017, 08:25 AM
jim plaster jim plaster is offline
 
Join Date: Dec 2012
Location: N.C.
Posts: 140
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Boost pump on for priming during engine start. Pump on during fuel tank switching, downwind to land and takeoff...
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  #6  
Old 11-24-2017, 08:26 AM
OkieDave OkieDave is offline
 
Join Date: Mar 2017
Location: Oklahoma
Posts: 52
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Quote:
Originally Posted by cajunwings View Post
Manufacturer checklists for fuel injected low wing planes that are very similar to our RV’s (Mooneys & Arrows) call for boost pump ON before start for priming then OFF. ON for Takeoff and Landing. All other times the electric boost pump is usually OFF. I like to turn the pump ON when taking the runway for Takeoff and leave it ON until about 1000’ agl. Approaching to land it comes ON when I run the Before Landing Checklist or Flow or no later than entering the pattern, then OFF after landing. Boost pump’s main purpose is to back up the engine driven pump in case of failure and to provide fuel flow for starting.
This is going to depend upon the installation. The Cherokees in which I trained used the pump on takeoff and landing, but I once lost an engine in a Baron right at touchdown due to flooding. Scared the heck out of me!
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Old 11-24-2017, 08:34 AM
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mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 1,427
Default

Ditto to above plus....

If you do a quick turn and have a hot engine, once you start it, the engine quite often stumbles a lot with vapour in the lines. Running the pump helps - I know it depends if you have a return line set up, but it helps either way.
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  #8  
Old 11-24-2017, 08:53 AM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
Posts: 487
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Quote:
Originally Posted by OkieDave View Post
This is going to depend upon the installation. The Cherokees in which I trained used the pump on takeoff and landing, but I once lost an engine in a Baron right at touchdown due to flooding. Scared the heck out of me!
Agreed: Continental engine installations in Barons, 210’s Bonanzas etc are quite different from the “normal” RV/Lyc setup.

Don B
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