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  #1  
Old 04-27-2018, 11:35 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 628
Default Boost Pump Operation
So I really did search high and low for this information but no joy.

I recently bought (but have not installed) a boost pump.
I've just learned that the pump cannot be run continuously. It seems the pump recycles fuel and eventually the fuel heats up.

I don’t have plans to run it all the time...just the normal takeoff/landing/fuel switching etc....
  • Are all boost pumps like this?
  • How long CAN I run the boost pump without worrying?
  • What happens its I run it too long due to distraction or perceived need?

I know there are experienced builders on this site who recommend this pump, so I'm pretty sure the pump is high quality and reliable.
I'm just confused on how to manage it and the consequences of running it to long.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring in progress
Donated for 2021 and so should you
Last edited by mfleming : 04-27-2018 at 11:49 PM.
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  #2  
Old 04-28-2018, 03:13 AM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 3,565
Talking boost pump
Which pump? I've never forgotten to turn off the boost pump. /s
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Mickey Coggins
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  #3  
Old 04-28-2018, 04:47 AM
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DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
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Default
Quote:
Originally Posted by mfleming View Post
I've just learned that the pump cannot be run continuously. It seems the pump recycles fuel and eventually the fuel heats up.
Who was your instructor? And which pump are we talking about?
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RV-8 SS
Barrett IO-390
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  #4  
Old 04-28-2018, 11:07 AM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 628
Default
Quote:
Originally Posted by rv8ch View Post
......I've never forgotten to turn off the boost pump. /s
But if you did, how long would the pump run until there was trouble and what kind of trouble would that be

PS-I PM'ed you some more info
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring in progress
Donated for 2021 and so should you
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  #5  
Old 04-28-2018, 11:19 AM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 628
Default
Quote:
Originally Posted by DanH View Post
Who was your instructor? And which pump are we talking about?
Many instructors in the past 48 years
No boost pumps involved except for last week and that instructor did not seem to be the guru on boost pumps

I'm just trying to understand the how's and whys on boost pumps and if I made the right decision on my purchase.

PM'ed you some more info.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring in progress
Donated for 2021 and so should you
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  #6  
Old 04-28-2018, 11:55 AM
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RONSIM RONSIM is offline
 
Join Date: Feb 2008
Location: Largo, FL
Posts: 1,049
Default "Boost Pump" is also backup
to your engine-driven pump ---- I would expect mine to run continuously if my engine-driven pump failed.

Ron
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  #7  
Old 04-28-2018, 12:18 PM
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RV7A Flyer RV7A Flyer is offline
 
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Location: US
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Default
Well, *I've* never forgotten to turn the boost pump off...as far as you know.

I have the Andair pump. Rated for continuous use. I'd expect pretty much all others are the same or else, as noted, they aren't really meeting the requirement of being a backup pump in case of engine pump failure, are they?
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  #8  
Old 04-28-2018, 12:29 PM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,887
Default
This is the primer war of the alt engine crowd (where should the regulator be, and where should the bypassed fuel go). For anyone considering auto style electronic injection, this thread's for you.

Just a minute; I'm going for some popcorn.

;-)
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  #9  
Old 04-28-2018, 12:39 PM
vic syracuse vic syracuse is offline
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,678
Default RV-12iS has 2
Well, the RV-12iS has 2 boost pumps that have to run continuously, as there is no engine-driven pump on the iS engine.
I haven't noticed the fuel overheating.

Vic
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  #10  
Old 04-28-2018, 01:39 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 628
Default
Quote:
Originally Posted by rv7charlie View Post
This is the primer war of the alt engine crowd (where should the regulator be, and where should the bypassed fuel go). For anyone considering auto style electronic injection, this thread's for you.

Just a minute; I'm going for some popcorn.

;-)
This pump is going in a -7 with a I0-360 with non automotive fuel injection.
__________________
Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring in progress
Donated for 2021 and so should you
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