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brucebell74(at)sbcglobal.
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 Posted: Wed Jun 30, 2010 5:45 am Post subject: Use of Fuel Boost Pump |
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Hi All,
I turn on the fuel boost pump for all take offs and landings. Since I spend
most of my time in the traffic pattern the fuel boost pump is on most of the
time. I have lunch on Mondays with The RV Bunch and brought up the use of
the fuel boost pump. Three (RV-10, RV-9A and RV-7A) said they only use it to
start! So what do the rest of you do who have fuel injected engines? I have
92 hours and 332 landings in the log book. Thanks, Bruce Bell
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ollie6a(at)embarqmail.com
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| Posted: Wed Jun 30, 2010 6:06 am Post subject: Use of Fuel Boost Pump |
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I always turn on the fuel pump for take-off as the fuel press is very low without it. The eng performs the same when I have forgot it but I like that little more insurance. Hardly ever turn on for landing.Ollie 6A carb.
On Wed, Jun 30, 2010 at 9:32 AM, Bruce B. Bell <brucebell74(at)sbcglobal.net (brucebell74(at)sbcglobal.net)> wrote:
| Quote: | --> RV-List message posted by: "Bruce B. Bell" <brucebell74(at)sbcglobal.net (brucebell74(at)sbcglobal.net)>
Hi All,
I turn on the fuel boost pump for all take offs and landings. Since I spend most of my time in the traffic pattern the fuel boost pump is on most of the time. I have lunch on Mondays with The RV Bunch and brought up the use of the fuel boost pump. Three (RV-10, RV-9A and RV-7A) said they only use it to start! So what do the rest of you do who have fuel injected engines? I have 92 hours and 332 landings in the log book. Thanks, Bruce Bell
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From Central Florida,
Ollie
[quote][b]
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Wed Jun 30, 2010 6:07 am Post subject: Use of Fuel Boost Pump |
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Lycoming fuel injection is different from Continental. Most low wing
aircraft with Lycoming(Bendix) fuel injection call for boost pump on for
takeoff and landing. TCM engines mixture is affected by boost on or
off, so they either use low boost or none for takeoff. Bendix fuel
injection is much less sensitive to input pressure, so the only downside
to using the boost pump is wear and tear on the boost pump.
The reason for the boost pump is in case the engine driven pump fails.
Whether you are confident that you could realize fuel was the problem
when the engine quit and switch the pump on before you impact is the
main issue. If you establish a routine to turn the pump off as soon as
you reach 1000AGL, you will minimize wear and tear on the boost pump.
Personally, I tend to think it is less critical for landing, but an
argument can be made either way.
On 6/30/2010 6:32 AM, Bruce B. Bell wrote:
| Quote: |
<brucebell74(at)sbcglobal.net>
Hi All,
I turn on the fuel boost pump for all take offs and landings. Since I
spend most of my time in the traffic pattern the fuel boost pump is on
most of the time. I have lunch on Mondays with The RV Bunch and
brought up the use of the fuel boost pump. Three (RV-10, RV-9A and
RV-7A) said they only use it to start! So what do the rest of you do
who have fuel injected engines? I have 92 hours and 332 landings in
the log book. Thanks, Bruce Bell
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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martinaerodrome(at)gmail.
Guest
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| Posted: Wed Jun 30, 2010 7:54 am Post subject: Use of Fuel Boost Pump |
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Bruce,
I suggest Don Rivera (at) Air Flow Performance. I have one of his boost pumps with good history. His pumps are designed for both boost and continous operation. When I built my RV8 ten plus years ago, I questioned him about your concern. His comments are that the boost pumps are designed for intermittant or continous operation. Also a side note, his pumps and fuel injections systems are preferred by most of the Indy racers. Do not hesitate to call him, he always has been very helpful.
Dick Martin
RV8 N233M
the fast one
On Wed, Jun 30, 2010 at 8:32 AM, Bruce B. Bell <brucebell74(at)sbcglobal.net (brucebell74(at)sbcglobal.net)> wrote:
[quote]--> RV-List message posted by: "Bruce B. Bell" <brucebell74(at)sbcglobal.net (brucebell74(at)sbcglobal.net)>
Hi All,
I turn on the fuel boost pump for all take offs and landings. Since I spend most of my time in the traffic pattern the fuel boost pump is on most of the time. I have lunch on Mondays with The RV Bunch and brought up the use of the fuel boost pump. Three (RV-10, RV-9A and RV-7A) said they only use it to start! So what do the rest of you do who have fuel injected engines? I have 92 hours and 332 landings in the log book. Thanks, Bruce Bell
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Matt Dralle, List Admin.
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robin(at)PaintTheWeb.com
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| Posted: Wed Jun 30, 2010 8:50 am Post subject: Use of Fuel Boost Pump |
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I would rather replace a boost pump than an airframe so I keep the boost
pump on during all near ground operations take off & landings plus fuel
tank changes at low altitude. There is no down side IMHO. If for some
reason you have a fuel problem down low and your boost pump is not on you
can turn it on and hope for a restart but when you have so little space
between you and the third planet from the sun you should be focusing your
attention to the best place to safely land. Keep using the boost pump you
may live long enough to wear it out.
Robin
Do Not Archive
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dan.pat.b(at)gmail.com
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| Posted: Wed Jun 30, 2010 11:55 am Post subject: Use of Fuel Boost Pump |
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BRUCE:I ONLY USE THE FUEL BOOST PUMP WHEN STARTING THE ENGINE TO BRING THE FP UP TO 20+ PSI BEFORE ENGAGING THE STARTER; OTHERWISE - I DON'T USE IT. AN OLD TIMER ADVISED THAT THIS WAS THE WAY TO GO. BE INTERESTING TO KNOW WHAT OTHER'S MIGHT BE DOING WITH THE BOOST PUMP.
DAN
RV-7A - N307TB
154 HOURS SINCE FIRST
FLIGHT ON 08/04/09
On Wed, Jun 30, 2010 at 9:32 AM, Bruce B. Bell <brucebell74(at)sbcglobal.net (brucebell74(at)sbcglobal.net)> wrote:
[quote]--> RV-List message posted by: "Bruce B. Bell" <brucebell74(at)sbcglobal.net (brucebell74(at)sbcglobal.net)>
Hi All,
I turn on the fuel boost pump for all take offs and landings. Since I spend most of my time in the traffic pattern the fuel boost pump is on most of the time. I have lunch on Mondays with The RV Bunch and brought up the use of the fuel boost pump. Three (RV-10, RV-9A and RV-7A) said they only use it to start! So what do the rest of you do who have fuel injected engines? I have 92 hours and 332 landings in the log book. Thanks, Bruce Bell
===========
get="_blank">http://www.matronics.com/Navigator?RV-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
[b]
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rhdudley1(at)bellsouth.ne
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| Posted: Wed Jun 30, 2010 12:55 pm Post subject: Use of Fuel Boost Pump |
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Hi Dan,
My procedure has been (in 2 235 Cherokees and my RV -6A): ON for startup fuel pressure, OFF for taxi and runup, ON for takeoff, approach or anything below 1000 feet, ON when changing tanks and ON as an emergency procedure at any hint of engine misbehavior. My rationale for OFF for taxi and rumup is confirmation of engine driven fuel pump operation; ON for takeoff, approach or anything low level as backup of the engine driven fuel pump; ON at any engine hiccup in case it resulted from an engine driven fuel pump failure.
An experience that reinforced those procedures was a failed engine driven pump on a 235 Cherokee after takeoff and at about 1000 feet when I turned off the boost pump and the engine started to run down until I turned the boost pump back on.
Regards,
Rich Dudley
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tcervin(at)embarqmail.com
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| Posted: Wed Jun 30, 2010 3:03 pm Post subject: Use of Fuel Boost Pump |
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I never use my boost pump unless just befor starting and only if it's set for more than 10 days. RV6-A 360-A1A and never had an issue.
Tom in Ohio
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Gary.A.Sobek
Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA
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| Posted: Wed Jun 30, 2010 3:08 pm Post subject: Use of Fuel Boost Pump |
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Bruce:
I use Boost Pump to start, takeoff, climb, switch fuel tanks, anytime at or below 1,000 AGL, landing, and anytime taxiing in HOT weather with a HOT engine.
Lycoming recommends can be found on the web in the Lycoming Flyer Key Reprints.
See:
http://www.lycoming.textron.com/support/tips-advice/key-reprints/pdfs/Key%20Operations.pdf (page 19 in the PDF document or page 53 as Lycoming numbers it)
From the Lycoming Flyer link above:
Use of Fuel Boost Pumps with Lycoming Engines
As an engine manufacturer, we are frequently asked about the proper use of the fuel boost pump with our power plants. Although we can’t pretend to be an expert on the fuel boost pump itself, we have some positive recommendations concerning its use with our engines. Where a boost pump is provided by the airframe manufacturer, and the airframe Pilot’s Operating Handbook has a limited treatment of the use of the fuel boost pump, perhaps this discussion can provide the necessary fuel boost pump information for the pilot in order to operate his or her engine as safely as possible.
It is necessary to supply the engine with a steady, uninterrupted flow of fuel for all operating conditions. Entrapped air, temperature changes, pressure drops, agitation in the fuel lines and other factors affect the release of air and vapor from the fuel system. Under some circumstances where an engine-mounted fuel pump is provided, it may not be able to pump a continuous fuel supply free of excessive vapor.
An effective continuous fuel supply is provided by use of the fuel boost pump. As a general recommendation, the fuel boost pump should be used with Lycoming engines in all conditions where there is any possibility of excessive vapor formation, or when a temporary cessation of fuel flow would introduce undesirable hazards. The conditions under which Lycoming recommends operation of the fuel boost pump are as follows:
1. Every takeoff.
2. Climb after takeoff unless Pilot’s Operating Handbook says it is not necessary.
3. When switching fuel selectors from one separate fuel tank to another, the fuel boost pump should be “on” in the new tank until the operator is assured there will be no interruption of the fuel flow.
4. Every landing approach.
5. Any time the fuel pressure is fluctuating, and the engine is affected by the fluctuation.
6. Hot weather, hot engine ground operation where fuel vapor problems cause erratic engine operation.
7. Some General Aviation aircraft require the use of the fuel boost pump during high-altitude flight. This will be spelled out in the Pilot’s Operating Handbook.
8. If the engine-mounted fuel pump fails.
If the fuel boost pump is used during ground operation, don’t fail to check the condition of the engine-mounted fuel pump before takeoff by turning the boost pump off briefly, and then back “on” for takeoff. If the engine-mounted pump has failed, it would be safer to know that on the ground rather than in the air when the fuel boost pump is turned “off.”
When in doubt, do the safest thing and use the fuel boost pump with Lycoming engines. Don’t be “stingy” with the boost pump. In most cases, they last the overhaul life of the engine, and are then exchanged or overhauled themselves. AS A REMINDER, the airframe Pilot’s Operating Handbook is the authority if boost pump information is spelled out in it.
A note on how long Van's boost pump for a carb will last: My first boost pump used as listed above lasted more than 10-years and around 2,100 hobbs hours.
Gary A. Sobek
"My Sanity" RV-6 N157GS O-320 Hartzell,
2,381+ Flying Hours So. CA, USA
| Quote: | From: brucebell74(at)sbcglobal.net
To: rv-list(at)matronics.com
Subject: Use of Fuel Boost Pump
Date: Wed, 30 Jun 2010 08:32:07 -0500
--> RV-List message posted by: "Bruce B. Bell" <brucebell74(at)sbcglobal.net>
Hi All,
I turn on the fuel boost pump for all take offs and landings. Since I spend
most of my time in the traffic pattern the fuel boost pump is on most of the
time. I have lunch on Mondays with The RV Bunch and brought up the use of
the fuel boost pump. Three (RV-10, RV-9A and RV-7A) said they only use it to
start! So what do the rest of you do who have fuel injected engines? I have
92 hours and 332 landings in the log book. Thanks, Bruce Bell
|
Hotmail has tools for the New Busy. Search, chat and e-mail from your inbox. Learn more. [quote][b]
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