Reasons to run low boost all the time:

 

Do taxi and run up without low boost to verify the engine driven pump is working.

Low boost for takeoff and climb (in case the engine pump fails when you are close to the ground or too far from the airport)

Low boost is recommended above 10,000’ density alt. to avoid vapor lock. (I found this out the hard way)

In descent, why not leave it running (in case the engine pump fails when you are close to the ground or too far from the airport)

 

Steve Colwell  Legacy IO-550

 

 

Subject: [LML] Re: low boost on take off

andres katz  wrote:

Turn it on on the ground and leave it on for the duration, turn it off to shut the engine down otherwise cutting the mixture won't be enough

Sent from my iPad

On Sep 4, 2013, at 1:44 PM, Shane Bangerter <Shane@rbr3.com> wrote:

What is the best practice for use of low boost fuel pressure pump for the IV-P TSIO 550 E?  Activate on take off or wait to a certain altitude?  I have been flying into Colorado Springs elevation 6,187 with density altitudes over 8,000 this summer and wonder if I should activate the low boost pump while  on the ground.

 

Shane Bangerter

89GG

IV-P

280 hrs