Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Auxillary fuel pump

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Zenith-List
View previous topic :: View next topic  
Author Message
phd1993



Joined: 04 Apr 2006
Posts: 18
Location: Overland Park, KS
PostPosted: Wed Dec 06, 2006 12:15 pm    Post subject: Auxillary fuel pump Reply with quote
Looking for information concerning need for an auxiliary fuel pump for a CH701 with Rotax 912S engine. Previous flight experience has been basically limited to a low-wing Piper Cherokee 140 which had an auxiliary electric fuel pump that was turned on at several times during a flight - like prior to starting the engine, take-off, landing, and any thing else you did where you really did not want to starve the engine of fuel.

I have both main and auxiliary fuel tanks installed so the fuel system will either feed from main tanks (both sides) or auxiliary tanks (both sides) hopefully bypassing the potential problem of making turns with the fuel selector pointing to the lowered wing.

If it is desirable (needed?) to have an auxiliary electric fuel pump I would like to solicit information of what pump, sender, and gauge would be appropriate.

Thanks in advance,

Sam Hutcheson
CH701
N6412Z (reserved)
[quote][b]

- The Matronics Zenith-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List
Back to top
View user's profile Send private message
David X



Joined: 10 Jan 2006
Posts: 154
Location: Princeton, NJ, USA
PostPosted: Wed Dec 06, 2006 8:41 pm    Post subject: Re: Auxillary fuel pump Reply with quote
I would recommend an aux fuel pump, even in a high-wing such as the 701. There is no guarantee that the fuel will continue by gravity-feed if the main mechanical pump fails. You need an alternate route for the fuel if the main pump goes.

The Facet pumps are quite economical, reliable and easy to replace when they go bad. I split the fuel line after the sump, one line goes to the mechanical fuel pump, one to the electric aux pump. The output of both pumps join together before splitting again to the two carbs. The pressure gauge and transducer that comes with the Rotax Engine is adequate.

http://www.aircraftspruce.com/catalog/eppages/facetpumps.php

- The Matronics Zenith-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

_________________
Zodiac 601 XL - CZAW Built - Rotax 912S
DO NOT ARCHIVE
Back to top
View user's profile Send private message Send e-mail
4rcsimmons(at)comcast.net
Guest
PostPosted: Thu Dec 07, 2006 5:20 am    Post subject: Auxillary fuel pump Reply with quote
List,

After all of the comments about Aux. fuel pumps and placment, one gentlmen remnminded me that presurizing the gascolator may not tbe the best of ideas.

Think out the fuel systems and compare them to Certifified aircraft.
Then, live with your decisions.

--
Thanks,
Rich Simmons
[quote][b]

- The Matronics Zenith-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List
Back to top
David X



Joined: 10 Jan 2006
Posts: 154
Location: Princeton, NJ, USA
PostPosted: Thu Dec 07, 2006 5:30 pm    Post subject: Re: Auxillary fuel pump Reply with quote
4rcsimmons(at)comcast.net wrote:
that presurizing the gascolator may not tbe the best of ideas


Agreed. Better to place the aux fuel pump after the sump.

Also not a good idea to feed all fuel through the aux pump, even if it has a pass-thru capability ... because they have been known to malfunction.

The output from the fuel selector should go to the sump, then the line splits after the sump to go to the inputs of the two fuel pumps. It's unavoidable to rejoin the outputs of the two pumps prior to feeding the carb(s).

- The Matronics Zenith-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

_________________
Zodiac 601 XL - CZAW Built - Rotax 912S
DO NOT ARCHIVE
Back to top
View user's profile Send private message Send e-mail
amyvega2005(at)earthlink.
Guest
PostPosted: Fri Dec 08, 2006 9:32 am    Post subject: Auxillary fuel pump Reply with quote
to all:

I have been giving the question of accurate fuel burn some thought. Fuel senders have allways been and are notorious for not giving accurate readings. And some are concerned about tanks draining without pilots noticing (highly unlikely). One solution I have found is to place a fuel flow sensor between engine driven fuel pump and carborator. It is a really easy task, just cut the hose between the two and place the sensor. Fire coat it allong with the rest of the furel line, then run the wires to the EIS. Taadaa! Placing a fuel flow sensor close to the carb allows me to measure fuel rate/hour and fuel remaing by telling the computer how many gallons in the tanks and or using simple math to tell me whats left. Down side is that for the over paranoid, it won't tell you if there is a leak. Only way to get around that is to keep the fuel guage in place and if they look lower than what the fuel flow says there should be, you then have detected the lease. ex: just took off
for one hour with full 30 gallons. Fuel flow meter says I am burning 5.5/hour. Tank guages say I now have 1/2 tanks? something is up.

What is nice about a fuel flow sensor is that we all know tank guages are not that accurate, so now you have a second source of info coming in and can cross refernce. Good luck.

--

- The Matronics Zenith-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Zenith-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group