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ES Airflow fuel pump questions

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jchang10

Joined: 05 Jul 2006
Posts: 227

Posted: Wed Aug 22, 2007 9:29 pm Post subject: ES Airflow fuel pump questions

I finally received my fuel pump and made the following observations...



1. I had to tweak the bending of the curvy fuel line, because it was 

routing directly over the fuel filter. In its initial configuration, it 

would have made removing the fuel filter extremely difficult, as the 

fuel line would have been directly in the way. I'm assuming this should 

be a regular maintenance item, to remove the filter and clean it. The 

product sheet mentioned doing this after the first 5 to 10 hours after 

initial flight.



This is a picture of someone else's tunnel. forgot to take a picture of 

mine before modifying it:

http://www.jline.com/log/aviation/build/airframe/fuselage/sec37/photos/P1000920.html



This is a picture directly from Van's catalog:

http://www.vansaircraft.com/images/catalog/cat-med_fi-install.jpg



2. As a consequence of #1 above, i removed the AN fitting off of the 

fuel pump at the end of the curvy line. I was surprised to find the

AN fitting's threads to be dry - ie, no fuel lube or paste of any kind.



Should we be double checking these fittings on the fuel pump AN 

fittings? Granted, there are only 2 (each end of curvy line) that i 

would be concerned with. The other fittings all have some kind of white 

paste around their threads.



Anyway, curious what others experience is in this area. Is it just me or 

did anyone else assume this pre-made part is good to go - receive in the 

mail and install. Or am i being too naive on such a critical part?



Jae

#40533

Fuse section 29 thru 38

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_________________
#40533 RV-10
First flight 10/19/2011
Phase 1 Done 11/26/2011

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Thu Aug 23, 2007 10:24 am Post subject: ES Airflow fuel pump questions

Good write up.  As for the fuel lube though, it's not a necessity

to use anything on the fuel fittings.  I'm not saying it's not

a good idea, but it's not a necessity.  I have nothing on any of

my AN fittings for any of my fuel lines.  The seal is made

by the fit of the flare to the fitting.



Tim Olson - RV-10 N104CD - Flying

do not archive

Jae Chang wrote:

 	  Quote: 	
		   

 

 I finally received my fuel pump and made the following observations...

 

 1. I had to tweak the bending of the curvy fuel line, because it was 

 routing directly over the fuel filter. In its initial configuration, it 

 would have made removing the fuel filter extremely difficult, as the 

 fuel line would have been directly in the way. I'm assuming this should 

 be a regular maintenance item, to remove the filter and clean it. The 

 product sheet mentioned doing this after the first 5 to 10 hours after 

 initial flight.

 

 This is a picture of someone else's tunnel. forgot to take a picture of 

 mine before modifying it:

 http://www.jline.com/log/aviation/build/airframe/fuselage/sec37/photos/P1000920.html 

 

 

 This is a picture directly from Van's catalog:

 http://www.vansaircraft.com/images/catalog/cat-med_fi-install.jpg

 

 2. As a consequence of #1 above, i removed the AN fitting off of the 

 fuel pump at the end of the curvy line. I was surprised to find the

 AN fitting's threads to be dry - ie, no fuel lube or paste of any kind.

 

 Should we be double checking these fittings on the fuel pump AN 

 fittings? Granted, there are only 2 (each end of curvy line) that i 

 would be concerned with. The other fittings all have some kind of white 

 paste around their threads.

 

 Anyway, curious what others experience is in this area. Is it just me or 

 did anyone else assume this pre-made part is good to go - receive in the 

 mail and install. Or am i being too naive on such a critical part?

 

 Jae

 #40533

 Fuse section 29 thru 38

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jesse(at)saintaviation.co
Guest

Posted: Thu Aug 23, 2007 10:51 am Post subject: ES Airflow fuel pump questions

Are you talking about all of the fuel fittings, or just the flare fittings?

There are pipe threads in the fuel system.  Did you use the fuel lube on

them?  Just for clarification.



Do not archive



Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

www.saintaviation.com

Cell: 352-427-0285

Fax: 815-377-3694



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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Thu Aug 23, 2007 11:15 am Post subject: ES Airflow fuel pump questions

Ahhhh, awesome catch.  Yes, I'm only talking flare fittings.

As far as the pipe thread fittings, I did use sealant on those

and I would suggest people do.  One interesting thing though...

on the fuel spider and injectors, they don't use any sealant

at all...at least at aerosport.  That I thought was strange,

but I guess not.



So yes:

NPT = sealant (but not necessarily on ALL NPT fittings)

Flare = Nothing needed



Is that what you found too?



Tim Olson - RV-10 N104CD - Flying

do not archive

Jesse Saint wrote:

[quote] 

 

 Are you talking about all of the fuel fittings, or just the flare fittings?

 There are pipe threads in the fuel system.  Did you use the fuel lube on

 them?  Just for clarification.

 

 Do not archive

 

 Jesse Saint

 Saint Aviation, Inc.

 jesse(at)saintaviation.com

 www.saintaviation.com

 Cell: 352-427-0285

 Fax: 815-377-3694

 

 --

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jchang10

Joined: 05 Jul 2006
Posts: 227

Posted: Thu Aug 23, 2007 12:13 pm Post subject: ES Airflow fuel pump questions

Thanks Tim, that does make sense. That will save me a lot of grief 

trying to work with sticky stuff around the fuel selector and such. I 

guess i took Van's instructions to use fuel lube too literally.



Sticking with the fuel pump, does anyone have or know of a primer on how 

this fuel pump works? I am not quite clear why fuel would travel around 

in circles like this. Any diagrams for what is inside of the manifold?



Jae

 	  Quote: 	
		  >

> 

>

> Good write up.  As for the fuel lube though, it's not a necessity

> to use anything on the fuel fittings.  I'm not saying it's not

> a good idea, but it's not a necessity.  I have nothing on any of

> my AN fittings for any of my fuel lines.  The seal is made

> by the fit of the flare to the fitting.

>

> Tim Olson - RV-10 N104CD - Flying

> do not archive

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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:

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_________________
#40533 RV-10
First flight 10/19/2011
Phase 1 Done 11/26/2011

BPA(at)bpaengines.com
Guest

Posted: Thu Aug 23, 2007 12:53 pm Post subject: ES Airflow fuel pump questions

We use a touch of engine oil on the fuel line nuts and injector nozzles.

It's real easy to clog an injector and engine oil is fuel soluble. NPT

fittings receive a bit of Loctite antiseize, but only on the threads and

we take care not to over apply. Brass fittings flake, and aluminum on

aluminum with out anything galls.



.02 spent



Allen Barrett

BPE, Inc 



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