Matronics Email Lists :: View topic - Teflon hose for inverted fuel pickup?

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Teflon hose for inverted fuel pickup?

Matronics Email Lists Forum Index -> RV-List

View previous topic :: View next topic

Author Message

khorton01(at)rogers.com
Guest

Posted: Thu Mar 02, 2006 3:25 pm Post subject: Teflon hose for inverted fuel pickup?

I'm wondering about replacing my inverted fuel pickup hose with a  

Teflon one (e.g. Aeroquip 666) when I open that tank up for  

inspection.  The regular hoses should be replaced every once in a  

while, which will be a lot more difficult if the hose is secured to  

the elbow.  A Teflon hose is supposedly good forever, if it is  

protected from damage, like inside a fuel tank.  That way I could put  

it in and essentially forget about it.  I would probably open the  

tank up for a look every few years, but hopefully would never need to  

replace anything.



I have no experience with Teflon lined hoses.  I have several questions.



1. Is a Teflon hose as "floppy" as a regular hose?  A too-stiff  

inverted fuel pickup is no good.



2. I don't recall what the floppy end of the hose looks like.  Does  

it have a standard hose end fitting that the weighted pickup screws  

to, or is it something custom?



3. Can I install the hose ends myself, or would I need to order a  

custom hose?  I would have expected Van to carry this as an option,  

but they don't seem to.



4. Does anyone sell a ready-made Teflon hose that is just the right  

length for an inverted fuel pickup on an RV-8, or would I need to  

measure and order a custom one?



5. Is there any reason other than cost that I shouldn't use a Teflon  

hose?



6. It is important to get the right length.  I've never figured out  

how the hose length is specified.  The descriptions I have read talk  

about measuring between mating surfaces.  But the mated surfaces are  

at a 37 degree angle.  What do I measure to?  Where can I find a  

drawing or clear explanation?



Thanks,



Fly safe,



Kevin Horton         RV-8 (finishing kit)

Ottawa, Canada

http://www.kilohotel.com/rv8



do not archive

- The Matronics RV-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?RV-List

LessDragProd(at)aol.com
Guest

Posted: Thu Mar 02, 2006 5:25 pm Post subject: Teflon hose for inverted fuel pickup?

Hi Kevin,

 

I just installed Teflon hoses in my RV-4+ fuel tanks.  The Teflon  hose is 

slightly stiffer than the regular hose I had purchased from Van's.   Since my 

tanks aren't installed yet, I was able to observe the flop tube  assembly moving 

around in different tank positions.  Looked good.

 

It's my understanding that Teflon is the only hose material that can be  

expected to last when immersed in fuel.  The other fuel hose materials  

deteriorate over time when fully immersed.

 

The symptoms of a deteriorated flop tube hose are the same as having the  

flop tube fall off the attach fitting.  The sides of the hose become porous  and 

suck air as soon as the fuel level goes down far enough to expose the  sides 

of the flop tube.  Perhaps at the 3 1/2 gallon level?  (I  helped fix a 

Starduster that had this problem.)

 

There is a flare tube fitting on both ends of Van's hose with a flare tube  

to NPT adapter to attach the flop weight.

I made my Teflon hoses with a flare tube fitting at one end and a NPT  

fitting at the other end, so I could attach it directly to the flop tube  weight.  

This made the hose section slightly longer to get back a little  flexibility.

 

I did have to make the hose assembly a 1/4" shorter than standard to  clear 

the internal fitting for my flush quick drain fitting.  RV-4's are a  pain to 

build, compared to the QB's, but it is a little easier to make those  little 

nonstructural changes.  

 

Regards,

Jim Ayers

 

In a message dated 03/02/2006 3:28:17 PM Pacific Standard Time,  

khorton01(at)rogers.com writes:






I'm wondering about replacing my inverted  fuel pickup hose with a  

Teflon one (e.g. Aeroquip 666) when I open  that tank up for  

inspection.  The regular hoses should be  replaced every once in a  

while, which will be a lot more difficult  if the hose is secured to  

the elbow.  A Teflon hose is  supposedly good forever, if it is  

protected from damage, like inside  a fuel tank.  That way I could put  

it in and essentially forget  about it.  I would probably open the  

tank up for a look every  few years, but hopefully would never need to  

replace  anything.



I have no experience with Teflon lined hoses.  I have  several questions.



1. Is a Teflon hose as "floppy" as a regular  hose?  A too-stiff  

inverted fuel pickup is no good.



2. I  don't recall what the floppy end of the hose looks like.  Does   

it have a standard hose end fitting that the weighted pickup screws   

to, or is it something custom?



3. Can I install the hose ends  myself, or would I need to order a  

custom hose?  I would have  expected Van to carry this as an option,  

but they don't seem  to.



4. Does anyone sell a ready-made Teflon hose that is just the  right  

length for an inverted fuel pickup on an RV-8, or would I need  to  

measure and order a custom one?



5. Is there any reason  other than cost that I shouldn't use a Teflon  

hose?



6. It is  important to get the right length.  I've never figured out  

how  the hose length is specified.  The descriptions I have read talk   

about measuring between mating surfaces.  But the mated surfaces  are  

at a 37 degree angle.  What do I measure to?  Where  can I find a  

drawing or clear explanation?



Thanks,



Fly  safe,



Kevin Horton         RV-8 (finishing  kit)

Ottawa,  Canada

http://www.kilohotel.com/rv8

- The Matronics RV-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?RV-List

Display posts from previous:

	Matronics Email Lists Forum Index -> RV-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