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Fuel Pump Vent/Drain Line Routing

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Paul M 383

Joined: 19 Mar 2012
Posts: 97
Location: United Kingdom

Posted: Thu Jan 16, 2020 10:05 am Post subject: Fuel Pump Vent/Drain Line Routing

How have others routed a drain line from the replacement Corona mechanical pump? (SB-912-063UL free replacement). This is on a 912 ULS and standard XS Cowl & FWF.



I used Tygon tube and found what I thought was a route avoiding heat sources etc - turned out not to be, when the tube caught fire after a ground run... this stuff is aviation grade: fuel, oil & acid but not fire-proof!



What have others done in their install please? Ideally send photos, or a clear description please.



Thanks in advance!



Paul M



XS Mono 912S

G-PLPM, waiting for Permit

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Last edited by Paul M 383 on Fri Jan 17, 2020 2:11 am; edited 1 time in total

peterz(at)zutrasoft.com
Guest

Posted: Thu Jan 16, 2020 10:25 am Post subject: Fuel Pump Vent/Drain Line Routing

Hi Paul,

Lucky you - yours was free 

On my classic cowl, after looking it over and seeing hot stuff everywhere between the pump and the rear of the cowl,  I decided to pop a hole in the cowl below the pump and redux in a small tube stub, sanded flush with the exterior.  I then run silicone hose between the pump and the tube.  On the classic I figure any fuel from a blown diaphragm will stream rearward along the outside of the cowl, hopefully missing the hot bits - that's the theory anyway lol

Cheers,

Pete

On Thu, Jan 16, 2020 at 1:14 PM Paul M 383 <europaul383(at)hotmail.com (europaul383(at)hotmail.com)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "Paul M 383" <europaul383(at)hotmail.com (europaul383(at)hotmail.com)>

 

 How have others routed a drain line from the replacement Corona mechanical pump? (SB-912-063UL free replacement). This is on a 912 ULS and standard XS Cowl & FWF.

 

 I used Tygon tube and found what I thought was a route avoiding heat sources etc - turned out not to be, when the tube caught fire after a ground run.. this stuff is aviation grade: fuel, acid but not fire-proof!

 

 What have others done in their install please? Ideally send photos, or a clear description please.

 

 Thanks in advance!

 

 Paul M

 

 XS Mono 912S

 G-PLPM, waiting for Permit

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=494307#494307

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/corona_pump_1_729.jpg

 http://forums.matronics.com//files/corona_pump_2_121.jpg

 

 

 

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peterz(at)zutrasoft.com
Guest

Posted: Thu Jan 16, 2020 10:27 am Post subject: Fuel Pump Vent/Drain Line Routing

oh, and for the classic owners out there, I also had to take my right side radiator to a local tig welder and have him angle the inboard outlet away from the new pump outlets, which were an interference fit against the rad hose.

cheers



On Thu, Jan 16, 2020 at 1:14 PM Paul M 383 <europaul383(at)hotmail.com (europaul383(at)hotmail.com)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "Paul M 383" <europaul383(at)hotmail.com (europaul383(at)hotmail.com)>

 

 How have others routed a drain line from the replacement Corona mechanical pump? (SB-912-063UL free replacement). This is on a 912 ULS and standard XS Cowl & FWF.

 

 I used Tygon tube and found what I thought was a route avoiding heat sources etc - turned out not to be, when the tube caught fire after a ground run.. this stuff is aviation grade: fuel, acid but not fire-proof!

 

 What have others done in their install please? Ideally send photos, or a clear description please.

 

 Thanks in advance!

 

 Paul M

 

 XS Mono 912S

 G-PLPM, waiting for Permit

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=494307#494307

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/corona_pump_1_729.jpg

 http://forums.matronics.com//files/corona_pump_2_121.jpg

 

 

 

 ===========

 br> fts!)

 r> > rel="noreferrer" target="_blank">http://www.matronics.com/contribution

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 ===========

 pa-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Europa-List

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 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

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Burrilla

Joined: 25 Apr 2015
Posts: 185

Posted: Thu Jan 16, 2020 10:59 am Post subject: Fuel Pump Vent/Drain Line Routing

I took a short piece of flex tube, 6mm fuel tube, and then interfaced with a piece of copper tube, you could use 6mm aluminium, to route past all the hot bits and then along the radiator ducts to rear.

Alan

G-OBJT 	  Quote: 	
		  On 16 Jan 2020, at 18:22, Peter Zutrauen <peterz(at)zutrasoft.com (peterz(at)zutrasoft.com)> wrote:

Hi Paul,



Lucky you - yours was free 



On my classic cowl, after looking it over and seeing hot stuff everywhere between the pump and the rear of the cowl,  I decided to pop a hole in the cowl below the pump and redux in a small tube stub, sanded flush with the exterior.  I then run silicone hose between the pump and the tube.  On the classic I figure any fuel from a blown diaphragm will stream rearward along the outside of the cowl, hopefully missing the hot bits - that's the theory anyway lol



Cheers,

Pete

On Thu, Jan 16, 2020 at 1:14 PM Paul M 383 <europaul383(at)hotmail.com (europaul383(at)hotmail.com)> wrote:

 	  Quote: 	
		  --> Europa-List message posted by: "Paul M 383" <europaul383(at)hotmail.com (europaul383(at)hotmail.com)>  How have others routed a drain line from the replacement Corona mechanical pump? (SB-912-063UL free replacement). This is on a 912 ULS and standard XS Cowl & FWF.  I used Tygon tube and found what I thought was a route avoiding heat sources etc - turned out not to be, when the tube caught fire after a ground run... this stuff is aviation grade: fuel, acid but not fire-proof!  What have others done in their install please? Ideally send photos, or a clear description please.  Thanks in advance!  Paul M  XS Mono 912S G-PLPM, waiting for Permit     Read this topic online here:  http://forums.matronics.com/viewtopic.php?p=494307#494307     Attachments:   http://forums.matronics.com//files/corona_pump_1_729.jpg http://forums.matronics.com//files/corona_pump_2_121.jpg    =========== br> fts!) r> > rel="noreferrer" target="_blank">http://www.matronics.com/contribution           -Matt Dralle, List Admin. =========== pa-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Europa-List ===========  FORUMS - eferrer" target="_blank">http://forums.matronics.com =========== WIKI - errer" target="_blank">http://wiki.matronics.com =========== b Site -           -Matt Dralle, List Admin. rel="noreferrer" target="_blank">http://www.matronics.com/contribution ===========

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Paul M 383

Joined: 19 Mar 2012
Posts: 97
Location: United Kingdom

Posted: Fri Jan 17, 2020 2:40 am Post subject: Re: Fuel Pump Vent/Drain Line Routing

Thanks Pete and Alan,



I was hoping to avoid using solid pipes by finding a cool (!) route, but if I have to...



Pete, watch out for any negative (or positive) pressure at your exit hole - the Rotax Owner video cautions against this very thing:



https://youtu.be/0QYJ3mxziT4?t=859 or

https://www.rotax-owner.com/en/videos-topmenu/free-videos/424-fuelpump



"We do not want to run this line overboard into the slipstream, or into a positive or negative pressure area..."



Best,



Paul

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peterz(at)zutrasoft.com
Guest

Posted: Fri Jan 17, 2020 3:20 am Post subject: Fuel Pump Vent/Drain Line Routing

Thx Paul for the caution.  So far I have not seen any impact to fuel pressure.  I may install a small shield to reduce the pitot pressure.  I fail to see though how pitot pressure could over-ride the fuel pump return spring... just seems to be a bit overblown?  If I do see negative impacts, I will glass in a small tube along the inside of the cowl well away from the exhaust.

On Fri, Jan 17, 2020 at 5:48 AM Paul M 383 <europaul383(at)hotmail.com (europaul383(at)hotmail.com)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "Paul M 383" <europaul383(at)hotmail.com (europaul383(at)hotmail.com)>

 

 Thanks Pete and Alan,

 

 I was hoping to avoid using solid pipes by finding a cool (!) route, but if I have to...

 

 Pete, watch out for any negative (or positive) pressure at your exit hole - the Rotax Owner video cautions against this very thing:

 

 https://youtu.be/0QYJ3mxziT4?t=859 or

 https://www.rotax-owner.com/en/videos-topmenu/free-videos/424-fuelpump

 

 "We do not want to run this line overboard into the slipstream, or into a positive or negative pressure area..."

 

 Best,

 

 Paul

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=494316#494316

 

 

 

 

 

 

 ===========

 br> fts!)

 r> > rel="noreferrer" target="_blank">http://www.matronics.com/contribution

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 eferrer" target="_blank">http://forums.matronics.com

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 ===========

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 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

 ===========

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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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