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  #11  
Old 06-03-2014, 12:44 PM
tailcreek_flyer tailcreek_flyer is offline
 
Join Date: Oct 2008
Location: Stettler Alberta
Posts: 58
Default Low Point Drain

[quote=Bevan;885426]At least one fuel injection manufacturer requires a fuel filter either immediately before or after the mechanical fuel pump. That could be FWF on a RV.

During the pre-cover inspection of my RV9A, my MDRA inspector brought up the following issue with my fuel system:
All went well with the exception of the lack of a drain on the section
of fuel line that runs between the High Pressure Boost pump (fuel
injection style) and the gascolator on the firewall. This section of
line runs parallel with the brake lines on the cabin floor. The
inspector pointed out that this section of line represents the lowest
point in the fuel system and could accumulate water. He felt that I
should elevate the fuel line to the same elevation as the discharge of
the Boost Pump (Fuel Injection Boost Pump, not facet style) and run
this line at this elevation to the cabin side of the gascolator,
therefore making the gascolator the low point drain,
OR
Install a "TEE" fitting with ?" branch on the section of line in
question and use this branch with a quick drain fitting as my low
point drain.

I sent this info off to Vans support and received the following response:
We regard the tank drains as the low point in the system. So far as we know, it hasn't been necessary under any licensing authority to add more drains, or raise the fuel lines in the fuselage. I'm sure there are plenty of RV- 9As flying in Canada without any mods like that, and I would be cautious about modifying a proven system which has worked well in practice.
Vans

I have added a gascolator as it is required in Canada. I have added a drain fitting to the gascolator and can drain it without removing the cowling.
I am wondering how this will pan out during my upcoming final inspection next month.
Cam Andres C-FTLL
RV9A with IO360
Almost there..
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  #12  
Old 06-03-2014, 11:33 PM
ron sterba ron sterba is offline
 
Join Date: May 2007
Location: salem Oregon
Posts: 1,023
Default

GENTLEMAN! I Am ahhh-ed at the educational line of thinking. Each time a post came up it opened a avenue of either or possibilities of events! I couldn't have posted a thought because each one held its own validity. I can only say that by the time these posts conclude it should be archived in VANSAIRFORCE library. I look at HOW you installed a system and then articulate the WHY! You builders are amazing! In a day or two I will post again as I enjoy the comradery. Thanks so much for the thought process to help me make the right decision. I'll print these posts for a folder for ALL ITS OWN. These are as I see it a MUST HAVE for for any builder of any plane.

Much appreciated guys! Gals too!

Ron in Oregon
N421HJ RV9A

Last edited by ron sterba : 06-04-2014 at 06:03 PM.
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  #13  
Old 06-04-2014, 01:16 PM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,674
Default

Cam

I completely disagree with adding the Tee and/or raising the fuel line. Water could accumulate in a fuel tank where there is a large volume of stagnant fuel and/or air (condensation). However, I do not see how water will accumulate in a fuel line where the fuel is usually flowing and contains no air. Especially for such a short section of fuel line as this. If this was the case, you would need a tee for "each" section of "low" fuel line. It just isn't going to happen. It's going to get pumped through the line quicker than it can accumulate.

I slug of water may get picked up from the tank (assuming it wasn't completely sumped prior to engine start) and pumped through the lines. Some of that water may get trapped in the gascolator. But it also might just get pumped through. Are you using a fuel return type system or purge valve?

Let us know how your final inspection goes. I'm not too far behind you.

Bevan
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Located in western Canada

Last edited by Bevan : 06-04-2014 at 01:20 PM. Reason: added info
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  #14  
Old 08-09-2014, 12:33 PM
Closterman's Avatar
Closterman Closterman is offline
 
Join Date: Nov 2008
Location: La Sarre, Qu?bec, Canada
Posts: 90
Default Lower point

My MD-RA inspector juste leave my shop half an hour ago and tell me the same thing than Tailcreek_flyer. We want a drain valve between the fuel selector valve and the boost pump (I will have a carb engine). It's not very complexe to put a valve here, but all thing added are something more who can fail... I will have the gascolator with a drain on it. Tailcreek_flyer, please report us the result of your final inspection !
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Piper Cherokee C-FEYI (sold)
RV-7A C-GMYL Status : FLYING with perpetual RV Grin!!!
RV-9A Status : Tail & Wing 90% Fuselage: 10%
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Last edited by Closterman : 08-09-2014 at 12:46 PM.
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