[NSRCA-discussion] Tee in fuel line for OS140 ?

[verne at twmi.rr.com]

Kelly,
You can accomplish the same thing with 2 lines, 2 tees, 2 dots, and 1 
check valve (I use the YS check valve). 

The first fuel dot goes to the first tee. From that tee, one line goes 
to the tank clunk and the other line goes to the inlet on the fuel 
pump. When fueling thru this first dot, the fuel will follow the path 
of least resistance and go into your tank.

The second fuel dot goes to the second tee. From that tee, one line 
goes to the tank vent and the other line goes to the check valve. The 
check valve must be oriented so it allows air into the tank.

All fuel pumped into the tank must go thru the first dot as described 
above and the second dot must be un-capped to vent the tank while 
fueling. When it's full, fuel overflow will come out of the second dot. 
The check valve won't allow fuel to pass through it in that direction 
so none of the overflow will come out there.

I'd suggest drawing this out on paper so you can "see" what I'm 
describing. Once you do, it'll all make sense.

I've used this system in two Smaragds with OS 140's and it works great. 
One plus is that you don't get any raw fuel coming out of the vent line 
because the check valve will only let air in but nothing out. The only 
caution is that you need to uncap the second fuel dot if the plane is 
fueled and just sitting around between flights when it's hot outside. 
Since the check valve won't let air out, the fuel expanding from the 
heat will build up pressure in the tank and the engine will flood. I 
leave my vent side fuel dot un-capped until it's time to start the 
engine to avoid the problem. 

The system works great and limits the fuel mess on your plane.

Hope this helps.

Verne

----- Original Message -----
From: twtaylor <twtaylor at ftc-i.net>
Date: Wednesday, November 15, 2006 6:52 am
Subject: Re: [NSRCA-discussion] Tee in fuel line for OS140 ?
To: 'NSRCA Mailing List' <nsrca-discussion at lists.nsrca.org>

> I've been using the 3 line method for years. One line to a YS 
> check valve
> for vent and two fuel dots and have never flooded the engine. 
> Works slick
> last long time.
> 
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of 
> Kelly Regan
> Sent: Tuesday, November 14, 2006 8:08 PM
> To: NSRCA-discussion at lists.nsrca.org
> Subject: [NSRCA-discussion] Tee in fuel line for OS140 ?
> 
> Another question,
> 
> The fuel tank/line setup in the OS140 manual shows the clunk fuel line
> running outside of the plane connected with a short length of fuel 
> tubeand then run back into the plane to the engine/pump.  The 
> short tube is
> removed  for fueling.
> 
> The instructions indicate that I would need to pinch off the fuel line
> going to the engine/pump if another system is used. 
> 
> I would like to do 3 lines with 2 fuel dots, one vented, or 2 lines
> with a tee fitting on the clunk line.
> 
> Can I do this without having to pinch off the line to the engine/pump
> each time I fuel up ?
> 
> Thank you for the help.
> 
> -- 
> ______________________________________________
> 
> Kelly Regan
> www.reganbrothers.com
> Home Page: http://mysite.verizon.net/vze6uror/
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