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  #1  
Old 03-05-2012, 01:10 PM
ao.frog ao.frog is offline
 
Join Date: Sep 2006
Location: Manstad, Norway
Posts: 866
Default What is this port on the spider for?

I'm wondering what the open port on the pics below is for? (Lyc IO-360)
It's marked "GAGE" so maybe it's for a fuel-pressure gage?

I'm using the fuel pressure sensor on the firewall according to the drawings, so no need for a gage port here.
If so, I guess I can just blank it out? (I have a suitable fitting)

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Regards Alf Olav Frog / Norway
First RV-7 completed, (bought partly finished from a US-builder) 305 hrs per July 2014, SOLD
Second -7 had first flight Feb 25th 2014. 220 hrs pr July 2019. Life is good!
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  #2  
Old 03-05-2012, 01:15 PM
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rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,763
Default

Its for a fuel flow gauge that uses metered fuel pressure to indicate fuel flow. You can safely plug this port.
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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  #3  
Old 03-05-2012, 04:57 PM
penguin penguin is offline
 
Join Date: Jan 2005
Location: England
Posts: 1,118
Default

The benefit from using this port for the fuel pressure is that it shows when fuel starts to flow into the cylinders - so when priming its the best indication of when fuel actually starts to flow. It will also show the pressure of fuel delivered (which varies with throttle position). No pressure here means no fuel in the cylinders.

It can be plugged, but I think this is a more useful pressure indication than just after the fuel pump.

Pete
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  #4  
Old 03-05-2012, 08:04 PM
chaskuss chaskuss is offline
 
Join Date: Mar 2005
Location: SE Florida
Posts: 1,510
Default Service Port

Alf,
That fitting is a service test port. It is used to take a pressure reading, like your car mechanic would do to check the fuel pressure of your car's engine. You could remove the fitting and plug it. The PROPER thing to do, is to cap it with an AN929 cap. See

http://www.aircraftspruce.com/catalog/hapages/an929.php

The fuel distributor sees less pressure than what is seen at the fuel pump. The FI servo modifies [lowers] the pressure to the fuel distributor. Checking pressure here is done by a mechanic who is trying to diagnose a fuel injection problem.

Charlie
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  #5  
Old 03-06-2012, 08:14 AM
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rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,763
Default

Quote:
Originally Posted by chaskuss View Post
Alf,
That fitting is a service test port.
Charlie
Never heard it called a "test port" but most older airframes that have a combination manifold pressure/fuel flow instrument use this for the fuel flow side.
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Please don't PM me! Email only!

Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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  #6  
Old 03-06-2012, 03:20 PM
twisted-wrench twisted-wrench is offline
 
Join Date: May 2008
Location: Eagles Nest, T56
Posts: 68
Default I got caught by this also

The somewhat interesting thing is that on the spyder under the fitting it says Guage. I missed that when I was asking questions.
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  #7  
Old 03-06-2012, 03:49 PM
ao.frog ao.frog is offline
 
Join Date: Sep 2006
Location: Manstad, Norway
Posts: 866
Default Thanks...

... for the replies guys.

I'll plug this port then and then build on.
__________________
Regards Alf Olav Frog / Norway
First RV-7 completed, (bought partly finished from a US-builder) 305 hrs per July 2014, SOLD
Second -7 had first flight Feb 25th 2014. 220 hrs pr July 2019. Life is good!
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