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07-04-2022, 06:28 PM
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Join Date: Aug 2019
Location: Western Australia
Posts: 1,133
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Fuel line
While you're at it also check the fuel line that leads to the red cube - in the photo it appears as if the bend is kinked and a bit flattened and has a slight dent, possibly from when the line was temporarily removed to insert the test gauge.
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Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, fuselage almost done, working on canopy.
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
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07-05-2022, 08:39 AM
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Join Date: Feb 2022
Location: San Jose
Posts: 27
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Good catch! They pushed the fuel lines apart to make room for the gauge and slightly bent the hose.
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Donated Feb 2022.
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07-05-2022, 08:51 AM
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Join Date: Feb 2005
Location: Oregon
Posts: 1,372
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And while you're down there... maybe it's just the angle of the photo, but it looks like the fuel flow transducer is just hanging in space, supported only by the fuel lines connected to it. If that's the case, I'd worry about something cracking eventually.
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Matt Burch
RV-7 (last 90%)
http://www.rv7blog.com
Any opinions expressed in this message are my own and not those of my employer.
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07-05-2022, 09:45 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,740
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If you are going to rework the red cube, then use the opportunity to move it to a better location. I suggest just after the mechanical fuel pump, using adel clamps to mount it on the engine mount - not the engine.
Follow the normal rules - no right angle fittings, fuel line on the output side running slightly up hill, etc.
Carl
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07-05-2022, 11:21 AM
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Join Date: Feb 2022
Location: San Jose
Posts: 27
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I was told not to put the fuel pressure transducer or the boost pump in the engine compartment due to the heat generated by the exhaust. Is that just hearsay?
Thank you.
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Donated Feb 2022.
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07-05-2022, 11:45 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,740
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Typical install is the boost pump and fuel selector on the cabin side of the firewall. Fuel filter may or may not be.
Fuel flow sender on the engine side of the firewall, between the mechanical fuel pump and the engine. Fuel pressure sender on the firewall, tapped into the output of the mechanical fuel pump.
Carl
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07-05-2022, 12:06 PM
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Join Date: Feb 2022
Location: San Jose
Posts: 27
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Quote:
Originally Posted by Carl Froehlich
Typical install is the boost pump and fuel selector on the cabin side of the firewall. Fuel filter may or may not be.
Fuel flow sender on the engine side of the firewall, between the mechanical fuel pump and the engine. Fuel pressure sender on the firewall, tapped into the output of the mechanical fuel pump.
Carl
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Looks like everything is as you suggested except the fuel pressure sender which should be relocated outside. The boost pump is on the cabin side.
Thank you for spotting that.
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Donated Feb 2022.
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07-05-2022, 01:07 PM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,740
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Quote:
Originally Posted by pv9
Looks like everything is as you suggested except the fuel pressure sender which should be relocated outside. The boost pump is on the cabin side.
Thank you for spotting that.
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Nope - looking at your photo your fuel flow sender (red cube) is on the cabin side of the firewall, not mounted at all - the photo suggest it is suspended just by the fuel lines. That alone is a fuel leak waiting to happen.
Carl
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07-05-2022, 01:49 PM
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Join Date: Feb 2022
Location: San Jose
Posts: 27
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Thank you. The cube was a recent addition by an A&P and I will be sure to relocate it on the other side of the firewall.
I've grounded the aircraft and am going through pretty much everything with a fine tooth comb at this point.
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Donated Feb 2022.
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07-05-2022, 05:22 PM
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Join Date: Jun 2008
Location: San Jose, CA
Posts: 221
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fuel system schematic
Quote:
Originally Posted by pv9
Thank you. The cube was a recent addition by an A&P and I will be sure to relocate it on the other side of the firewall.
I've grounded the aircraft and am going through pretty much everything with a fine tooth comb at this point.
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Sent you a PM with my fuel system schematic for a reference. Your system should be the same since we both have carb'd engines.
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Steve Allison
RV-6A - sloooowwww build
First flight - 3/8/14
Phase II - 5/19/14
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