DaveHadfield
Member
We have an 1999 RV6a which I didn't build, an O-320 A3B, and a stock fuel installation as far as I can tell.
The cockpit side walls and the rear side of the firewall have stick-on thermal insulation, so it's a little difficult to follow the lines.
Anyway, there appears to be a 1/4" line returning from the engine-driven fuel pump, through the firewall, along the left side of the cockpit just under the instrument panel. Is this a fuel-return line? A vent for the fuel pump?
I ask because it has a valve in the line. 3 positions. The rearward position drops the fuel pressure to zero very quickly, yet IT IS NOT the main fuel feed to the gascolator.
The system works fine with the valve in the tranverse position [see photo].
The top of the photo is forward.
And during a recent flight the engine ran fine with the valve in the forward position, but after shutdown it burped half a cup of gas onto the ground from the left main tank vent.
Is this familiar to anyone?
Thanks,
Dave
The cockpit side walls and the rear side of the firewall have stick-on thermal insulation, so it's a little difficult to follow the lines.
Anyway, there appears to be a 1/4" line returning from the engine-driven fuel pump, through the firewall, along the left side of the cockpit just under the instrument panel. Is this a fuel-return line? A vent for the fuel pump?
I ask because it has a valve in the line. 3 positions. The rearward position drops the fuel pressure to zero very quickly, yet IT IS NOT the main fuel feed to the gascolator.
The system works fine with the valve in the tranverse position [see photo].
The top of the photo is forward.
And during a recent flight the engine ran fine with the valve in the forward position, but after shutdown it burped half a cup of gas onto the ground from the left main tank vent.
Is this familiar to anyone?
Thanks,
Dave
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