Fuel return on 0-360 RV-7

I am doing some work on an RV7 with an O-360 Lycoming on it. I find it unusual that there is a 1/4 inch fuel return line from the manifold where you install the FP sensor running down the inside of the firewall and I suspect it "T"s into the main fuel line between the selector.

I think it will cause problems with the FP readings and think I should remove it.
Any advise please?

Carburator Temp

I have a second question - does someone have a picture of where to install the carb temp sensor from Dynon please?

Happy Thanks Giving for you all in the USA.

Done some further research and decided to take out the fuel return plumbing and fittings.

Still hoping someone will help me with a picture of where to install the carb temp sensor.

I don't have a picture but there is a threaded fitting on the front side of the carb, very close to where it bolts to the sump, that the temperature probe screws into.

Janekom said:

I am doing some work on an RV7 with an O-360 Lycoming on it. I find it unusual that there is a 1/4 inch fuel return line from the manifold where you install the FP sensor running down the inside of the firewall and I suspect it "T"s into the main fuel line between the selector.

I think it will cause problems with the FP readings and think I should remove it.
Any advise please?

Click to expand...

I encourage you to research the use of the fuel return line before removing. I installed one on the RV-6 I am building. It allows for fuel flow in heat soaked conditions to avoid vapor lock and other fuel vapor related issues. Mine has a valve in the cockpit and it will only flow during startup and Taxi in heat soak or high ambient conditions. I also have a .040" orifice in the circuit to limit flow in case the valve is left open.

Larry

Thank you

Thank you guys!
I saw the small screw and thought it might be that.

On the return line - WILLCO.

Report back

Well I have now done the best research I could have done - I hope. Phoned a number of owners including the best known RV owner and builder (in my opinion) in SA and again looked at the plans.

The news I that this fuel return came out yesterday and the fuel system restored as per Vans plans for the reasons mentioned earlier.

In summary again - a return to a point between the fuel selector and Facet pump is not really a return. Secondly you will never get good FP readings this way.

I plumbed a return on my carb setup (back to tank) controlled by a primer valve. Hot starts in the heat of Texas leave the fuel system vulnerable to vapor lock, worked perfect.
I switched over to AFP FI and now use thier purge valve.