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  #11  
Old 01-20-2014, 12:44 PM
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MarkW MarkW is offline
 
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The very common Precision Silverhawk or Bendix does not require a return.
I believe the ECI and EFII both require a return.
I think Airflow builds two models for that engine, one with and one without. I went with the Precision partially for that reason and so far am happy with that decision.
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  #12  
Old 01-21-2014, 09:44 AM
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Mark33 Mark33 is offline
 
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Quote:
Originally Posted by JanRV6UK View Post
Simple question I could probably find if doing a search ....

Which FI system does not require a return line to the tank ... and what are the downside ?? I need to be thinking about a engine purchase ... 360 with a CS prop .. I have not fitted a return line fitting to the tanks .. Yes at this point in time I could pull the tank off the wings and install one .. but doing it in the section furthest away from the suction strainer will require a access hole cut in the rear. ... and I do not fancy all that extra piping in the cabin (RV6) ... Appreciate some thoughts on this ...
The EFII system does require a return line, but there's not any diffiult plumbing required in relation to the fuel tank. The following is from the EFII web site along with a link to that page which shows pictures of the installation.

"Fuel return line installation.
Electronic fuel injection fuel systems include a full return fuel system which feeds 20 to 30 gallons per hour through the engine fuel rail at all times. The engine uses what it needs out of this supply and the unused fuel is returned to the selected fuel tank. Below, you can see the installation of the fuel return into the fuel tank. Note - it is not necessary to disturb the original tank access panel which supports the fuel feed line and fuel level sender. A new 2.5" cover panel supporting the -6 return fuel bulkhead fitting is fabricated and sealed to the tank with pro-seal."

http://flyefii.com/customer_projects...v8a/duggan.htm
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