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Old 01-03-2018, 04:23 PM
dsommers dsommers is offline
Join Date: Jan 2013
Location: Walla Walla WA.
Posts: 21
Default RV 3 Fuel Drain

I have an older RV 3 that I will soon have flying again, the builder only had a fuel sump at the gascolator on the firewall, it has a fuselage tank, is this adequate ? The gascolator is below the tank, just seems to far away from the tank to drain the water out if there is some, what do others have?
Building RV 9A
Bought RV 3
C-150 Sold
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Old 01-03-2018, 04:27 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,481

As long as it is below the tank, should be fine.

Water is heavier than avgas, so that is why you sump at the low point of the system.
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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Old 01-03-2018, 05:13 PM
Larry DeCamp's Avatar
Larry DeCamp Larry DeCamp is offline
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 715
Default Tubing routing ?

Make sure the tubing goes down hill CONTINUOSLY with no low spots to the gascolator.
Larry DeCamp
RV-3B flying w/ carb & Pmags
RV-4 fastback w/ Superior EXP 0360 /AFP & CPI
Clinton, IN
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Old 01-03-2018, 05:17 PM
rv8or rv8or is offline
Join Date: Oct 2007
Location: Norwich England
Posts: 138
Default Fuel Tank Drain

My RV3 has a fuel tank drain as well as a firewall gascolator drain.
I have never had a problem with water but Iím pedantic in keeping the fuel tank full When I know Iím going away and not flying the 3 for a couple of weeks.
If your tank is the same as mine with a flop tube you could get quite a bit of water in the tank before any would would show at the gascolator. But this could also mean whilst flying there is a potential to pick up a lot of water.
When I had my tank repaired I recalibrated my fuel gauge and from empty it took 2 litres of fuel before there was enough fuel for the pump to start pumping.

Points for consideration

Happy flying
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Old 01-03-2018, 07:54 PM
dsommers dsommers is offline
Join Date: Jan 2013
Location: Walla Walla WA.
Posts: 21
Default Fuel Tank Drain

Thanks for all the input, I guess I'll just leave it the way it is, just wanted to make sure it would do the job.
Building RV 9A
Bought RV 3
C-150 Sold
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