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  #141  
Old 05-03-2021, 01:16 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,377
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Quote:
Originally Posted by seagull View Post
Was it a simple replacement, was it easily accessible?
It took about 3 hours start to finish. I had to drain four gallons of fuel.
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 650

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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  #142  
Old 05-03-2021, 09:59 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,026
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I hate climbing back into the baggage compartment for annual when I inspect the pump. Iíve found that tossing a couple of bean bag chairs into the cockpit after I pull out the seats reduces the aches and pains from the flap handle and everything else that would be poking me.
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  #143  
Old 05-06-2021, 02:47 PM
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Piper J3 Piper J3 is offline
 
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I flew 1.2 this morning to test the new 40135 Facet electric fuel pump. Looks like 5 psig fuel pressure in cruise flight which is about a 1 psig gain. There might be an improvement in fuel pressure during full-throttle climb. OAT was 48F Ė I used engine preheat before flight because airplane was cold-soaked. Not a whole lot else to report. Next post will be when weather gets 80+F.
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 650

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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  #144  
Old 05-06-2021, 10:07 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
Posts: 3,026
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80F! Jim, thatís balmy in PHX! All kidding aside I havenít experienced vapor lock symptoms below the upper 90s.

Rich
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  #145  
Old 05-10-2021, 04:47 PM
rtlongdon rtlongdon is offline
 
Join Date: Jul 2020
Location: Stanwood, WA
Posts: 11
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Hi all,

Interesting thread. I am getting back into aviation after 20 years and I'm considering an RV12. Admittedly my brain is having to "warm up" to the idea of Rotax engines since I am coming from Lycs, Continentals, round engines and turbines. In general I like what I see and I really appreciate forums like this to help myself and others learn from experiences that we'd rather not have ourselves! I've flown several gliders and I don't have a glider rating. It's exciting at best.

Seagull made and interesting point in post #69 regarding the fact that the only lines in the system that don't experience return fuel circulation are the feed lines from the tree to the carbs.

Prepare to experience my ignorance, but I'm an engineer so most of my ideas don't work ! Would it be possible to install a "T" at each carburetor inlet and allow fuel to bypass and return from that point thus circulating fuel through the feed lines as well?

More of a thought experiment than anything else. I don't have any real experience messing with Rotax engines.

Kind regards to all!
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Sticking toe back in water after 20 years

Last edited by rtlongdon : 05-10-2021 at 04:50 PM. Reason: grammar correction
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  #146  
Old 05-11-2021, 06:49 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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Russ,

My understanding of the fuel system is that you are not just reducing fuel line temperature with recirc flow, we rely on boost pump discharge pressure too in order to prevent vapor lock. Adding another bypass flow path might drop the boost pump discharge pressure and promote vapor lock.

Rich
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  #147  
Old 05-12-2021, 02:01 AM
rtlongdon rtlongdon is offline
 
Join Date: Jul 2020
Location: Stanwood, WA
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Rich,

Good point. I looked at the pressure vs flow graph for the Facet Cube pump, and at 5 PSI, it can maintain about 8 GPH so one would have to control the return flow rate through any additional lines to keep things in the proper range.
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