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701 fuel system

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dpfisher(at)scottsbluff.n
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Posted: Sun Feb 26, 2006 8:34 pm Post subject: 701 fuel system

At 12:58 AM 2/26/2006, you wrote:



 	  Quote: 	
		  Will the engine be sucking air from one tank before the other tank is empty?

The bottom of the gas tank on the 701 is about three and a half feet above

the floor of the cabin. You may empty one tank before the other but both

tanks will be empty before you start sucking air. There may be 8 inches more

fuel on one side than the other when you start sucking air but all of that

fuel will be in the fuel line. How much fuel does 8 inches of fuel line

hold? This is why most high wing Cessnas can operate with the fuel selector

in the both position with no danger of draining one tank before the other.


	


Hi list,



Thanks for a great analysis, Bryan. The only thing I would add is that a 

gravity fed,Cessna style, fuel system should work fine if we fly our planes 

like Cessnas. If we expect to do high speed passes followed by zoom climbs, 

or takeoffs where we stand the plane on its tail, then it might be wise to 

have fuel in both tanks and one or two boost pumps.

I'm now working on the fuel system for my 701 with 80 HP Continental, 

gravity fed, no electric, wing tanks only.  I'm using 3/8 in. lines plumbed 

straight out of the tanks toward the cabin, through  the trim channel above 

the doors, turn 90 degrees forward and down 30 degrees through a hand hold 

/corner brace made of one inch lawn chair tubing then curve down to a tee 

on the top center of the glare shield over the instrument panel. From the 

tee it will go down 30 degrees and forward through a ball type on-off valve 

and on down and a bit to the left to a fitting that goes through the bottom 

of the firewall to the gascolater and then level or up a bit to the carb.

My tanks will each be vented to a tee just inside the lower wing skin. one 

leg of each tee will continue through the lower wing skin to an elbow 

turned 90 degrees forward into the wind.  the other leg points toward the 

other wing and is connected to a cross vent tube along the inside top of 

the windshield so the vent pressure between the tanks can equalize. I'll 

try to avoid anything greater than a 30 degree nose high attitude, and I'll 

test the fuel flow on the ground at all expected flight conditions.  My air 

cooled engine needs air speed to cool so I think it's a good idea to keep 

the climb angles down in any case.  I talked to a guy with an 0200 powered 

701 who had a somewhat similar fuel setup. He also had a boost pump but 

said it wasn't needed.



I've not yet cleared this with Chris.  I'd sure like to hear from anyone 

who has experience with a similar setup.  Comments anyone??



Thanks,



Dave, 701 with A80-8 Continental

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Larry Martin

Joined: 10 Jan 2006
Posts: 31
Location: Cabot, Arkansas

Posted: Mon Feb 27, 2006 6:53 am Post subject: 701 fuel system

There are many ways to plum fuel systems as have been discussed.  I recently 

re-worked mine.  I spent a lot of time exploring the different methods and 

came up with what I consider the best approach for me.  You can find an 

explanation and pictures on my site at www.skyhawg.com/fuelsystem.html.



Larry, N1345L, www.skyhawg.com.

---

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_________________
701 with a Harley, www.skyhawg.com

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