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george.mueller(at)aurora.
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 Posted: Mon Sep 08, 2008 7:16 am Post subject: Zenith701801-List Digest: 18 Msgs - 09/07/08 |
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Regarding the question about unequal draining of the fuel tanks, I have a fuel system setup that I am very happy with and I think adds extra safety. My tanks equalize when standing so the levels are the same, and during flight they empty at the same rate. When I refuel, I always add about the same amount to each tank to top off the tanks.
I start with both tanks connected to each other with two tees on that line (behind the pilots backrest). One tee goes down to a facet electric fuel pump. The other tee goes down to an andair check valve. The output from the facet pump goes to the zenith gascolator and the output from the check valve goes to the other input on the zenith gascolator. From the gascolator forward it is per plans with a fuel shutoff in the cockpit.
I did fuel flow tests with this setup. First I clamped off the line with the facet pump, and got good fuel flow through the line with the check valve. This simulated a fuel pump clog (although when off the facet pumps allow fuel to flow through). Then I clamped off the line with the check valve to simulate a clog or failure of the check valve and got good fuel flow. (The check valve is there to prevent the fuel pump from pumping fuel up through that redundant fuel line back to the tanks). With both lines open and fuel pump running I got a faster fuel flow (I measured gallons per hour for all of these variations but I don't recall what they were now).
The backup electric pump offers redundancy in case of a failure of the mechanical pump, and helps to avoid vapor lock ( I have never had any trouble with starting hot this summer). My procedure is, when starting, to pressurize the fuel system with the electric fuel pump, then shut it off. I then start the engine. This insures that the mechanical pump is working. After the engine is running I turn on the electric pump and leave it running. I have a fuel pressure gauge in the cockpit to monitor fuel pressure.
George in Milwaukee
N701GM 45 hours flying
[quote][b]
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ch701builder
Joined: 07 Feb 2006
Posts: 119
Location: N38.9947,W105.1305,ALT. 9,100'
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| Posted: Mon Sep 08, 2008 8:35 am Post subject: Zenith701801-List Digest: 18 Msgs - 09/07/08 |
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George,
Could you post a drawing or pictures of this setup. Also, what engine are you using?
Thanks,
Keith
CH701 -- scratch
N 38.9940
W 105.1305
Alt. 9,100'
***************************************************************************************
george.mueller(at)aurora.org (george.mueller(at)aurora.org) wrote:
| Quote: |
Regarding the question about unequal draining of the fuel tanks, I have a fuel system setup that I am very happy with and I think adds extra safety. My tanks equalize when standing so the levels are the same, and during flight they empty at the same rate. When I refuel, I always add about the same amount to each tank to top off the tanks.
I start with both tanks connected to each other with two tees on that line (behind the pilots backrest). One tee goes down to a facet electric fuel pump. The other tee goes down to an andair check valve. The output from the facet pump goes to the zenith gascolator and the output from the check valve goes to the other input on the zenith gascolator. From the gascolator forward it is per plans with a fuel shutoff in the cockpit.
I did fuel flow tests with this setup. First I clamped off the line with the facet pump, and got good fuel flow through the line with the check valve. This simulated a fuel pump clog (although when off the facet pumps allow fuel to flow through). Then I clamped off the line with the check valve to simulate a clog or failure of the check valve and got good fuel flow. (The check valve is there to prevent the fuel pump from pumping fuel up through that redundant fuel line back to the tanks). With both lines open and fuel pump running I got a faster fuel flow (I measured gallons per hour for all of these variations but I don't recall what they were now).
The backup electric pump offers redundancy in case of a failure of the mechanical pump, and helps to avoid vapor lock ( I have never had any trouble with starting hot this summer). My procedure is, when starting, to pressurize the fuel system with the electric fuel pump, then shut it off. I then start the engine. This insures that the mechanical pump is working. After the engine is running I turn on the electric pump and leave it running. I have a fuel pressure gauge in the cockpit to monitor fuel pressure.
George in Milwaukee
N701GM 45 hours flying
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ist">http://www.matronics.com/Navigator?Zenith701801-List
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ITT Industries
Advanced Engineering & Sciences
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keith.ashcraft(at)itt.com (keith.ashcraft(at)itt.com)
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[quote][b]
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Mark Colbeck
Joined: 04 Nov 2007
Posts: 29
Location: Cochrane, Alberta, Canada
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| Posted: Wed Sep 10, 2008 4:53 am Post subject: Re: Zenith701801-List Digest: 18 Msgs - 09/07/08 |
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George I too would be very interested in seeing the pictures or drawings. I am at that stage.
Thanks
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