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Curt.Thompson(at)verizon.
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 Posted: Tue Sep 09, 2008 9:02 am Post subject: Re - Question about fuel flow from only one tank? |
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Jeff,
If the problem is due to slight differences in vents then why would some be
able to duplicate this with ground tests?
I'll try to attach a page from a 1981 C152 POH. Note that there is a vent
line between the two tanks. This might be hard to do in a CH701 as the
fuselage dips between the wings and I don't think you would want that vent
line to have a dip and fill with fuel. Also note that the exterior vent
line is on the left tank and the left tank has a sealed cap. The right tank
has no exterior vent line but has a vented cap. It also looks like there is
an ON/OFF valve (no LEFT/RIGHT/BOTH/OFF).
I've never flown a C152. Does anyone know if the C152 has this problem?
Curt
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randy(at)rjhebertassoc.co
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| Posted: Tue Sep 09, 2008 9:23 am Post subject: Re - Question about fuel flow from only one tank? |
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Curt
My 152 had the same problem
I didn't have it long enough though to get into the problem.
My CFI told me "... that always happens with this airplane.."
I bought it from the FBO. It was a trainer that they were selling.
I had only flown it a few times in training and a few times as the
owner.
Had to sell it but I know it was a common problem.
Randall J Hebert
Randall J Hebert & Associates, Inc
Consulting Engineers
Ph 337-261-1976 Fx 337-261-1977
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randy(at)rjhebertassoc.co
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| Posted: Tue Sep 09, 2008 9:31 am Post subject: Re - Question about fuel flow from only one tank? |
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A 172 has a Left/Both/Right valve
A 152 has On/Off so it always feeds from both
Randall J Hebert
Randall J Hebert & Associates, Inc
Consulting Engineers
Ph 337-261-1976 Fx 337-261-1977
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dougsnash
Joined: 14 Apr 2008
Posts: 281
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| Posted: Tue Sep 09, 2008 6:05 pm Post subject: Re - Question about fuel flow from only one tank? |
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The C-152 can drain one tank first just like we have been discussing here. I experienced this on my Solo cross country. I expected to have 6 gallons of fuel left when I landed, I did not expect it all to be in one wing. I don't know if it would have quit if the low tank had run dry but I was getting a little concerned.
Doug MacDonald
CH-701 Scratch Builder
NW Ontario Canada
DO Not Archive
--- On Tue, 9/9/08, Curt Thompson <Curt.Thompson(at)verizon.net> wrote:
| Quote: | From: Curt Thompson <Curt.Thompson(at)verizon.net>
Subject: RE: Re: Re - Question about fuel flow from only one tank?
To: zenith701801-list(at)matronics.com
Date: Tuesday, September 9, 2008, 11:57 AM
Jeff,
If the problem is due to slight differences in vents then
why would some be
able to duplicate this with ground tests?
I'll try to attach a page from a 1981 C152 POH. Note
that there is a vent
line between the two tanks. This might be hard to do in a
CH701 as the
fuselage dips between the wings and I don't think you
would want that vent
line to have a dip and fill with fuel. Also note that the
exterior vent
line is on the left tank and the left tank has a sealed
cap. The right tank
has no exterior vent line but has a vented cap. It also
looks like there is
an ON/OFF valve (no LEFT/RIGHT/BOTH/OFF).
I've never flown a C152. Does anyone know if the C152
has this problem?
Curt
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Wed Sep 10, 2008 1:06 am Post subject: Re: Re - Question about fuel flow from only one tank? |
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The C150 vent has a very specific location and orientation to work correctly. It is also permissible to have vented caps on both tanks.
I normally switch fuel depending on what passenger loading is, if solo drain from left side first and use both for landings anytime the tank is less than 1/4. I have had the engine temporarily shutdown when flying on a 1/4 or less tank if the nose is down or flying unbalanced rudder.
Only incident I had with uneven fuel in the 701 was when after flying 3/4 hr from full tanks, I noted the left gauge reading 1/4 and the right gauge reading full. Had a moment to think about this, if i had a fuel leak in the left then thats the one to switch to before all that fuel is gone. however, from what i could see of the trailing edges of the ailerons, there seemed to be droplets of something on the right wing. I switched to feeding off the right side, upon landing found a rather large hole where the filler cap should be. Seems that starting flight with full tanks can start a suction that continues to siphon all the fuel across from the good tank to keep the other one full. I have now chained the caps so I cannot leave them sitting on the slat gap. Also dont let others around to chat while refueling. Yes I got the cap back, glad the vent was painted yellow so I could see it waiting for me back at the threshold on the grass runway!
Ralph
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Ralph - CH701 / 2200a |
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