Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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 Posted: Mon Jun 25, 2012 8:42 am Post subject: Engine out..deadstick landing required..question on header |
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Really doesn't matter whether 582 or 912. They broth run mechanical fuel pumps, albeit powered differently. The header tank height only becomes relevant when fuel level drops below the level of the engine, i.e. the wing tanks are empty. Then head pressure will reduce, even to negative, as the fuel level drops below the level of the engine. The 582 pump handles this fine, (tested on several occasions, both on the ground and in the air, yikes!) I even did the test where you empty the wing tanks, jack the mains up 12", and run full power for 20 minutes. Worked fine with my system.
There are, of course, a zillion possibilities, almost all rehashed in the archives, from bad fuel system design to the notoriously cloggy "glass" filters frequently found between wing and header tanks. (Personal experience with these.) Got to start at one end and go to the other, starting at clogged cap vents, working through clogged finger strainers due to flaking Kreem, on to swelling lines due to auto fuel, noting any line loops that might vapor lock, checking filters for flow, checking the header tank vent line for vapor locked line loops and closure, any broken valves, and finally the fuel pump itself. Is it weak? Do you have the heavy duty wall thickness pulse line? Is the pulse line too long?
Time to spend some quality time with his aircraft.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 500 hrs. and grounded
Now a glider pilot, too.
On 6/25/2012 6:27 AM, kitfoxjunky(at)decisionlabs.com (kitfoxjunky(at)decisionlabs.com) wrote: [quote]I was looking at the fuel system, and I noted that the header tank is mounted on the tube structure near the back of the seat. It is a plastic tank, and looks to me like the bottom is almost at the floor level. In my KFIV I do not run a 582..I have a 912s, but the header tank is mounted high up behind the baggage area.
Is a header tank not supposed to provide a head of fuel to the engine? How could it do that if it was mounted below the level of the carbs?
Wanted to ask those out there more in the know on the two stroke setups. [b]
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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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