On 4/29/2019 6:34 PM, Mike Sylvester via KRnet wrote:
Hello O-200 Guys. Do I need a fuel pump if I only have a header tank?
Victor Taylor Irvington, Alabama
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I don't have a header tank at all and run 2 electric fuel pumps.
However, here are some things to keep in mind. I'm assuming you're
running a Marvel Schebler carb. If you end up installing a pump make
sure to do the gravity fuel flow test with the pump installed and turned
off. If you do install a pump, make sure it is the very low pressure
type, 3 to 5 pounds. If you have a concern on pump pressure install a
fuel pressure regulator and set to 3 1/2 to 4 pounds. I think the carb
has a limit of around 5 1/2 pounds without modification. I have my
pressure regulator set to 3 1/2 pounds.
You're looking for 150% of fuel burn at full power in the worst case
situation, low fuel, nose high. The 0-200 manual claims about 8 gph at
2750 rpm so shoot for 12 gph fuel flow in the test. Test for six
minutes and multiply by 10 to make it easy. If you can't get that with
gravity it may require it be mandatory to run pump on t.o. and landing
and other unusual attitudes. Some simple test with tell you what's
required.
Larry Flesner
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