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EnaudZ(at)aol.com
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 Posted: Fri Jun 23, 2006 8:58 am Post subject: Fuel Pressure Ghosts |
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cHECK FOR FUEL RESTRICTION IN TANK
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by0ung(at)brigham.net
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| Posted: Sun Jun 25, 2006 7:32 am Post subject: Fuel Pressure Ghosts |
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Ok I have been thinking about this thread and this is what I have come up with…..
If you want to be able to test the fuel system for restrictions in the engine driven or elect or both pumps… strainers in the bottom of the tank etc…... disconnect the hose from the outlet of the pump or pumps if ran in series. And install a new one that will reach the floor a clear hose would be nice in helping to see what is happening. It would be real easy if using an electric pump…. Just turn it on and let fuel run into a fuel can sitting on the floor. Then turn the pump off and see if the fuel continues to pass through the hose… it should continue to siphon out if the fuel can on the floor is lower than the one in the plane. Next, time how long it takes to siphon out a gallon of gas… if it will keep up with your fuel burn while siphoning it should surely keep up with 1 or both pumps running. If you don’t have an elect pump you should be able to get the gas flowing by turning the prop over by hand, make sure the hose remains out of the prop disk. Or I suppose you could , if using a clear hose, just suck on it. If the siphoning speed wont keep up with your engine fuel burn,,, you might want to investigate where the restrictions might be. Make sure you get all the air out of the line while making this test as an air bubble will partially or totally restrict the flow. If while running this test there is a steady line of air bubbles…it may indicate a leak in the fuel delivery system.
Ok a bit more technical… the difference in pressure in fuel levels is just under ½ psi per foot…. So if the level of gas in the plane is 3 ft higher than the end of the siphon hose… there should be just under 1 ½ psi difference in the levels…. So that would tell you what kind of fuel flow you would have through the system at that pressure… assuming that all the components were laid out on a flat bench.
Any questions feel free to respond on or off list.
Do archive.
Boyd
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