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Technically, as long as there is no fuel flow the pressure at one end is the same as at the other end. However, once fuel begins to flow there is friction between the fuel and the tube wall, minute restrictions at fittings, bends, etc, so that there is theoretically a small drop in pressure due to these (and other ) effects. But, with a 3/8" diameter line over that distance, the pressure drop is probably too small to even measure with your gauge.
So, the short answer is the pressure is essentially the same at both ends.
Ed
----- Original Message ----- From: "Yvon Cournoyer" <geryvon@videotron.ca>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, July 17, 2007 5:14 PM
Subject: [FlyRotary] FUEL SYSTEM PRESSURE
One question which is bothering me concerning pressure in my fuel system. The distance between the inline fuel pump and the throttle body where the pressure regulator is located is about 16 feet. The pressure sender is located about 6 feet before the pressure regulator. The fuel lines are 3/8 inch inside diameter throughout. The fuel is gravity fed about 11or 12 inches to the fuel pump which pushes it to the fuel regulator and throttle body, activating the pressure sender on the way.. Is the fuel pressure the same at the pump outlet, the sender and the regulator? Yvon.
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