MacCool
Well Known Member
edit: Sorry...the title is misleading. I meant to type that the gauge-displayed Fuel Pressure fluctuates when the engine is hot....
Background: RV-9A with IO-320 D1A. Fuel flow read from a Red Cube (new) driving an EMS part of an Advanced Flight 5400 EFIS. Red Cube mounted on firewall next to a Weldon 8163A boost pump. Engine driven pump is a Tempest, and was replaced about 70 hours ago.
Issue: When the engine is hot, I often get low fuel pressure when running on the engine-driven fuel pump while taxiing or on approach with manifold pressure at about 15 inches. No stuttering or anything from the engine, just low fuel pressure at the very bottom of the green arc according to the EFIS fuel pressure gauge. Doesn't do this during flight, nor when the engine is not heat-soaked. Works fine in cold weather and first flight of the day.
Trying to decide if this is a problem. The engine performs well otherwise. When I first picked up the plane, the engine-driven fuel pump went out...noted when the engine kept dying while taxiing. Replaced the original Lycoming engine-driven pump with a Tempest at that time. That was about 70 tach hours ago.
Any thoughts...?
Background: RV-9A with IO-320 D1A. Fuel flow read from a Red Cube (new) driving an EMS part of an Advanced Flight 5400 EFIS. Red Cube mounted on firewall next to a Weldon 8163A boost pump. Engine driven pump is a Tempest, and was replaced about 70 hours ago.
Issue: When the engine is hot, I often get low fuel pressure when running on the engine-driven fuel pump while taxiing or on approach with manifold pressure at about 15 inches. No stuttering or anything from the engine, just low fuel pressure at the very bottom of the green arc according to the EFIS fuel pressure gauge. Doesn't do this during flight, nor when the engine is not heat-soaked. Works fine in cold weather and first flight of the day.
Trying to decide if this is a problem. The engine performs well otherwise. When I first picked up the plane, the engine-driven fuel pump went out...noted when the engine kept dying while taxiing. Replaced the original Lycoming engine-driven pump with a Tempest at that time. That was about 70 tach hours ago.
Any thoughts...?
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