Fuel flow meter to 0 when auxiliary pump is on

Stephen Shore

Pre-takeoff checklist
Joined
Sep 30, 2017
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422
Location
Longview, TX
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sshore
Beech Sundowner with Lycoming O-360.

Fuel flow meter reads perfectly - steady with no fluctuations - when on the engine mechanical fuel pump. If the auxiliary fuel pump is turn on, the flow meter immediately goes to 0. Fuel pressure reading is unaffected.

Electric fuel pump is located upstream of the fuel flow transducer.

Any ideas?
 
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