Fuel flow sensor location
My Flowscan sensor was originally mounted downstream from the mechanical pump, adjacent to the #4 exhaust. This bothered me as it seemed to be a fire hazard. Additionally the engine ran roughly for several minutes after a hot start. Therefore I moved the sensor to the aft baffle bulkhead inside the plenum above cylinder#3. The fuel from the fuel injection servo going to the distribution spider passes through the sensor. The sensor is wrapped in firesleeve insulation material. It was necessary to use 90 degree fitting at both the inlet and the outlet. However, I have found the accuracy to be excellent: typically .2 gallons error in a 30 gallon flight, or 0.67% error. The error is the same as it was in the original location. The post-hot start roughness still exists, but it now clears within thirty seconds. The Flowscan unit seems unaffected by the 90degree fitting.
2021 VAF dues paid with thanks
Navy A7E Vietnam era
Ret. Corporate Pilot: Gulfstream, IA Jet, Jetstar, Falcon 10, 20, 50, HS125