The best way to Install Fuel Flow Transducer 201b in Aircraft?

This appears frequently enough and then we made a decision to produce about how exactly easier to install the fuel flow transducer model 201B produced by J.P. Instruments inside an aircraft.

Orientation in the 201B fuel flow transducer:

To start and presuming you’ve removed the current flow transducer, endure the completely new 201B flow transducer in the horizontal position while using three wires up – as this is just how it’s to get fitted. Fitting the flow transducer almost every other way can lead to its failure. When the fuel flow is within the horizontal position, the rotor you will find proper oriented and aligned with fuel flow. This is one way it’s supposed to function. Also, while fitting it, make certain that there are no bend closer than 6 inches both in the inlet or outlet pipe i.e. no bends after or prior to the transducer. Also, avoid using aluminium or brass fittings when installing the 201B flow transducer – just use AN816-7 Steel. The transducer is engineered to shut tight so avoid using Teflon tape, or other thread sealant compound of any type. Also, the transducer is marked Inside and out for your fuel lines – so be sure that you attach it correctly or perhaps the rotor will malfunction. The most torque should not exceed 15 feet lb (180 lbs.) or roughly, two full turns past hands tight.

Installation location:

In situation your aircraft features a carburettor, the fuel flow should ideally attend the identical height since the carburettor. Whether it’s greater, fit an anti-siphon loop inside the line that peaks greater when compared with transducer. In situation your aircraft sports a power injected engine, fit the fuel flow involving the engine fuel pump as well as the servo regulator. In situation your aircraft has that unique vapor return line, install the fuel flow transducer involving the servo regulator as well as the flow divider (spider).

We percieve aircraft with Fuel Flow mounted involving the electric boost pump as well as the mechanical pump – this is not recommended. Also, don’t hard mount the transducer for the engine as engine vibration can break the internal rotor or allow it to be malfunction and supply misleading results. When installing the 201B fuel flow transducer, the wires ought to be connected to the EDM. The flow transducer can get its power (12V) in the EDM. Also, the wires should not be route along with or alongside ignition wires, alternator wires, spark plug leads, or cabin heater ignition wires.

When done, set the K-factor. The Transducer 201B possess a K-factor of ~29.


It might be helpful and to procure a Flow Tester (just $35.00) for testing instrument and transducer.

Fault finding:

Some pilots referred to as straight into report consistently high fuel flow readings. For individuals who’ve adopted above installation procedure correctly, search for air entering system at selector valve (may require an alteration in the O-ring). This is a test: The next time the aircraft is traveled in cruise, turn on the boost pump for starters minute. Once the fuel flow drops, then it becomes an indication that air is dripping to the fuel line upstream in the transducer. It is possible that air is dripping to the system using the seal valve or other connection. Fuel stain may not be visible.