2.13 Install the P-300C Fuel Level Probes:
Install the P-300C (Capacitive) Fuel Level Probes in accordance with the aircraft manufacturer’s instructions.
2.14 Install the P-300M Magnetic Fuel Level Sender:
The MVP system can interface with an aircraft’s existing resistive fuel sensors via the RFLM-4 or these resistive
fuel level sensors can be replaced with the P-300M (Magnetic Float) Fuel Level Sender. The signal produced by the
P-300M Sender is a linear voltage output designed to work with the MVP system.
The P-300M’s float arm and travel must match the aircraft’s existing sender’s arm and travel. Due to the lack
of information from aircraft manufacturers, the existing sender
may need to be removed from the aircraft and sent to Electronics
International. This way, the P-300M’s float arm and travel can be
matched with the aircraft’s existing sender. Contact Electronics
International for further information.
The P-300M has the same bolt pattern as resistive fuel senders.
The P-300M requires three wires to interface to the EDC (resistive
senders only use one wire).
Note: Calibrating the MVP system to a fuel tank can compensate
for nonlinearity in the tank’s shape and nonlinearity in the resistive
fuel level sensor. The MVP cannot correct for inconsistent or non-repeatable signals from resistive fuel level senders.
Unfortunately, many older resistive fuel level senders (and in some cases, newer resistive senders) exhibit some of the
following problems:
- Variation in the wiper-to-element resistance (CRV).
- Stick slip problems with bearings and wiper-to-element contact.
- Windup causing jumps in readings.
- Weak wiper tension.
- Loose or worn bearings, causing fluctuations in readings.
- Worn out wiper.
- Corroded wiper.
- Corroded or worn element.
- Build up of varnish on the wiper and element.
- Water logged floats.
If you find inconsistent or inaccurate fuel level readings (due to a defective resistive fuel level sender), you must have
the sender replaced. Inaccurate readings can lead to a dangerous situation. The MVP depends on the fuel level sender
for accurate fuel level information. Read the “Important Notice” in the MVP Operating Instructions.
The P-300M is a float type fuel level sender that uses a magnet and pickup device to detect the float position and
produce an accurate signal for the MVP system. The P-300M has no wiper or resistive element and there is no tension
on the bearings. It is not subject to the numerous problems associated with resistive type senders. The P-300M has
nothing to wear out or affect inaccurate fuel level readings. Also, the P-300M does not require electricity to flow
through an element and wiper saturated in fuel.
3-Wire Cable
18
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