Murena fuel level sensor

[Lennart Sorth]

(I am posting this on behalf of our new member V46 (who feels ok reading the forum, but not posting yet.)

His message goes:


My Murena's Fuel Level Sensor has rotted away and as you may know neither Carjoy or Simon sell a replacement .

I have found a specialist who may be able to make a replacement . Through the Matra Forum could someone email  me or post some photos of a complete Fuel Level Sensor.
                                                                                           
All I have left of mine is the mounting flange , with the electric connector and the long pipe that goes into the petrol tank. The Quadrant and the arm and float have disappeared !

[Lennart Sorth]

as you may know neither Carjoy or Simon sell a replacement .

no - I did't actually know! - drat! - my sensor IS in the tank, but the potentiometer has been poor for ages, and I "fixed" it a few decades ago by bending the needle a bit to run over a different part of the potentiometer windings, with the result that it reads quite a lot too low.  I recently attempted repairing it, as it was close to falling apart, but it still reads too low.

/Lennart

[Grapes]

There's also something wrong with my fuel sensor since it left me with an empty tank while still saying it was plenty full (I was already wondering why it seemed to take forever to drop).

I hope it's something easy but just in case it isn't I've just looked if there was an alternative and apparently there's such a thing as ultrasonic fuel sensors that you can just hook up to an Arduino or Raspberry Pi and which should probably give you the option to check the fuel level on your phone.
I don't however know if this is something that would work on the fuel tank in the Murena.

If so that could be an option. Possibly it's even possible to hook it up to the original gauge on the dashboard?

-update-
It was something easy. It was just stuck at the top and a bit of a wriggle dislodged it and it's working fine again. Lucky me

[roy4matra]

as you may know neither Carjoy or Simon sell a replacement .

no - I did't actually know! - drat! - my sensor IS in the tank, but the potentiometer has been poor for ages, and I "fixed" it a few decades ago by bending the needle a bit to run over a different part of the potentiometer windings, with the result that it reads quite a lot too low.  I recently attempted repairing it, as it was close to falling apart, but it still reads too low.

/Lennart

It appears a number of owners have not been downloading or checking my technical articles, because there has been one on the fuel system, available for quite some time now, and it includes photos and resistance readings if you need to get a repair or another made.  (18:00 7th Aug. update - my updated article wasn't there if anyone checked earlier, but it definitely is there now!)

There is also a module available now that you can set the readings of a different sender to the Murena instrument by setting it up for the empty, quarter full, half full, three quarter full and full positions.  Once that has been done, then it will read correctly throughout the range.  Its called the Gauge Wizard 4 from Spiyda.  Check out www.spiyda.com or phone 07859 106329 (U.K. mobile)

Roy