Picasso petrol fuel gauge oddities

[silent.planet]

Hi all,

Very recently had my 04 Citroen Picasso 1.8 converted - BRC Sequent fitted at Gas4Cars in Milton Keynes.
Since then, the petrol fuel gauge has behaved very oddly, dropping a couple of bars in a few miles. Then after stopping and restarting, jumping back up to half a tank. Makes it difficult to know how much I actually have in the tank.

Is this because it is trying to account for the apparent lack of petrol consumption and is trying to recalibrate itself?

Also, does anyone know how accurate the real-time mpg display is likely to be compared to petrol - (it's not *that* accurate even then) - but is it likely to be in the right ball park and out of interest, what and how is it measuring?

Any opinions or insight welcomed!

Thanks

[silent.planet]

From the www dot citroen-owners-club dot co dot uk web site

Operation stages : When the ignition is switched on . The instrument panel compares the last fuel level displayed with the gross level indicated by the fuel sender unit (variable resistor fitted with a float) . If there is a significant difference (about 10 litres), the gross level information is displayed, otherwise the last fuel level displayed remains .
Operation stages : When driving . The fuel sender unit is no longer used . The engine management ECU supplies the fuel flow information to the BSI . The BSI encodes this information in a VAN frame . The instrument panel takes this consumption information into account to calculate the fuel level . The instrument panel sends this level to the BSI via the VAN network . Special cases : Low fuel warning . Below a certain sender unit value, the instrument panel sends the minimum fuel information to the BSI via the VAN in addition to the fuel level in order to warn the engine management ECU . In addition, the instrument panel displays the warning message : "LOW FUEL WARNING" . The warning lamp is illuminated .

<BR>
My main concerns were that petrol was being consumed somehow in addition to LPG, and that I would not know if no petrol was in the tank, but it seems that the low fuel condition is treated as a special case thankfully