Fuel Gauge Readout Changing When The Battery Gets Reconnected

[gary2009]

Hi all

Went to change the Battery on my is200 this morning with the fuel light on but after i reconnected the new Battery the guage read that i had a quarter of tank of petrol left.Its isnt the first time its done this so i was wondering id there something wrong with my fuel guage at all? i do seem to be getting pretty pants mpg at the min around 19 mpg.Any help would be appreciated.

regards

Gary

[lexdavis]

havin the same sort of problems with the fuel guage on mine reads 1/4 when its empty but when you turn the egnition off it drops to the normal position at the bottom is this a common fault with the 200 my last one didnt do it.

could it be the dash or the sensor in the fuel tank

[gary2009]

Normally happens when people swap engines, as the IS has quite a complicated way of working of fuel levels, and normally comes from an ECU problem (only when swapping engines / upgrading)

Unsure what it could be when you havnt changed anything

Is there any other symptoms that would be occuring if the ecu has an issue ?