M20 -Strong smell of fuel after changing blue temp sensor

[jimf]

Hi folks,

After replacing my blue temp sensor on my 325i the car seems to be running fine but the smell of petrol is much stronger now. It was a bit rich anyway and I had assumed it was the broken sensor that was causing it. Does the ECU need to relearn the parameters when a new sensor is installed?

[arrisbmw]

if you have a strong smell of petrol , check all petrol pipes and hoses under the car and in the engine bay,
your either got a split hose or a leaking connection/ clip some where. there are quite a few joints in the fuel sys. hwere it goes from hard pipes to rubber.

[Speedtouch]

Did you check the sensor readings at the ECU socket, as per this guide from the Zone Wiki:

Testing the actual Sensor is a relative simple affair, requiring a multimeter.

Locate the ECU and remove its loom connection
Set your multimeter to measure resistance (Ohms)
Putt your multimeter electrodes onto pins 24 and 45 of the ECU (for facelift engines. For others, such as the 318iS, check the ECU Pinouts)
From cold, expect a reading in the region of 3500-4000 Ohms. Any more or less than this is not a huge issue
Reconnect, warm up the engine, and retest
From hot, expect a reading in the region of 330 Ohms. If your Blue Temp Sensor has not changed its resistance significantly, then it is at fault and should be replaced.

If you're not seeing these readings, it is possible the new sensor is faulty or wiring between it and the ECU is broken...

[blazed]

As above, but if all OK you disconnect the battery to reset the ECU. I normally do this over night but i think most people say 30 mins. Then let it idle for 10 mins before taking it for a drive.