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B11 fuel sender

C

Cimbian

Just got it firing!
Joined
Aug 11, 2013
Messages
19
Location
BOGNOR REGIS
Ongoing issues with my 2006 B11 and suspect ECU misreading analogue inputs, particularly Lambda, engine temp and fuel sender. Rich running possibly due to lambda or temperature misreading and fuel gauge reads 50% i.e. full tank reads half when tank is full. Warning light comes on but takes only 11litres to fill.

Can someone tell me if the fuel tank sender is a resistive sensor or capacitive? I have readings in Ohms but this could be resistance or impedance. I did try a calibrated decade box in place of the sender but it made little sense, though did read low; however, I can't measure with a dim once powered unless it is resisted and I am measuring potential difference.

I really don't want to shell out for an ECU just for diagnostics.

Steve.
 
The fuel sensor is resistive, I had to replace mine, (bought it from Todd) as it would never indicate a full tank. I took the old one apart and a float slides up a resistive element. Ohms values , empty- full I think are given in the manual
 
The ECU only reads what the sensors tell it. Usually it is the sensor at fault, not the ECU. If you don't have diagnostic software, get it or find someone that has it. Common reasons for poor fuel mileage is a faulty engine temperature sensor. The ECU will only register a fault if the sensor doesn't give a reading, you need the diagnostic software to read sensors in real time to see if they are out of range. When you read the lambda sensor, see that the voltage is changing. It should change so rapidly you can't read the voltages, but in the real world, so long as it changes every 5 seconds or less it seems to behave OK.
 
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