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Guest tanktop3
Posted

filled my 03 C3 SX 1.4 HDI up to the top on saturday untill it stoped for the second time then did only about 20 miles now down to five lights, where as this can take about 100+ miles for it to go out.

put 5 more liters in but the sixth light as not come on. :)

Guest tanktop3
Posted
filled my 03 C3 SX 1.4 HDI up to the top on saturday untill it stoped for the second time then did only about 20 miles now down to five lights, where as this can take about 100+ miles for it to go out.

put 5 more liters in but the sixth light as not come on. :)

ps all lights working and know leaks that i can see

Posted

My Brothers 2003 52 reg C3 SX Auto used to do the same now and again.

 

My 05 C3 Exclusive did it once. I filled up to the brim only 5 lights came on drove 2 miles and the 6th light came on.

Posted

Filling the tank and when the pump clicks off can vary dramatically.

 

Some garages pumps deliver at a faster rate, this induces foaming in the tank, especially with diesel. The foam effectively reduces the volume of the tank and comes up the neck of the filler and causes the gun to click off.

Other pumps deliver slower, it also depends upon the number of pumps in use at the sametime..

 

the other factors are temperature and the angle that the car is sat at, it it level more will go in.

 

Fuel gauhges on Citroens are driven via the BSI system which is fed an input from the tank unit. However the decrementing of the gauge is calculated by the ECU which measures the fuel used and takes that off the indication. When the engine and ignition are next switched OFF and then back ON again the tank unit updates the gauge.

 

On my C3 the distance between the top light going off will vary by up to 20 miles. A better indication is the distance to go till refuel after a computer reset. If your last average MPG were similar before refuelling then the distance to go will be similar.

  • 3 weeks later...
Posted

I'd agree.

 

The difference in mileage when the first light goes off can vary massively. I've known mine go off at as little as 70-odd miles or stay on until over 142.

 

As long as there are no signs of a leak and fuel consumption is staying fairly constant there is probably nothing to worry about.

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