hi i have a 2000 w reg focus zetec
i have to keep the fuel above 1/4 make
cos i i dont the starts playing up
loss of power can put my foot hard down and nothing
i have had 2 second hand fuel sender units fitted and still got the same problem
the car just wont pull it just slow down
i dont know if it a sensor or the ecu unit
i would like some help with this
thanks

When it gets down to quarter whip the sender out and see how much fuel is in there. It could be empty which would lead to faulty clocks as uv already done the sender.