Quote:
Originally Posted by LJD
Hi Bernard
what should the mechanics 100% do to ensure the gauge works correctly?
cheers
Luke
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Hello Luke , First thing is check the in tank rheostats , the resistance is maximum with an empty tank at approx 390 ohms and has a linear decline to zero ohms with a full tank . Not sure what your connections are , on MY2004 V70 D5 Euro 3 there is a 5 pin plug on top of the pump/sender on the offside so its easy checking each sender . On earlier D5s and petrol V70s/S60s etc the connections all come out the opposite sender on the nearside and more fiddly to check . The senders are reliable and normally last as long as the car , most likely problems are sticking or someone has broken the arm locating clip on the nylon pivot at the top of the pump housing ( this can happen when removing the assembly ) then the steel arm going to the float can stick in one position . Also check the arrow on top of the pump is pointing to the rear of the car , if not the float arm will not have free movement . The computer takes an average of the two resistance readings to calculate the range and to control the fuel gauge .