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Troubleshooting fuel gauge 700 1988

uid 5008's pic
posted by  Colin UK on  Mon Mar 15 12:18 CST 2004
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The easiest way to test the sender unit when it is out of the tank is to check the resistance with an ohm meter between the gauge connection and the body of the sender unit while you tip the assembly between upside down and right side up.
It should vary between approximately 40 Ohms upright and 250 Ohms inverted.

The sensor inside consists of two rods with spirally wound resistance wire and a float with a "U" shaped contact attached which bridges between these windings.

If you look closely at the assembly you can see the small barbs that need to be pushed in to unclip the outer tube and expose the internal workings.

It sounds as if the float on yours is, as you suspect, gummed up and sticking.

Colin.

1990 740SE B200E/M47, remote C/Locking.





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