09-21-2010, 02:48 AM
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CC Member
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Join Date: Aug 2004
Location: Geelong,
Vic
Cobra Make, Engine: Classic Revival.
Posts: 215
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Not Ranked
Hi Cameron,
The old sender may be repairable by carefully removing the float arm from the unit and bending the wiper arm back so it again makes contact with the variable resistance printed on the circuit board. The circuit board and arm wear over time so they may no longer make contact. You can disassemble the unit to remove the arm to bend the contacts back (be careful to to go over board). Watch out you don't lose the spring when you do it, tend to fly off when you pull the unit apart. Be acreful not to otherwise bend the float arm or you will stuff up the readings you get. You can test if it's fixed with a multimeter measuring the resistance (see your shop manual).
2 Ohms Low stop 12 Ohms Empty 2.3 Ohms pre EB II
66 Ohms Half 81.2 Ohms Pre EB II
149 Ohms Full 200.7 Ohms Pre EB II
176 Ohms upper Stop
The VDO gauge itself should read 10 ohms empty, rising to 180 ohms when full.
Also check to make sure you have a common continuous ground between sender and gauge.
Hope this helps.
Dale
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