C15A Restoration

[Mike K]

Originally Posted by John Stokes

Hi All,
Has anyone any clues on how to fix or restore fuel sender units? John Stokes

John

In most cases the problem with them is : gunk or oxidisation on the wiper contacts .. Inside the sender unit, there is a length of fine coiled wire on which, a wiper arm runs over . Some types you can disassemble and clean .. drill out the rivets that hold the body together . One trick .. drill a small hole in the body and spray some electrical cleaner into it .. move the arm up and down .. this may clean it without having to pull it apart .

On some of them.. the moveable wiper is earthed through the spindle shaft in the body .. there has to be a good electrical contact between the spindle shaft and the body .

You can use a cheap multimeter .. and check the thing out .

They normally don't ' wear out' in the normal sense of the word .. it's nearly always a good clean that is required .. and it will work fine .

Make sure you use twin core wire , from the sender unit , to the gauge on the dash .. one wire is your earth return .. attach it to one of the sender unit mounting screws.. the other end you attach to an earth point on the instrument panel e.g., a mounting screw or similar .. this means you will always have a good solid earth for the system .

CMP's have a peculiar 90 degree corner in the float arm device from memory .

Mike