Fuel Level Sender Unit Query
Posted: Sun Oct 10, 2010 5:05 pm
I've pulled the fuel level sender unit as a step in my tank cleaning, as when I had the tank filled with rinse water there was a leak from around the "live" contact screw. I've pulled the unit apart, and it clearly needs a thorough cleaning (and yes, I'll be very careful with the rheostat windings). And I believe that I can re-seal the live contact screw to the backing plate and cure the leak. But two questions now arise:
1. Should the unit housing form a liquid tight seal with the backing plate? There would have been no leak from the contact screw hole if the liquid had not been bathing the interior of the unit. If it should be liquid tight, it should be a simple matter to lay down a bead of some fuel-resistant sealer before I re-assemble.
2. What are the resistance values for the unit at dead empty and full? I'd like to test it once it's back together, and I can't recall whether it was all that accurate when I laid the car up awaiting repairs. I expect Brian's book might have these, but I'm afraid I'm flying blind until I can place my order.
1. Should the unit housing form a liquid tight seal with the backing plate? There would have been no leak from the contact screw hole if the liquid had not been bathing the interior of the unit. If it should be liquid tight, it should be a simple matter to lay down a bead of some fuel-resistant sealer before I re-assemble.
2. What are the resistance values for the unit at dead empty and full? I'd like to test it once it's back together, and I can't recall whether it was all that accurate when I laid the car up awaiting repairs. I expect Brian's book might have these, but I'm afraid I'm flying blind until I can place my order.