EVAPO-RUST AND A FUEL SENDING UNIT
Well it's been 36 plus hours...
Either my used Evaporust has lost its ability to pull the rust from the parts or the yellow deposit was preventing it from working.
I ended up brass brushing much of the exposed metal.
I'm in the fence about the idea of soaking a good working sender.
Not the clean metal results I had expected.
I disassembled the sender, I have done this on a couple other senders that did not look this bad to start with and they came apart easily.
So here is why I'm in the fence...
The plastic standoff (3) broke in half when using a wrench to remove it.
Others I have it just slides off. There was rust on the threaded shaft under /inside the standoff so that is probably why it was stuck.
The rubber gasket (4) that goes between the body (8) and the standoff (3) was intact but stuck to the body (8) and threaded shaft (7) and did not come off in a usable manner. Others I have have slid off
The fiber washer (5) was also stuck to the shaft (7) and took considerable prying to get it off. It looks a bit swollen.
The rubber washer (6) represented by the red circle was squished behind all usability and came off only with scraping.
The rheostat (7) wire and board look perfectly fine and the total resistance checks out at 84 +/- ohms
The sweep (8) and arm look fine but the arm is rusted to the body and will not rotate. The sweep has the typical doughnut hole in it where it wore off the dimple moving back and forth on the rheostat board wire for 56 years ( maybe only 9 years as this dart was last registered in 76, assuming it is the original sender)
From Evaporust bottle.
#4 is accurate, no harm to the brass or resistance wire. I suspect the rubber would have been fine if it was in good shape to begin with. The fiber boards seem ok (except the #7 board but that might be the way it is naturally?)
So why am I on the fence...
I don't know if any of the damage I see is a result of age / rust / bad fuel or the evaporust.
The sender in post #9 might be a list cause.
I suspect that I could send my sender and parts to a rebuilders and it could be returned from the dead. They have parts and the proper rubber washers etc.
All I can say is good luck.
Well it's been 36 plus hours...
Either my used Evaporust has lost its ability to pull the rust from the parts or the yellow deposit was preventing it from working.
I ended up brass brushing much of the exposed metal.
I'm in the fence about the idea of soaking a good working sender.
Not the clean metal results I had expected.
I disassembled the sender, I have done this on a couple other senders that did not look this bad to start with and they came apart easily.
- Nut
- Lock washer
- Plastic standoff (broke taking off)
- Rubber washer
- Fiber washer
- Would have been a rubber washer (it was mostly desintredrated)
- Rheostat board and post
- Body of sender with float and sweep arm still attached.
So here is why I'm in the fence...
The plastic standoff (3) broke in half when using a wrench to remove it.
Others I have it just slides off. There was rust on the threaded shaft under /inside the standoff so that is probably why it was stuck.
The rubber gasket (4) that goes between the body (8) and the standoff (3) was intact but stuck to the body (8) and threaded shaft (7) and did not come off in a usable manner. Others I have have slid off
The fiber washer (5) was also stuck to the shaft (7) and took considerable prying to get it off. It looks a bit swollen.
The rubber washer (6) represented by the red circle was squished behind all usability and came off only with scraping.
The rheostat (7) wire and board look perfectly fine and the total resistance checks out at 84 +/- ohms
The sweep (8) and arm look fine but the arm is rusted to the body and will not rotate. The sweep has the typical doughnut hole in it where it wore off the dimple moving back and forth on the rheostat board wire for 56 years ( maybe only 9 years as this dart was last registered in 76, assuming it is the original sender)
From Evaporust bottle.
#4 is accurate, no harm to the brass or resistance wire. I suspect the rubber would have been fine if it was in good shape to begin with. The fiber boards seem ok (except the #7 board but that might be the way it is naturally?)
So why am I on the fence...
I don't know if any of the damage I see is a result of age / rust / bad fuel or the evaporust.
The sender in post #9 might be a list cause.
I suspect that I could send my sender and parts to a rebuilders and it could be returned from the dead. They have parts and the proper rubber washers etc.
All I can say is good luck.