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post #11 of (permalink) Old 06-07-2017, 05:51 PM Thread Starter
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Picked up a new sending unit today.
Did a test before dropping the tank.
Disconnected the wires from the old unit.
Grounded the new unit and hooked power to it and moved the float. The gauge responded.
Dropping tank and replacing old hoses. Once I get it buttoned up it should be good to go.
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post #12 of (permalink) Old 06-09-2017, 06:17 AM Thread Starter
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Bump in the road and a learning moment for others.
When you are replacing fuel tank components it makes a big difference which tank you have.
I was able to purchase locally the sending unit and filler/vent hoses.
These were factory replacement fitment.
The problem is that they were for a factory steel 15 gallon tank and not for a factory plastic 20 gallon tank.
None of the parts fit and I have since ordered tank specific parts - after my education that "fits your 84 CJ7" doesn't mean a lot.
My ignorance - since this is the first time I have ever had to get into the tank and replace anything.
This is a good time to replace the vent gaskets on the tank, too.
As well as removing any varnish in the tank. I'm opting for a pressure washer.
On a side note, the original sending unit was indeed bad. I took it apart and internally it was in broken in two.

No matter where you go, there you are.
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post #13 of (permalink) Old 06-23-2017, 09:48 AM
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I think that those plastic tanks weren't real common, so the parts for them aren't either. At least you found the problem. It's unlikely that two sending units should fail at the same time, but obviously it can happen. I think you were right to start at the speedometer, it being the common part to both failures, but . . .

EVERYTHING's easy for the guy who doesn't have to do it.
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