please help
New install?
Verify the operation and output of the relay. Just because it "cliks" doesn't mean it's working on the power out side.
Verify the presence of power at the pump.
Check all the grounds.
Then probe the ground for continuity (set meter to Ohms, should read infinity or near-zero resistance with the other probe on any good chassis metal point.)
If these two tests pass, time to drop the tank and remove/inspect the pump.


