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Sorry for the delay--Have not had a chance to get back to working on the jeep.
I bought a new pressure tester mine was damaged
will I get a true reading by just cranking the vehicle or just turn the key on and let the pump build the pressure itself--Also what is the reading supposed to be?
Do you think it was a coincidence that the battery went dead and the car has not run since?
You're looking for 40-45 psi and check it while you are cranking. Yes it appears a coincidence to the battery issue....at least at the point.
One more thing, check and see if the check engine light comes on when the key is turned to the on position.........not cranking.