b&k dyna quik tube tester

[dieseljeep]

Make sure it isn't in a damp envirement. The leakage test is very sensitive on that model. The inside of the case is raw plywood and will pick up moisture. I sprayed the inside with clear Krylon and the problem wasn't as severe. The best thing to do is turn the tester on about a half hour before using it. See if it works properly them.