Doffer Posted February 9, 2013 Share Posted February 9, 2013 (edited) I have an annoying air leak on my 2001 mack RD688S Cab-Over pump truck. The Secondary tank is holding air, but the primary is leaking off when sitting overnight. Can i dump some UV Dye into the tank and wait for it to leak off then check all the air lines with a UV light, or will the UV dye hurt something? Edited February 9, 2013 by Doffer Quote Link to comment Share on other sites More sharing options...
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