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Next, open the needle valves fully and check for bubbles at control valve, along the entire length of hose and at the SAE fitting. DO NOT LEAVE GAS ON FOR MORE THAN 10 SECONDS. If soapy mixture starts bubbling, gas is leaking through the connection or hose. Turn the propane tank valve OFF and retighten the connection that is leaking gas. Repeat procedure with soapy mixture until gas no longer leaks. NEVER USE A FLAME TO CHECK FOR GAS LEAKS. Turn the propane tank valve OFF after each test. 5. Onc