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Check valve stuck in open position. Replace check valve. DANGER—Do not disassemble the check valve with tank pressurized. Open tank petcock valve to allow air to escape from tank prior to servicing. Air leaks from safety relief valve: Possible defective safety relief valve. Operate safety relief valve manually by pulling on ring. If it still leaks, it should be replaced. Excessive tank pressure. Defective motor/pressure switch. Replace. Air leaks at pump: Blown gaskets. Replace blown gaskets and