Yamaha 25BMH 30HMH Factory Service Manual, Page 162Get this manual
FUEL JOINT, FUEL FILTER, AND FUEL PUMP
CHECKING THE FUEL JOINT
1Check: Fuel joint Cracksdamageleak Replace Seal Cracksdamage Replace
2Measure: Fuel joint operation Impossible to maintain the specified pressure for 10 secReplaceMeasuring steps (1) Attach the vacuumpressure gauge set