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CONTINUING FROM THE PREVIOUS POST , NOW LET US SEE WHY THE ENGINE STARTS ON AIR BUT FAIL TO START ON FUEL. 

AS I SAID EARLIER ALSO, LETS START FROM THE STARTING:-

1. THE QUICK CLOSING VALVE MAY BE CLOSED.
2. THE FUEL OIL FILTER MAY BE CHOCK.
3. AIR IN THE FUEL OIL LINE.
4. THE PUMP PLUNGER BARREL MAY BE STICKY.
5. THE RACK OF FUEL PUMPS MAY BE STICKY.
6. RELIEF VALVE OF FUEL OIL LINE OF THAT PARTICULAR GENERATOR MAY BE LEAKING HEAVILY.