My old Case 530 Roosa Master pump

My old Case 530 was my Grandfather's. I've owned since his passing in 1989. The tractor has always started and run flawlessly for all these years. After sitting for about a month, went to start and started up for a few seconds and quit. After checking all filters and screen filter in top of pump all found clean and flowing fuel. Then checked returned fuel line, all clear.
When cranking found NO fuel coming from pump banjo lines. My pump number is DBGFCC431-30JA. Any suggestions will be grateful.

My old Case 530 Roosa Master pump