Make sure there is no air in the system. Pump the primer pump, crack open the last return line. Did you replace both filters? The spin on one you need to make sure you prefill with fuel.

The in tank strainer could be plugged also.

The primer pump could be shot and could be an air leak.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes