Almost certainly there's an air leak in either a fuel hose or the hand primer pump itself .
If _any_ fuel hoses you can see , are wet or even have tiny cracks , replace all hoses in that set .
Don't forget to wiggle the thin return hoses between the injectors , often they'll look fine but leak copiously or break right off once you touch them .
The hose and clamps you choose , are very important ! screw typ hose clamps will not tighten fully and American made fuel hose is the wrong outer diameter so when you fully tighten the proper and better German band typ hose clamps , they cannot apply sufficient force .
If you can twist a clamped fuel hose by hand , it's _NOT_ tight enough and it _WILL_ leak air in even if no fuel leaks out .
-Nate
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