The only thing that changed from before the problems started and now seems to be the passage of time. If the fuel supply hose to the engine is leaking air, it will be leaking air all the time and even after the engine is running. If you can temporarily tie a piece of clear tubing on the return line you may be able to see bubbles (there should be absolutely none) especially at idle when fuel flow is low. Alternatively a gauge that can read very slight vacuum installed in the supply line as close as possible to the first fuel pump should show a slight vacuum after the engine is shut down and should remain a slight vacuum if no leaks are present.
If check valves could be the problem they first have to be present and it seems your system has none, unless the mechanic didn't know his check valves from his other fittings.
The problem cannot be a restriction because once started you can go full throttle with no problem.
Let us know what you eventually find or provide more information on what you've tried and what resulted.
Jon
77 Newell with 6V92TA
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