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I'm not sure I fully understand all that you stated, since you already changed the primer pump once, and now might do it again? It's a fairly simple system. First, fuel must be coming out of the bottom of the tank freely. The 350 has a fuel petc*ck (sorry, can't properly spell the word in this forum or it gets deleted).
It only has a tiny, maybe 1/8"or 3/16" hole and gets plugged easy. So, unhook the fuel line there - and check to see fuel is flowing. The fuel transer-pump - that you are calling a primer pump - sends low pressure fuel on to the injection pump. The OEM version also has a hand-pump lever for filter priming. Make sure it works and is not plugged - and check it by cranking the engine - do not trust tests made only with the hand-primer lever. Make sure fuel is actually getting to the injection pump. This ought to be the first thing you do. Just unhook the feed line to the back of the pump and crank the engine - and see if a good flow of fuel squirts out. Or - do the same at the filter housing by opening the bleeder screw. If you've checked all else - and you are sure the injection pump is getting fuel - but it won't run right - then you've got pump problem. If it's a model DB or JDB pump - and not the little round C pump - it is prone to breaking the internal plastic weight-retainer ring. That plugs the pump and makes it run lousy - and often keep quitting. It that is the problem, you need to pull the pump apart and fix it. It is a very common problem with all Stanadyne/Roosamaster D, DB, JDB, DC, and DB2 pumps up to year 1985.
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