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What was your symptoms?

When the problem showed itself, I replaced both pumps with motorcraft rebuilds, same issue instantly

Mods: 100% nozzles added to previously replaced 10k mile motorcraft injectors dual fuelers(Elite kit), both have been replaced in attempt to repair Return fuel system, elite, regulated to 9.5 psi, monitored and sustained s476 kit, H&S Under heavy throttle, injection pressure falls off and...