Test your fuel system for VOLUMETRIC FLOW. Measured amount of fuel for x amount of time. Not sure what the spec is, but what happens is a filter in the tank clogs and restricts flow (I assume you have replaced the fuel filter...).
So the system often can pass the fuel pressure test, but not the volume test.... It is easy to observe.
SOURCE: Hi, I have a 1976
It is possible, it is called negative pressure. The canister at the fuel tank prevents this as well as a tight fuel cap. Either that or the fuel pump has weakened due to low power (check the relay) or the pump itself had weakened.
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