These are the Ford Number , unless I am mistaken there is to different sizes From the lift pump to filter are E3TZ-9C387-A, larger one and from filter to injector pump are E3TZ-9K260-A, smaller one.
The fitting at the filter inlet from the lift pump takes one olive size 3/8 inch. Then the outlet from filter to the back of the injection pump and at the injection pump takes a 5/16 size olive. Now if... And only if you have the metal tube running down the side of the intake manifold from the injection pump return then way back at cylinder 8 you have another olive. Its in that brass fitting for the fuel return from both sides of the engine and returns to the fuel tank. I believe that hidden fitting is also 5/16 inch. Way too many owners have no idea this fitting or olive is there.
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