Re: 1955 ford station wagon with a V8 302 Engine.
Just a comment here-
Having an engine idle in the shop (especially with the hood open) will not allow the engine to come to full temp (unless there is a flow blockage somewhere).
It is akin to a tech measuring oil pressure drop on a running engine in the shop. Unless the vehicle is driven to allow the engine to fully heat, the results mat be skewed.
On the subject of clear hose, do not use fish tank style. There is hose available rated for gasoline and light pressure to make a test only hookup.
Personally, I have an old GM TBI fuel pressure tester (low pressure) that can be inserted into the supply line.
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