My FPR tester arrived today as well as my vacuum leak tester.
Fuel pressure with key on:
Fuel pressure after 15 minutes (key off), while idling, while accelerating, with connected and disconnected vacuum line on FPR:
What do you think?
I would say I have issues with my fuel pressure as the gauge readings do not change as expected.
I tested the FPR with the vacuum gauge and it did hold the vacuum.
I have installed a new fuel pump incl. hanger and strainer. Maybe the fuel pump is not strong enough? It came up in the parts list of RockAuto so I assume it should be the right one...
Regarding the vacuum test:
The needle is vibrating once the reading is steady.
In this video it is said that this could be worn valve guides:
Could this be the case or are these vibrations "normal" on a 302?
I was following the guide of @jrichker.
Exception: For the fuel pump test I removed the hose of the return line next to the tank as I don’t have a fuel line disconnection tool and the fuel lines around the gas tank are rubber fuel lines with some standard clamps.
The fuel pressure stopped rising at 48 psi. It was also rising very slow.
I reassembled all and tested the pressure again. No change with vacuum line on or off the FPR.
So I would assume the pump does not produce enough pressure.
That little red or orange thing is actually a drain back valve. It's common for high flow pumps to blow them off. Never seen a real issue because one is missing. May cause you to have to cycle the key....with my FPR I have to do that anyway.