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:
Vacuum test:
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.
Result:
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.
What do you think?
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.
Result:
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.
What do you think?
Yesterday I did drop the tank and removed the pump.
I could not see any issues. Here some pictures from the hanger:
The tank looks clean inside. No visible debris.
The grommet of the Fuel Tank Vent Valve is quite worn. It has a lot of cracks so I ordered a new one.
I had a new 255 LPH universal fuel pump at home so I installed it on the old hanger:
On this hanger the rubber lip is missing on the return line:
I could use the one from the new hanger but I still would like to know if this thing is important and what it does or if I even could run the pump without it.
So I will install this pump these days and hope it will deliver the required pressure.