Question about HPFP and LPFP

[Dzchey21]

Correct.

There is a tire looking valve on the fuel cooler. That's a pretty good place to.check it. Should have positive pressure... doesn't need much.

The best way would be to check supply pressure but its almost impossible on a stock fuel system

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[White_monster]

Good way to check supply pressure would be to "T" a pressure sensor in where the fuel temp sensor is located. That sensor is located in the front of the fuel bowl. Have fun.