Fuel pressure testing

[eddieguy]

Make

Ford

Model

Mercury grand marquis

Year

1990

Miles

200,000

Engine

5.0 liter

Can someone tell me where in the engine bay is the place to go to for releasing the fuel pressure on this vehicle And what you do to release the pressure
Also is there a Schrader valve or something on the fuel rail that allows me to use a gauge to test fuel pressure on this vehicle?
This is my brothers car so I’m not quite as familiar with it
Thanks for any replies

 

[eddieguy]

Guess I should’ve added to my post that I wanted to both replace the fuel filter which I see the location for it and I also want to Find a place along the fuel rail or where the Schrader valve is for using a gauge to test fuel pressure

 

[billr]

I don't really know on that engine, but the 4.2L V-6 that is probably from the same family, has the fuel test port toward the base of the TB, on the driver's-side. Not easy to see or get to...

 

[grcauto]

Have you looked at the fuel rail?