Fuel pressure testing

eddieguy

Hero Member
Joined
Dec 1, 2006
Messages
393
Points
18
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

Hero Member
Joined
Dec 1, 2006
Messages
393
Points
18
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

wrench
Staff member
Joined
Mar 12, 2007
Messages
7,577
Points
63
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...
 
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