Schrader valve on fuel rail.
65 pounds of feul pressure
On a 2006 Ford E-250 : The GASOLINE engines take ( " regular " unleaded , 87 octane )
check odb codes and check o2 sen.
check to the car manual but normally for ford fucus is 32 psi.
Check the underhood sticker or the build tag.
With a digital volt meter.
.052 to .056 inch , according to the Owner Guide ( Check the Vehicle Emission Control Information decal in your engine compartment )
Read the side of the tire you have on it or individually. It says PSI.
Where is the computer located in the 1995 ford e250 4.9l engine
According to the 2006 Ford Expedition Owner Guide : The " CHECK GAGE " light comes on if the engine coolant temperature is HIGH or the engine oil pressure is LOW
when it flashes it is setting the code
Check your owner manual to be certain, however, I believe 30 psi "cold."