Should 99 Mustang Hold Fuel Pressure When Off?

[NateM]

I have been experiencing rough starting. My fuel pressure drops soon after turning the car off. Is this normal in a 99 mustang v6?

 

[Zhen]

IDK about holding pressure when off, but on my 96, I hear the fuel pump run momentarily and switch off after turning the ignition switch to ON prior to cranking. Pressure at the fuel rail for the '99 should be 35-50psi with the engine running and 25-40psi with the key on/engine off. If gauges show these in specs, your problem is likely elsewhere.

 

[madspeed]

are you dxperiencing problems or just asking a general q?

 

[NateM]

When measuring the pressure in my 99 stang, it drops down to zero pressure 1-2 minutes after shutting off car. Is this a problem or normal. It runs around 30-32 psi.

 

[NateM]

I answered my question with a new motorcraft pump in my car. No longer drops pressure. It appears as though this is not normal afterall.