FDS7 - Check Vacuum Supply

^ Key Off.

^ Vacuum hose removed from the fuel pressure regulator and plugged.

^ Install a hand operated vacuum pump to the fuel pressure regulator.

^ Start engine.

^ Observe fuel pressure while applying vacuum.

^ Does fuel pressure reading change as the vacuum changes?

YES -- Service vacuum system. Remove plug from vacuum hose and reconnect to fuel pressure regulator.

NO -- Replace fuel pressure regulator.