The fuel system is under a constant pressure, even with engine
off. before servicing the fuel filter/fuel pressure regulator, the fuel
system pressure must be released.
CAUTION
The fuel system is under pressure when the engine is running, 58
psi, plus or minus 5 psi. (400 kPa plus or minus 34 kPa). The fuel pump
module contains a check valve to maintain some fuel pressure even when
the engine is not operating. This will help to start the engine. Before
servicing the fuel filter/fuel pressure regulator, the fuel system
pressure must be released.
Hope this help.
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