Mercury MerCruiser MCM 454 Mag MPI Service Manual page 669

GENERAL SYSTEM DIAGNOSTICS
Chart A-4 (5 of 5): Fuel System Diagnosis (Continued)
12
13
14
15
16
17
18
Index
Page 5E-76
Downloaded from https://needmanual.com/
Ignition "OFF".
1.
Disconnect fuel return
2.
line.
Following manufac-
3.
tures recommenda-
tions, connect a hose
to pressure regulator
side of return line.
Insert the other end
into an approved gas-
oline container.
Ignition "ON." Note
4.
fuel pressure within 2
seconds of ignition
"ON."
Is fuel pre sure within
the specified value?
Check for restricted fuel
return line from fuel
pressure regulator
water separating fuel
filter adapter.
Was a problem found?
Locate and repair
vacuum source to fuel
pressure regulator.
Is action complete?
Locate and repair leaking
injector(s).
Is action complete?
Replace faulty fuel
pressure regulator.
Is action complete?
Locate and repair
restricted fuel return line
to water separating fuel
filter adapter.
Is action complete?
Check for leaking pump
fittings or lines, inlet filter,
and low battery voltage. If
OK, replace faulty fuel
pump.
Is action complete?
34-38 psi
(234-262) kPa
Go to Step 17
to
–
System Check
–
System Check
–
System Check
–
System Check
–
System Check
–
System Check
SERVICE MANUAL NUMBER 23
Go to Step 13
Go to OBD
Go to Step 16
Go to OBD
–
Go to OBD
–
Go to OBD
–
Go to OBD
–
Go to OBD
–
90-861326--1 MARCH 1999