GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
Chart A-4 (3 of 5): Fuel System Diagnosis
Step
Action
Value(s)
–
Yes
No
Was
the
“On-Board
1
Diagnostic” (OBD) System
Check performed?
Go to OBD
System Check
Go to Step 2
1.
2.
3.
Install fuel pressure
gauge.
Ignition “OFF” for 10
seconds.
Ignition “ON.” Fuel
pump will run for
about 2 seconds.
Note fuel pressure
with pump running.
The pressure may
4.
34-38
drop after the pump (234-262) kPa
stops running, but the
psi
2
press re should not
drop immediately to 0
psi. System should
hold pressure for at
least
15
to
20
seconds.
Is fuel pressure within
specified value?
Go to Step 3
Go to Step 5
Go to Step 4
Start engine and idle at
normal operating temper-
ature.
3-10
(21-69
psi
kPa)
3
4
Refer to
Symptoms
Section
Is fuel pressure lower
by the specified value?
With engine still idling,
connect
an
external
vacuum source to the fuel
pressure regulator and
3-10
(21-69
psi
kPa)
apply
10
inches
of
vacuum.
Is fuel pressure lower
by the specified value?
Go to Step 14 Go to Step 16
Go to Step 6 Go to Table A-5
Was
fuel
pressure
5
6
–
–
present at all?
Does the system estab-
lish fuel pressure and
then drop immediately
to 0 psi?
Go to Step 7
Go to Step 9
Index
Page 5E-74
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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