2003 HONDA CIVIC fuel pressure

PGM-FI System
Injector Replacement (cont'd)
7. Coatthenewo-rings(A)withcleanengineoll,andinserttheinjectors(B) intothefuel rail (C).
8, lnstall the injector clip {D).
9. Coat the injector o-rings (E)with clean engine oil.
10. Installthe injectors intothefuel rail, then install the fuel rail intotheintakemanifold(G).
1 '1. Install the fuel rail mounting nuts, ground cable. and bracket.
12. Connect the connectors to the injectors.
13. Connect the quick-connect fittings.
14. Turnthe ignition switch ON (ll), butdo notoperatethe starter. Afterthefuel pump runs for about 2 seconds, the
fuel pressure in the fuel line rises. Repeat this two or three times. then check for fuel leakage.
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11-112

FuelSupply System
Fuel Pressure Relieving
Before disconnecting fuel lines or hoses, relieve
pressure from the system by disconnecting the fuel
tube/quick connect fitting in the engine compartment.
1. Turn the ignition switch OFF,
2. Remove the PGM-Fl main relay 2 (A).
Startthe engine, and let it idle until it is stalls.
NOTE: The DTCS or Temporary DTCS P0301. P0302,
P0303, P0304 may come on during this procedure.
lf any DTCS are stored, ignore them.
Turn the ignition switch OFF.
Remove the fuel fill cap, and relieve fuel pressure
in the fueltank.
Remove the engine cover.
Disconnect the negative cable from the battery.
Check the fuel quick-connect fitting for dirt, and
clean it if necessary.
3.
4.
6.
7.
8.
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11
10.
9. Place a rag or shop towel over the quick-connect
fitting (A).
Disconnect the quick-connect fifting (A): Hold the
connector (B) with one hand and squeeze the
retainer tabs (C) with the other hand to release
them from the locking pawls {D). Pullthe connector
off.
NOTE:. Prevent the remaining fuel in the fuel feedlineor
hose from flowing out with a rag or shop towel.. Be careful notto damage the line (E) or other
pa rts.. Do not use tools.. lf theconnectordoes not move, keepthe retainer
tabs pressed down, and alternately pull and push
the connector until it comes off easily.. Do not remove the retainer from the line; once
removed, the retainer must be replaced with a
new one.
After disconnecting the quick-connect fifting, check
it for dirt or damage (see page 1 1-149).

Fuel Pressure Test
Special Tools Required. Fuel pressure gauge 07406-0040004. Fuel pressure gauge sel 07ZAJ-S5A0100
1. Relieve the fuel pressure (see page 1'1-144).
2. Disconnect the quick-connect fitting (A). Aftach the
fuel pressure gauge set and fuel pressure gauge.
Start the engine and let it idle.
. lf the engine starts, goto step 5.. lf the engine does not start, goto step 4.
Check to see if the fuel pump is running: listen to
the fuel fill port with the fuel fill cap removed. The
fuel pump should run for 2 seconds when the
ignition switch is first turned on.
. lf the pump runs, go to step 5.. lf the pump does not run, do the fuel pump circuit
troubleshooting (see page 1 1-1 41 ).
Read the pressure gauge. The pressure should be
320-370 kpa (3.3-3.8 kgf/cm', a7-52 psi)
. lf the pressure is OK, the test is complete.. lf the pressure is out of specification, replace the
fuel pressure regulator and the fuel filter (see
page 11-152), then recheck the fuel pressure.
5.
11-145

2.
Fuel Line/Ouick-Gonnect Fittings Removal
1. Relieve fuel pressure (see page 1'l-144).
Check the fuel quick-connect fiftings for din, and
clean if necessary.
Hold the connector (A) with one hand and squeeze
the retainertabs (B)with the other hand to release
them from the locking paws (C). Pull the connector
off.
NOTE:. Be careful not to damage the line iD) or other
parts. Do not use tools.. lf the connectordoes not move, keep the retainer
tabs pressed down, and alternately pull and push
the connector until it comes off easily.. Do not remove the retainer from the line; once
removed, the retainer must be replaced with a
new one.
4. C heck the contact a rea (A) of the line (B)for dirt and
da mage.
. lf the surface is dirty, clean it.. if the surface is rusty or damaged, replace the
fuel pump, fuelfilter, fuelfeed line.
=k
To prevent damaged and keep foreign matter out,
cover the disconnected connector and line end with
plastic bags (A).
NOTE:. The retainer cannot be reused once it has been
removed from the line.
Replaced the retainer when- replacing the fuel rail.- replacing the fuel feed Iine.
- replacing the fuel pumP.
- replacing the fuel filter.- replacing the fuel gauge sending unit
- it has been removed from the line.
- it is damaged.
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4. Align the quick-connect fittings with the line (A).
and align the retainer (B) locking pawls with the
connector {C) grooves. Then press the quick-
connect fittings onto the line until both retainer
pawls lock with a clicking sound.
NOTE; lf it is hard to connect, put a small amount of
new engine oil on the line end.
Connection with new retainer:
Reconnection to existing retainer:
5. lvlake sure the connection is secure and that the
pawls are firmly locked into place; check visually
and by pulling the connector.
6. Reconnectthe negative cable to the battery, and
turn the ignition switch ON (ll). The fuel pump will
run for about 2 seconds, and fuel pressure will rise
Repeat 2 or 3 times, and check that there are no
fuel leaks.
11-151

Fuel Supply System
{Fuel Pressure Regulator
Replacement
Remove the fuel pump (see page 1 1-153).
Remove the fuel pressure regulator (A).
Installthe part in the reverse order of removal witha new o-ring (B).
1.
2.
11-152
Fuel Filter Replacement
The fuel filter should be replaced whenever the fuelpressure drops belowthe specified value {270 320 kpa,2.8 3.3 kgf lcm', 40 47 psi), after making sure that thefuel pump and the fuel pressure regulator are OK.
1. Remove the fuel pump(seepagell-'153).
2. Remove the
Install in the reverse order of removalwith a new
base gasket (B) and a new o-ring (C), then check
these items:
' When connecting the wire harness, make sure
the connection is secure and the terminal (D) is
firmly locked into place.. When installing the fuel gauge sending unit iE),make sure the connection is secure and the
connector is firmly locked into place. Be carefulnot to bend or twist it excessively.
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fuel filter (A).
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Fuel Pump/Fuel Gauge Sending Unit Replacement
SpecialTools Required
Fuel sender wrench 07XAA-001010A
1.Relieve the fuel pressure (see page 11-144).
Remove the fuel fill cap.
Remove the seat cushion (see page 20-80).
Remove the access panel (A)from the floor.
5.
7.
Disconnect the fuel pump 5P connector (B).
Disconnect the quick-connect fitting {C) from the
fuel tank unit.
Using the special tool, loosen the fuel tank unit
locknut (A).
93 N.m19.5 kgf.m,69 lbf.ftl
11-153
8. Remove the locknut (A) andthefuel tankunit.
9. Remove the stopper {O). Release the hook (P) and
remove the fuel filter (B), the fuel gauge sending
unit (C). the case (D), the wire harness (E), and the
fuel pressure regulator (F).
10. When connecting the fuel tank unit, make sure the
connection is secure and the suction filter (G) is
firmly connected to the f uel pump (H).
11. Install the fuel tank unit in the reverse order of
removal with a new base gasket (l)and new o-rings
(J), then check these items:
. When connecting the wire harness, make sure
the connection is secure and the connector (K) is
firmly locked into the place.
. When installing the f uel gauge sending unit,
make sure the connection is secure and the
connector is firmly locked into place. Be careful
not to bend or twist the connector excessively.. When installing the fueltank unit, align the marks
(L) on the fuel tank (M) and the fuel tank unit (Ni

Fuel Supply System
Fuel Pulsation Damper Replacement
1. Relieve the fuel pressure(seepagell-144).
2. Remove the engine cover.
3. Remove the fuel rail mounting nuts from the fuelrail.
4. Remove the ground cable (G 101.
5. Raise the fuel rail.
6. Place awrench (A) onthefuel rail (B).
7. Place a wrench (C) onthefuel pulsation damper (D).
8. Remove the pulsation damper.
9. Installthe fuel pulsation damper in lhe reverse
order of removal with new washers.
NOTE:. Replace all washers wheneve r the fuel pulsation
damper is loosened or removed,. lf the drain hole (A) ofthefuel pulsationdamper
cover does not face bottom, reinstall it as shown.
11-154