Lexus SC300 / Lexus SC400. Service manual - part 508

COMPONENTS FOR REMOVAL AND
INSTALLATION

–

EFI SYSTEM

Fuel System (Fuel Pump)

FI–19

REMOVAL OF FUEL PUMP

(See Components on page 

FI–19

)

CAUTION: Do not smoke or work near an open flame
when working on the fuel pump.

1. 

DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY

CAUTION: Turn the ignition switch to ”LOCK”. Discon-
nect the cable from the negative (–) terminal of the bat-
tery. Wait at least 20 seconds before proceeding with
work.

2. 

REMOVE LUGGAGE COMPARTMENT FLOOR MAT

3. REMOVE 

SPARE 

TIRE

4. 

REMOVE LUGGAGE COMPARTMENT TRIM COVER

5. 

DISCONNECT FUEL PUMP CONNECTOR

6. 

REMOVE SEAT CUSHION AND BACK

7. REMOVE 

PARTITION 

COVER

Using a scraper, pry out the partition cover.

8. 

REMOVE FUEL PUMP
(a)  Remove the eight bolts, and disconnect the fuel pump

set plate from the fuel tank.

(b)  Remove the three nuts, and disconnect the fuel pump

bracket from the fuel tank.

(c)  Disconnect the fuel hose from the fuel pump bracket,

and remove the fuel pump, bracket and set plate
assembly.

FI–20

–

EFI SYSTEM

Fuel System (Fuel Pump)

INSPECTION OF FUEL PUMP

1. 

INSPECT FUEL PUMP RESISTANCE
Using an ohmmeter, measure the resistance between the ter-
minals.

Resistance:     0.2–3.0 

 at 20

°

C (68

°

F)

If the resistance is not as specified, replace the fuel pump
and/or set plate.

2. 

INSPECT FUEL PUMP OPERATION
Connect a test lead from the terminal 1 of the connector to the
positive (+) terminal of the battery; connect another test lead
from the terminal 2 of the connector to the negative (–) termi-
nal of the battery.
NOTICE:

•

These tests must be performed quickly (within 10

seconds) to prevent the coil from burning out.

•

Keep the fuel pump as far away from the battery as

possible.

•

Always connect or disconnect at the battery.

If operation is not as specified, replace the fuel pump and/or
set plate.

COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY

–

EFI SYSTEM

Fuel System (Fuel Pump)

FI–21

DISASSEMBLY OF FUEL PUMP

(See Components on page 

FI–21

)

1. 

REMOVE PUMP SET PLATE FROM FUEL PUMP
Disconnect the lead connector from the fuel pump, and re-
move the set plate.

2. 

REMOVE FUEL PUMP FROM PUMP BRACKET
(a)  Pull out the lower side of the fuel pump from the pump

bracket.

(b)  Remove the rubber cushion from the fuel pump.
(c) Disconnect the fuel hose from the fuel pump, and

remove the fuel pump.

3. 

REMOVE FUEL PUMP FILTER FROM FUEL PUMP
(a)  Using a small screwdriver, remove the clip.
(b)  Pull out the pump filter.

ASSEMBLY OF FUEL PUMP

(See Components on page 

FI–21

)

1. 

INSTALL FUEL PUMP FILTER TO FUEL PUMP
Install the pump filter with a new clip.

2. 

INSTALL FUEL PUMP TO FUEL PUMP BRACKET
(a) Connect 

the fuel hose to the outlet port of the fuel pump.

(b)  Install the rubber cushion to the fuel pump.
(c)  Install the fuel pump by pushing the lower side of the fuel

pump.

3. 

INSTALL PUMP SET PLATE TO FUEL PUMP
Connect the lead connector on the set plate to the fuel pump.

FI–22

–

EFI SYSTEM

Fuel System (Fuel Pump)