NHTSA ID Number: 10175966
Manufacturer Communication Number: WRD-20R
TSB/Document Date: 2020-06-02
Summary
Subaru
of America, Inc. (Subaru) is initiating a new safety recall for certain 2019 model year Ascent, Impreza, Legacy, and Outback vehicles in which the fuel pump may become inoperative.
Start the engine and allow it to run until it stalls. NOTE: Even after the engine stalls, there
will still be a small amount of residual pressure left in the fuel system. Crank the engine
another 5 seconds with the starter.
2. Enter the driver seat and lower all windows. Using the fuel gauge in the Combination Meter,
check the fuel level.
•
If the fuel gauge shows two thirds (2/3) or more: go to STEP 3
•
If the fuel gauge shows less than two thirds: go to STEP 4.
3. (STEP 3A:) If the fuel level is above 2/3, use the following procedure
and fuel pipe adapter 18471AA000 (required tool) for connecting to
the female fuel supply connection at the fuel rail. Connect the adapter
and clamp a length of fuel hose to the other end. Empty the hose into a
safety container as shown in the photo sequence below.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 9 of 47
Once the drain hose assembly is securely in place, connect the SSM4, turn the ignition ON and
from the Active test item menu, select Fuel Pump Control to operate the fuel pump. Drain the
fuel tank down until the fuel gauge reads at or below 2/3 full.
(STEP 3B:) Once available, the PREFERRED method for draining fuel will be to use the
special adapter p.n. 42099FL030. CAREFULLY remove the rear seat cushion assembly
and fuel pump access cover. Apply a length of door edge guard, flexible tubing or electrical
tape around the pump access opening as protection from cuts / abrasions from any sharp edges.
Release the quick disconnect fitting at the fuel pump outlet pipe. While covering the fuel pipe
with a clean shop cloth to catch any residual pressurized fuel, slide the fuel delivery pipe off
the fuel pump outlet. Insert the plastic temporary plug supplied in the kit into the removed fuel
delivery pipe. The one-time use temporary plug is included in the replacement fuel pump parts
kit.
•
Connect a sufficient length of 5/16” rubber fuel hose to the male hose barb portion of the
adapter fitting. Always secure it with a small hose clamp to prevent leakage. Remove the
plastic plug from the adapter and connect the adapter / hose assembly to the male fuel
discharge tube of the fuel pump as shown below. Put the other end of the rubber fuel hose
securely into a safety container to collect the drained fuel. Once the drain hose assembly
is securely in place, connect the SSM4, turn the ignition ON and from the Active test item
menu, select Fuel Pump Control to operate the fuel pump. Drain the fuel tank down until the
fuel gauge reads at or below 2/3 full.
Remove
Plug and
Discard
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 10 of 47
4. While holding the battery sensor firmly with one hand to avoid damage, loosen and disconnect
the ground terminal.
5. If not already done in STEP 3, CAREFULLY remove the rear seat cushion assembly, set it aside
in a clean, safe place and remove the fuel pump access cover. Take care to not damage the foam
seal.
REMINDER: ALWAYS remove the fuel tank filler cap to release any remaining vapor pressure.
6. Fuel Pump Assembly Removal:
•
CAREFULLY using HAND TOOLS ONLY, remove the fuel pump access cover while
paying close attention to avoid damaging the foam seal between the cover and vehicle body.
Replace the seal if damaged with p.n. 96077AJ00A (rare case). NEVER use air or electric
tools when performing this step
•
Apply a length of door edge guard, flexible tubing or electrical tape around the pump access
opening as protection from cuts / abrasions from any sharp edges.
•
Release the quick disconnect fitting at the fuel pump outlet pipe, and while covering the
pipe and connector with a clean shop cloth to catch any residual pressurized fuel,
slide the fuel delivery pipe off the fuel pump outlet tube. Insert the plastic temporary plug
into the fuel delivery pipe connector. The one-time use temporary plug is included in the
replacement fuel pump parts kit.
•
CAREFULLY using HAND TOOLS ONLY, remove the nuts securing the fuel pump top
plate to the fuel tank. CAUTION: If the nuts are hard to loosen, use a lubricant on them and
take care not to break the fuel tank studs. NEVER use air or electric tools when performing
this step
•
CAREFULLY remove the fuel pump assembly from the fuel tank. Use a vacuum tool
with a reservoir, squeeze bottle or an equivalent tool to remove residual fuel from the fuel
chamber of the pump assembly along with a small catch pan to prevent spilling fuel as the
pump assembly is removed. IMPORTANT: Do not let the fuel level sensor arm or float
contact the tank opening during removal.
7. Once the fuel pump assembly has been removed, install the applicable plastic plug tool into
the fuel tank opening to prevent contamination from entering the tank and fuel vapors from
accumulating in the vehicle interior. If the plug is not available, cover the opening with a clean
shop cloth.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 11 of 47
8. After disconnecting the pump and sending unit harness connectors from the underside of the
top flange, CAREFULLY remove the fuel sending unit from the pump chamber. Release the
retaining clip (a plastic trim tool is being used here) and slide the sending unit upward. NEVER
touch the contact surface of the sending unit and use care to avoid bending or otherwise damaging
the float arm and contact point.
•
CAREFULLY disconnect both the fuel pump and fuel sending unit harness connectors and
remove the wiring from the retaining clips. Note the wire routing prior to disassembly for
reference during reassembly.
•
Compress the spring (fuel filter assembly) and remove / discard the (one-time use) c-clip
(ring clip).
•
IMPORTANT: When releasing the retaining claws as described in the following steps,
move them only as far as needed to disengage them. If any break, the affected component
must be replaced.
•
Release the retaining claw for the tube at the bottom of the fuel chamber.
•
CAREFULLY release the 3 claws for the pump holder from the fuel chamber then raise the
pump / filter assembly upward.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 12 of 47
•
CAREFULLY remove the fuel tube assembly from the fuel chamber using a small flat-blade
screwdriver wrapped with protective tape as shown.
•
Using 2 small flat-blade screwdrivers, CAREFULLY release the 2 claws securing the fuel
pump to the regulator.
•
Release the 3 remaining claws at the bottom of the fuel pump then CAREFULLY press
down on the top of the pump to push it out the bottom of the fuel filter assembly.
STOP HERE DO NOT remove the pressure regulator or otherwise go any further with disassembly
of the fuel pump assembly.
IMPORTANT: Remove the o-ring and spacer from the original fuel pump. The spacer is reused. Put
the removed pump in a vise and crush it as shown above to eliminate any chance of it being reused.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 13 of 47
9. Install the New Fuel Pump Assembly:
•
Transfer the white plastic spacer (B) to the new pump and install
the new o-ring (A) from the kit to hold the spacer in place. Always
lubricate the new o-rings with gasoline. IMPORTANT: Always
confirm the original o-ring came out of the filter assembly during
disassembly. If not, use a rubber-tipped or plastic (non-marring)
pick tool to CAREFULLY remove it without scratching the filter
assembly bore.
Plastic
Non-Marring
Pick Tool
(C)
(A)
(B)
•
•
Install the new fuel pump into the filter assembly. IMPORTANT: Confirm all 5 retaining
claws are fully engaged back into their proper positions.
•
Replace all 3 rubber cushions (feet) on the bottom of the fuel chamber,
replacements are included in the kit. Failure to replace these may result in
a later noise complaint.
•
CAREFULLY refit the tube assembly back
into the fuel chamber until it clicks into
position.
•
Refit the tube back on to the bottom side of
the fuel chamber.
Refit the spring (B) to the rod with the snap ring groove then
re-install the pump / filter assembly into the fuel chamber.
IMPORTANT: Confirm tube (A) is routed UNDER the
retaining claw then lock all 3 claws in place.
(B)
(A)
•
Press the top of the pump assembly downward and install the new c-clip (ring clip) included
in the kit.
•
Re-connect the fuel pump harness. CAREFULLY refit the fuel level sensor assembly to the
fuel chamber. Put the (thinner) fuel lever sensor wires into the 2 retaining clips first followed
by the fuel pump wires IN THAT ORDER.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 14 of 47
10. IMPORTANT: Make sure all the sealing surfaces are free from fuel or foreign matter before
reinstalling the fuel pump assembly.
•
CAREFULLY reinstall the fuel pump assembly into the tank in the proper position /
orientation. ALWAYS use the new gasket included in the kit.
•
IMPORTANT: Use CAUTION to keep the fuel level sensor arm from contacting the fuel
tank opening. If the arm were to become bent, the fuel gauge may not read properly.
•
Using the illustrations below for reference, align the recess of the fuel pump upper plate
cushion to the protrusion (A) of the fuel pump assembly.
•
While keeping cutout (B) of the fuel pump upper plate toward the rear of the vehicle, align
protrusion (C) of the fuel pump upper plate cushion with the cutout.
•
Lightly hand tighten all nuts in the order shown below. Complete tightening of the 8
retaining nuts to the specified torque: 4.4 Nm, (3.2 ft. lbs. or 38 inch-pounds) in the order
shown below. NEVER use air or electric powered tools to tighten these nuts as the studs
may be damaged.
(B)
(C)
FRONT
of
VEHICLE
(A)
•
Remove and discard the plastic temporary plug from the fuel delivery pipe and re-connect the
pipe to the fuel pump outlet tube. Make sure the connector is all the way onto the outlet tube
then lock the slider. Tug on the delivery pipe to be sure it is fully locked in place.
IMPORTANT REMINDERS: Discard the plastic fuel line plug as it is a one-time use item.
Reusing the plug may damage the connector’s internal o-ring and cause a fuel leak.
•
Ensure both the pipe and tube are clean and dry
•
If the slider does not move easily, confirm the pipe is engaged on the tube
•
ALWAYS confirm the pipe is fully engaged after connecting and check for any leaks
11. Reconnect the harness connector to the fuel pump.
12. Reconnect the ground cable to the battery sensor. Torque to 7.5 Nm (5.5 ft. lbs.) while supporting
the sensor with the other hand.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 15 of 47
13. Turn on the ignition switch to run the fuel pump. The engine does not need to be started. Check
closely for any leaks around ALL fuel delivery tube connections removed as part of this repair
(including those under the hood if fuel was drained) and around the top plate
14. Reinstall the inspection cover.
15. Reinstall the seat cushion assembly while making sure the seat belt buckles are properly
positioned. IMPORTANT NOTE: If any of the plastic clips securing the seat cushion to the
body were displaced when removing the seat cushion, they MUST be replaced.
16. Return any removed fuel back to the vehicle.
17. Deodorize the vehicle interior as necessary.
END OF LEGACY / OUTBACK SERVICE PROCEDURES
Helpful TIPS for 2019MY IMPREZA and ASCENT Models:
The procedure for replacing the fuel pump on Impreza and Ascent is very similar to the Legacy and
Outback. The major differences are described here:
•
Both fuel pump assemblies are retained into the fuel tank by a threaded locking ring (ring
nut) instead of a top plate secured by studs and nuts. There are separate procedures for
tightening these ring nuts. A special tool (42099FL000) is used for both models. A 1/2-inch
drive breaker bar and Torque wrench (for Impreza) are also required. New ring nuts and the
required sealing rings are included in the replacement fuel pump part kits.
•
IMPORTANT: Always press down vertically on the center of the tool with one hand and
pull squarely on the bar or wrench with the other to keep it from slipping off the ring nut.
•
There are 2 procedures for tightening the ring nuts:
○ The Impreza ring nut is simply tightened to 96 ft. lbs. followed by a height measurement
check in 3 places to confirm there is no cross-threading. The black arrow indicates the
thread starting point.
○ The Ascent ring nut uses a starting point identified by aligning hash marks molded
into the top of the fuel tank with another set on the ring nut. Another set of molded in
hash marks 90 degrees to the right (90 degrees clockwise from the first set identify the
tightening finish point “Range Marks”. The Ascent procedure also includes a height
measurement check in 3 places to confirm there is no cross-threading.
ASCENT RING
IMPREZA RING
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 16 of 47
Ascent Ring Nut Markings:
•
Inspect the new ring nut and identify the set of 3 “teeth” close together as shown above.
NOTE: The center or middle line (GREEN tooth) must be aligned with the triangle ∆ mark
in the middle of the thread starting point hash marks as shown below. Also, there is another
∆ mark on the top of the fuel pump to be used as a reference for making sure the pump is
properly indexed inside the tank.
•
Once the initial alignment is done, start tightening the ring nut with the special tool. As it
tightens, the up and down movement of the fuel pump assembly will be reduced. Once this
up and down movement can no longer be felt (one full turn), it is VERY IMPORTANT
to make sure the indexing arrow of the fuel pump assembly stays aligned with the arrow in
the center of the starting point hash marks. At this point, the ring nut should only need final
tightening to get the middle line into the range of (between) the Finishing Point Range hash
marks. REMINDER: As the final tightening is completed, make sure the indexing arrow is
still aligned with the arrow in the center of the starting point hash marks. If not, loosen the
ring nut reposition the pump properly and re-tighten.
•
TIP: To help stop the pump from turning while tightening the ring nut, make sure the new
gaskets and all the surfaces they contact (top of fuel tank, top and bottom of the fuel pump
flange and both sides of the top seal plate) are thoroughly cleaned of any residual gasoline or
other contamination and completely dry. Areas to focus on are shown in red below.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 17 of 47
•
On Impreza, start the ring nut with the indexing
arrow centered between the hash marks.
Tighten the ring to 96 ft. lbs. IMPORTANT:
As the specified torque approaches, confirm the
indexing arrow on the fuel pump stays between
the hash marks. When successful alignment
and torque are achieved, perform the height
adjustment check procedure below.
Pump Indexing
Arrow
Height Adjustment Checks:
•
IMPORTANT: These height measurement checks MUST be made as a final check to
confirm the ring nut is not cross-threaded.
•
Ascent: 23.8 +/- 2.5 mm (.937 +/- .098 in.) measured in 3 positions around the ring nut. The
best tool for doing this measurement is a digital caliper as shown below. Measure from the
top edge of the ring nut “teeth” to the top surface of the tank.
•
Impreza: After the specified torque is reached, measure the height using a digital caliper as
shown below between the flats adjacent to the ring nut “teeth” to the top surface of the tank
in 3 places. All 3 measurements must be between 1.5 mm of each other.
ASCENT
IMPREZA
NOTE: In cases where the ring nut does not thread properly onto the fuel tank, it will be necessary
to “jump” one thread to avoid cross-threading of the ring nut and tank. To do this, begin threading
the ring nut onto the tank at a minimal angle until slight turning resistance is felt. The ring nut thread
starting points are identified by the triangle arrow ∆ on the Impreza ring and the set of 3 lines close
together on the Ascent ring nut (Green arrows in photo below and highlighted with black marker on
the parts). Once the resistance is felt, apply a quick, downward, non-percussive force to the side of
the ring opposite from where the threads were started. A slight “pop” sound should be heard. Once
the pop has been heard and while keeping downward pressure on the ring nut, continue threading the
ring nut onto the tank until it can no longer be turned by hand. Proceed with the remainder of the
tightening and height adjustment procedures as described above.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 18 of 47
ASCENT RING
IMPREZA RING
Other differences (between the Legacy / Outback procedure) to be aware of:
1. The fuel pump is secured to the filter assembly with 3 retaining claws instead of 5.
LEGACY / OUTBACK PUMP
IMPREZA / ASCENT PUMP
2. Instead of having 2 fuel line connections on the pump assembly, Impreza and Ascent only use 1.
3. Impreza does not utilize a “saddle” type fuel tank therefore, there is also no jet pump.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 19 of 47
4. Both models utilize a large o-ring seal between the
fuel pump assembly and the tank instead of a rubber
gasket. Ascent uses an additional blue plastic sealing
washer between the lock ring and top of the fuel pump
assembly.
5. Ascent has a jet pump fuel line connection to the fuel
chamber inside the tank. When removing this line, if
desired, it can be secured either with tape or a piece of
Mechanic’s wire under the connector slider to keep it
from dropping inside the fuel tank.
END OF IMPREZA & ASCENT TIPS
FUEL PUMP REPLACEMENT for 2019MY IMPREZA Models:
IMPORTANT PRECAUTIONS:
•
Place “NO OPEN FLAMES” signs near the working area.
•
Be careful not to spill any fuel, especially when working inside the vehicle.
•
Catch any leaking fuel from the removed fuel tube(s) using a small drain pan or cloths.
•
If the fuel level in the tank is 2/3 full or more, drain the fuel to below 2/3 full before starting
this procedure to avoid spilling any fuel.
•
To prevent static electricity discharge / spark, always discharge any static electricity before
starting this procedure using an anti-static cord and / or touching a grounded metal part of the
vehicle body (e.g. door striker).
•
Insure there is plenty of ventilation by opening windows of the vehicle and the service area.
•
ALWAYS remove the fuel cap to release any accumulated evaporative / vapor pressure.
As mentioned earlier, select Fuel Filter REMOVAL in the applicable Service Manual to get the
complete, detailed procedure for separating the fuel pump / filter sock from the complete fuel pump
assembly. The following instructions will follow the Service Manual with additional photos to help
clarify the step where applicable.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 20 of 47
1. Park the vehicle where the work will be performed. Release the fuel pressure:
•
Locate and remove the fuel pump fuse in the under-hood fuse box (M/B).
•
Start the engine and allow it to run until it stalls. NOTE: Even after the engine stalls, there
will still be a small amount of residual pressure left in the fuel system. Crank the engine
another 5 seconds with the starter.
2. Enter the driver seat and lower all windows. Using the fuel gauge in the Combination Meter,
check the fuel level.
•
If the fuel gauge shows two thirds (2/3) or more: go to STEP 3
•
If the fuel gauge shows less than two thirds: go to STEP 4.
3. (STEP 3A:) If the fuel level is above 2/3, use the following
procedure and fuel pipe adapter 18471AA000 (required tool) for
connecting to the female fuel supply connection at the fuel rail. On
Impreza, removing the intake air duct makes the connection point
easier to access. Connect the adapter and clamp a length of fuel
hose to the other end. Empty the hose into a safety container as
shown in the photo sequence below.
Continued...
Bulletin Number: WRD-20R; Revised: 05/07/20
Page 21 of 47
Once the drain hose assembly is securely in place, connect the SSM4, turn the ignition ON and
from the Active test item menu, select Fuel Pump Control to operate the fuel pump. Drain the
fuel tank down until the fuel gauge reads at or below 2/3 full.
(STEP 3B:) Once available, the PREFERRED method for draining fuel will be to use the
special adapter p.n. 42099FL030. CAREFULLY remove the rear seat cushion assembly
and fuel pump access cover. Apply a length of door edge guard, flexible tubing or electrical
tape around the pump access opening as protection from cuts / abrasions from any sharp edges.
Release the quick disconnect fitting at the fuel pump outlet pipe. While covering the fuel pipe
with a clean shop cloth to catch any residual pressurized fuel, slide the fuel delivery pipe off
the fuel pump outlet. Insert the plastic temporary plug supplied in the kit into the removed fuel
delivery pipe. The one-time use temporary plug is included in the replacement fuel pump parts
kit. This plug is not required if the fuel pump assembly is being replaced due to the very short
disconnection time.
•
- Restores fuel economy
- Stabilizes ethanol
- Maximizes horsepower
- Improves responsiveness
- For use in both gasoline and diesel engines
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TSB/Document ID: WRD-20R
Replacement Service Bulletin Number:
MFR Communication Date: 2020-05-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT ADAPTIVE/MOBILITY
MFR Component System:
MFR Component Subsystem:
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