OTC 7448A Use and care manual

© Bosch Automotive Service Solutions Inc.
Sheet No.
Issue Date: Rev. F, June 22, 2017
Form No. 107340
1 of 3
Parts List &
Operating Instructions
for: 7448A
1
2
5
Fuel Injector Cleaner
1 567710 1 Fuel Injector Cleaner Canister
2 581340 1 Hose (1/8 NPTF x 6' Lg.) with connectors
3 517145 1 Rubber Gauge Cover
4 313575 1 Pressure Gauge
(0-100 PSI / 0-7 BAR)
5 213299 1 Air Regulator
Item Part
No. No. Qty. Description
655 Eisenhower Drive
Owatonna, MN 55060 USA
Phone: [phone]
Tech. Serv.: [phone]
Fax: [phone]
Order Entry: [phone]
Fax: [phone]
International Sales: [phone]
Fax: [phone]
3, 4
This document contains product
parts lists, and information regarding
operation and maintenance. Items
listed in the parts list have been
carefully tested and selected by
OTC. Therefore: Use only OTC
replacement parts.
Product questions can be directed
to the OTC Technical Service
Department at [phone].
Get parts at
OTCparts.com.
Replacement Parts

Safety Precautions
WARNING: The following safety precautions must be carefully observed to reduce the risk of
re and personal injury.
•Read, understand, and follow safety precautions and instructions. If the
operator cannot read these instructions, operating instructions and safety
precautions must be read and discussed in the operator’s native language.
• Operator of the 7448A Fuel Injector Cleaner and bystanders must wear face
shields.
•OTC 7448A and OTC 7000A are designed for use on gasoline engines ONLY. Do
not use this tool for diesel applications.
• Observe normal precautions for working with ammable liquids: no smoking,
open ames, electrical sparks, etc.
•Use the OTC 7448A in well ventilated areas.
• Pressurized liquid and accumulated fumes can ignite. Keep a Class B re
extinguisher nearby when working on fuel injection systems.
•Do not modify any components of the OTC 7448A.
• Do not replace any components of the OTC 7448A except those specied by
OTC.
• Use the vehicle manufacturer’s recommended procedures to service injectors.
Never exceed the vehicle manufacturer’s recommended pressures.
oRelease fuel system pressure before servicing fuel system components.
o Wrap a shop towel around pressure tap ttings when connecting or
disconnecting adapters to / from the vehicle and when disassembling the
canister after use.
o Tighten all connections; fuel leakage could cause a re.
oDo not exceed 100 psi maximum hose pressure.
o Keep hose away from moving engine parts, hot engine components, and
battery terminals.
oInspect the hose for damage before using the OTC 7448A. Check the inside
of the hose to conrm there is no blockage. Replace the hose if needed.
o Replace injector o-rings whenever injectors are removed.
Parts List & Operating Instructions Form No. 107340, Sheet 1 of 3, Back

© Bosch Automotive Service Solutions Inc.
Sheet No.
Issue Date: Rev. F, June 22, 2017
7. Remove the top and regulator assembly from the Fuel Injector Cleaner container. Pour fuel injector cleaner
(one can of OTC No. 7000A - Pro Inject-R-Kleen®) into container. Install top and regulator assembly.
8. Use the chain and hook to hang the Fuel Injector Cleaner from the hood of the vehicle.
9. Refer to the vehicle service manual — or optional OTC Professional Fuel Injection Application Manual — to
determine fuel pressure operating specications. Connect the Fuel Injector Cleaner to the inlet of the fuel
rail. Note: To keep cleaner uid from going back to tank, block the fuel return line or adjust the regulator
to run vehicle at 5 PSI under fuel pressure specications.
10. Turn regulator on top of Fuel Injector Cleaner to full OPEN position (counterclockwise).
11. Attach a shop air hose to tting on top of cleaner container.
12. Adjust regulator (by turning it clockwise) to vehicle manufacturer’s fuel running specication, or 5 PSI
under the manufacturer’s specs. to prevent fuel return.
13. Open shut-off valve to full OPEN position (counterclockwise).
14. Start engine and let it run at 1,000 – 1,500 RPM. Note: Adjust air pressure to obtain a smooth RPM, if
necessary.
15. Run engine until container is empty and engine stalls.
16. Turn OFF ignition.
17. Turn shut-off valve to full OFF (clockwise).
18. Disconnect air supply. Turn regulator to full OPEN (counterclockwise) to release pressure in container.
19. Remove cleaner. Remove fuel adapter tting. Connect fuel line. Remove block on fuel return line and
connect fuel return line, if applicable. Connect fuel pump power.
20. Start the engine and check for fuel leaks.
Parts List & Operating Instructions Form No. 107340
2 of 3
1. Read, understand, and follow the
Safety Precautions on the previous
page before using the Fuel Injector
Cleaner.
2. Run the engine until it reaches
normal operating temperature.
3. Shut OFF the engine. Turn OFF all
accessories.
4. Disable the fuel pump. Note: It is
best to unplug the fuel pump at the
fuel tank. On some vehicles, pulling
the fuel pump fuse also disables the
ignition system or fuel injectors.
5. Turn OFF the shut-off valve at the
bottom of the Fuel Injector Cleaner
container. See Figure 1. Note: Valve
is OFF if it is turned all the way
clockwise.
6. Install the hose assembly on the
socket coupler as shown.
Cleaning Fuel Injectors
Note: The optional OTC Professional Fuel Injection Application Manual contains instructions and diagrams
specic to each vehicle system.
Socket
Coupler
Figure 1
Regulator Assembly
Shut-off
Valve

Parts List & Operating Instructions Form No. 107340, Sheet 2 of 3, Back
Decarbonizing the Engine
1. Read, understand, and follow Safety Precautions in this document before using the Fuel Injector Cleaner.
2. Run the vehicle until the engine reaches normal operating temperature. Shut OFF the engine.
3. Turn regulator on top of Fuel Injector Cleaner to full OPEN position (counterclockwise). Leave the tting
on the end of the regulator open— do NOT connect shop air.
4. Close the shut-off valve at the bottom of the Fuel Injector Cleaner. Note: Valve is OFF if it is turned all the
way clockwise.
5. Remove top and regulator assembly from Fuel Injector Cleaner. Fill the container with up to 16 oz. of
decarbonizing uid. Install top and regulator assembly.
6. Connect the canister hose to a decarbonizing adapter such as OTC No. 7666.
7. Locate a manifold vacuum port (NOT ported vacuum) near the throttle body or carburetor. This will more
evenly distribute the decarbonizing solution.
8. Connect the decarbonizer hose (with adapter) to the manifold vacuum port. See Figure 2.
Manifold
Vacuum Port Throttle Body or
Carburetor
Intake Manifold
Engine
Decarbonizing
Adapter
(OTC No. 7666)
7448A
Canister
Figure 2
9. Start the engine. Manually increase throttle to 1,500 RPM while slowly opening the shut-off valve. The
engine will run rough and RPM will decrease. Do NOT manually increase RPM.
10. When the container is empty, turn OFF the engine.
11. Remove the adapter tting from the engine. Connect the vacuum hose.
12. Let the vehicle sit for at least 30 minutes to allow the solution to work on soft carbon deposits.
13. Test drive the vehicle for at least 15 miles to ush loosened carbon deposits out of the system.
Note: Until the system is cleaned out, the vehicle may start hard, run rough, and there may be heavy
white smoke from the tailpipe.

© Bosch Automotive Service Solutions Inc.
Sheet No.
Issue Date: Rev. F, June 22, 2017
Parts List & Operating Instructions Form No. 107340
Cleaning the Fuel Injector Cleaner
1. Install the quick coupler onto the end of the hose assembly.
2. Turn OFF the shut-valve at the bottom of the fuel injector cleaner. Note: Valve is OFF if it is turned all the
way clockwise.
3. Turn regulator on top of Fuel Injector Cleaner to full OPEN position (counterclockwise).
4. Attach a shop air hose to the tting on top of the cleaner container.
5. Insert the hose into a suitable container.
6. Adjust the air regulator to 50 PSI.
7. Turn the valve on the bottom the fuel injector cleaner to the OPEN position.
8. Let the cleaner ow into the container until the hose is empty.
Figure 3
Regulator Assembly
Shut-off
Valve
3 of 3
Remove quick coupler
from holder and install
on end of hose.