OTC 7448A Operating Instructions And Parts List Download Page 3

© 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 specifications. Connect the Fuel Injector Cleaner to the inlet of the fuel 

rail. 

Note: To keep cleaner fluid from going back to tank, block the fuel return line or adjust the regulator 

to run vehicle at 5 PSI under fuel pressure specifications.

10.  Turn regulator on top of Fuel Injector Cleaner to full OPEN position (counterclockwise).

11.  Attach a shop air hose to fitting on top of cleaner container.
12.  Adjust regulator (by turning it clockwise) to vehicle manufacturer’s fuel running specification, 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 fitting. 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 

specific to each vehicle system.

Socket 

Coupler

Figure 1

Regulator Assembly

Shut-off 

Valve

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