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For technical questions, please call 1-888-866-5797.

Item 64938

Specifications

Pressure Scale

௘±36,௘±௘N3D

Gauge Accuracy

± 1.6%

Important Safety Information

Read all safety warnings and instructions.  

Failure to follow the warnings and 

instructions may result in electric shock, fire and/or serious injury.   

Save all warnings and instructions for future reference.

1. 

Stay Keep your work area clean 
and well lit.  

Cluttered and dark 

work areas invite accidents.

2. 

Stay alert.  

Watch what you are doing, 

and use common sense when operating 
tools and equipment.  Do not assemble 
or use this product while tired or under 
the influence of drugs, alcohol, or 
medication.  A moment of inattention 
while operating tools and equipment 
may result in serious personal injury.

3. 

Wear eye protection.  

Wear 

ANSI-approved safety impact 
glasses and full face shield 

when using this product.

4. 

Do not force the Service Kit.  

Use the 

correct product for your application.  The 
correct product will do the job better and 
safer at the rate for which it is designed.

5. 

Maintain the Service Kit with care.  

Keep this product clean.  Properly 
maintained products are less likely 
to malfunction.  Do not use damaged 
products.  Tag damaged products 

“Do not use”

 until repaired.

6. 

Check for any condition that 
may negatively affect operation 
of the Service Kit.  

If readings are 

inconsistent, or if it appears that the 
fuel gauge is not functioning properly, 
the Service Kit should be serviced 
by a qualified service technician.  
Many accidents are caused by 
poorly maintained products.

7. 

Use only accessories that are 
recommended by the manufacturer 
for your model.  

Accessories that 

may be suitable for one product 
may become hazardous when 
used on another product.

8. 

Industrial applications must follow  
OSHA requirements.

9. 

Maintain labels and nameplates 
on the Service Kit.  

These 

carry important information.  If 
unreadable or missing, contact 
Harbor Freight Tools for a replacement.

10. 

Use the right product for the job.  

There are certain applications for 
which this product was designed.  
Do not use small products to do the 
work of larger industrial products.  Do 
not use this product for a purpose 
for which it was not intended.

Summary of Contents for MH-MF54

Page 1: ...ence 21d When unpacking make sure that the product is intact and undamaged If any parts are missing or broken please call 1 888 866 5797 as soon as possible Copyright 2021 by Harbor Freight Tools All...

Page 2: ...safer at the rate for which it is designed 5 Maintain the Service Kit with care Keep this product clean Properly maintained products are less likely to malfunction Do not use damaged products Tag dama...

Page 3: ...18 Do not smoke while performing any fuel injection tests or repairs 19 Always have a dry chemical Class B fire extinguisher within reach 20 Make sure to provide a suitable container to catch released...

Page 4: ...into this product but must be supplied by the operator SAVE THESE INSTRUCTIONS Applications Picture Description Application 1 High Pressure Gauge with Boot DQG RRN 36 Connects to 2 for basic testing 2...

Page 5: ...Z 6FKUDGHU Adapter Early GENERAL MOTORS TBI systems supply line 14 QWHUQDO ODUH Z 6FKUDGHU Adapter Early GENERAL MOTORS TBI systems supply line 15 PP External O Ring Adapter GENERAL MOTORS TBI supply...

Page 6: ...ting 8VH ZLWK VHH DERYH 30 M12 Female Banjo Fitting 8VH ZLWK VHH DERYH 31 0 WHUQDO O Ring Adapter RU YHKLFOHV ZLWK PP ILWWLQJV HONDA ACURA STERLING Multi Port PGM 32 0 WHUQDO O Ring Adapter 9HKLFOHV Z...

Page 7: ...QDO Internal Swivel Adapter For vehicles with metric threads European CIS CISE 47 0 QYHUWHG Flare Adapter Fuel fitting size found on some hard line fuel connections like TOYOTA 48 0 21 Pulse Dampener...

Page 8: ...bleed off assembly slowly to depressurize the fuel system 11 Refer to Safety Information before removing Tester from vehicle 12 Replace the protective cap onto the test fitting on vehicle Check for l...

Page 9: ...e gaskets from the banjo fitting so that the fuel inlet is once again connected to the fuel rail or cold start injector The test Adapter will hold the banjo assembly in position 6 Torque the Adapters...

Page 10: ...the service manual 9 Stop the engine and turn the ignition OFF 10 With free end of Bleed Off Hose in a suitable container press the button on side of Bleed Off Assembly slowly to depressurize the fuel...

Page 11: ...eve the fuel pressure Refer to the vehicle s service manual for specific pressure relief procedures 3 The connection with the vehicle s fuel injection system is on the fuel rail 4 A disconnect tool no...

Page 12: ...nections for leaks 9 Read the Gauge and compare the result with the pressure values in the service manual 10 Stop the engine and turn the ignition OFF 11 With free end of Bleed Off Hose in a suitable...

Page 13: ...throttle body or discharge side of the fuel pump 4 Assemble the 5 Adapter and Hose with Hose Clamps from the 4 Seal and Service Kit 5 Connect the 5 Adapter as assembled above between the disconnected...

Page 14: ...side of Bleed Off Assembly slowly to depressurize the fuel system 10 Refer to Safety Information before removing Tester from vehicle 11 Reconnect vehicle s fuel line and tighten all clamps securely Ch...

Page 15: ...elief procedures 4 The CIS system has a primary circuit with pressure regulated at the fuel distributor This is known as supply pressure primary pressure or line pressure The side of the Tester withou...

Page 16: ...Install Adapter s 32 33 34 35 37 38 40 41 42 43 44 45 or 46 and O Ring from the 4 Seal and Service Kit to the engine as required 6 Attach the female quick coupler on the Pressure Testing and Bleed Of...

Page 17: ...ol with clean cloth 3 Periodically check the threads for damage 4 Keep clean and free from dirt grease and grit 5 Store tool in its Carrying Case when not in use PLEASE READ THE FOLLOWING CAREFULLY 7...

Page 18: ...HVW GDSWHU Part Description 27 0 0DOH RXEOH DQMR EFI Pressure Test Adapter 28 0 0DOH RXEOH DQMR EFI Pressure Test Adapter 29 M8 Female Banjo Fitting 30 M12 Female Banjo Fitting 31 0 WHUQDO 2 5LQJ GDSW...

Page 19: ...For technical questions please call 1 888 866 5797 Item 64938 Diagram 9 10 11 12 21 7 8 2 3 26 27 28 29 30 1 24 23 22 20 19 18 17 16 15 14 13 6 5 25 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47...

Page 20: ...ranty excludes normal wear and tear and does not apply to products subjected to misuse use or operation other than for the intended purpose or not in accordance with the product manual abuse accident...

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