C7 Engines for Caterpillar Built Machines Fuel System Pressure - Test Caterpillar


Fuel System Pressure - Test
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Table 1
Tools Needed 
Part Number  Part Name  Quantity 
1U-5470
or
198-4240 
Engine Pressure Group
or
Digital Pressure Indicator Gp 
3Y-2888  Connector 
3J-1907  O-Ring Seal 

Note: Both the 5P-2720 Probe Adapter Gp and the 164-2192 Probe Adapter Gp can be used with these tools. Use these additional tools to allow the future installation of pressure probes.

------ WARNING! ------

Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. Clean up fuel spills immediately.



NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.



NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "AVSpare Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on AVSpare products.

Dispose of all fluids according to local regulations and mandates.


The 1U-5470 Engine Pressure Group or the 198-4240 Digital Pressure Indicator Gp can be used in order to check the engine's fuel pressures.

Refer to Special Instruction, SEHS8907, "Using the 1U-5470 Engine Pressure Group" for the instructions that are needed to use the 1U-5470 Engine Pressure Group. Refer to Operation Manual, NEHS0818, "Using the 198-4240 Digital Pressure Indicator Gp" for the instructions that are needed to use the 198-4240 Digital Pressure Indicator Gp.



Illustration 1g01133823
(1) Unfiltered fuel port
(2) Filtered fuel port

During both normal operating conditions and load conditions, the fuel pressure should register the following range:

  • 400 to 525 kPa (58 to 76 psi)

At low idle, the fuel pressure at the fuel filter's inlet should be at the following amount:

  • 400 to 435 kPa (58 to 64 psi)

The fuel pressure to the passage for fuel supply should be the same amount, if you subtract the change in pressure (delta P) across the filter.

With a new filter, the pressure drop across the fuel filter typically registers the following amount:

  • 35 kPa (5 psi)

As abrasive particles collect in the fuel filter, the pressure differential across the filter will increase. When a filter becomes plugged, fuel supply pressure may drop as low as 69 kPa (10 psi) before a significant power loss is detected by the operator. Low fuel pressure will cause cavitation and internal damage to the unit injectors. The pressure differential across the fuel filter should not exceed 69 kPa (10 psi).

To check the filtered fuel pressure, follow this procedure:

  1. Remove the plug from fuel pressure tap (1).

  2. Install the connector, the seal, and the engine pressure test group to fuel pressure tap (1).

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