Posted on

Troubleshooting the Fuel Priming and Primary Filter Pump Gp and the Fuel Filter Base Assembly

Engine:Machine All 3412
C18 (S/N: EJG1-UP)
C7 (S/N: JRA1-UP; JTF1-UP)
Industrial Engine: 3126B
C11 INDUSTRIAL (S/N: GLS1-UP)
C13 INDUSTRIAL (S/N: LGK1-UP)
C15 IND (S/N: JRE1-UP)
C15 INDUSTRIAL (S/N: JAS1-UP)
C18 INDUSTRIAL (S/N: WJH1-UP)
C27 INDUSTRIAL (S/N: TWM1-UP)
C32 INDUSTRIAL (S/N: TLD1-UP)
C9 INDUSTRIAL (S/N: JSC1-UP; MBD1-UP; JLW1-UP) C-10 C-12 C-15 C-16 C-9
Machine Engines: 3408E
Machine Engines: 3126B 3176C 3406E 3456 C-12 C-15 C-16 C-9
Pumper:
CPT372 (S/N: 1WZ1-UP)
HT400 (S/N: 7141-UP)
SBF214 (S/N: CSB1-UP)
SCT673 (S/N: 4TZ1-UP)
SPP101 (S/N: 7151-UP)
SPS342 (S/N: 2LZ1-UP)
SPT342 (S/N: 3CZ1-UP)
SUF557 (S/N: LTF1-UP)
Excavator:
325D (S/N: C7C1-UP; KHX1-UP)
330D (S/N: THX1-UP; THY1-UP)
385B (S/N: BLC1-UP)
Off-Highway Truck:
773D (S/N: 1KR1-UP)
Quarry Truck:
775F (S/N: LJX1-UP)
Petroleum Engine:
3126B PETROLEUM (S/N: Z2A1-UP)
3412E PETROLEUM (S/N: Z2D1-UP)
C-15 PETROLEUM (S/N: Z2C1-UP)
C32 PETROLEUM (S/N: B2C1-UP; SMP1-UP)
Pipelayer:
589 (S/N: 48W1-UP)
Track-Type Tractor:
D10R (S/N: 5JJ1-UP; 80M1-UP)
D11T (S/N: LJW1-UP)
D9R (S/N: 99C1-UP)
Wheel Dozer:
844H (S/N: EHX1-UP)
854K (S/N: H9K1-UP)
Wheel Loader:
966H (S/N: RSX1-UP)
988B (S/N: 48W1-UP)

 

Introduction

Do not perform any procedure in this Special Instruction until you read this information and you understand this information.

This Special Instruction contains a description of the priming pump operation, plus the troubleshooting procedures for the Fuel Priming and Primary Filter Pump Gp and the Fuel Filter Base Assembly. This procedure also provides the proper method of priming the priming pump.

Table 1
Part Numbers  Description Part Numbers  Description
212-3657 Water Separator and Fuel Priming Pump Gp 217-8339 Fuel Filter Base Assembly
190-8977 Water Separator and Fuel Priming Pump Gp 190-8970 Base As
217-6927 Water Separator and Fuel Priming Pump Gp 217-7455 Fuel Filter Base
252-1363 Water Separator and Fuel Priming Pump Gp 247-6050 Fuel Filter Base
213-4740 Water Separator and Fuel Priming Pump Gp 247-6050 Fuel Filter Base
217-8342 Water Separator and Fuel Priming Pump Gp 217-8339 Fuel Filter Base Assembly
235-8725 Water Separator and Fuel Priming Pump Gp 235-8724 Fuel Transfer Pump Base As

The affected part numbers are listed above. The first column in Table 1 lists the reference group part numbers for the applicable serial numbers. The third column in Table 1 lists the part numbers for the base assembly of the reference group.

 

Priming Pump Operation

Note: 235-8725 Fuel Transfer Pump and Filter Gp and the 235-8724 Fuel Transfer Pump Base As are for the continuous flow version of this pump. The applications that use this pump will not have a mechanical transfer pump. These pumps will always be energized when the engine is running.

When the pump is energized the following describes the fuel flow:

 

  • Fuel is drawn from the fuel tank into inlet port (4) .
  • The fuel then flows to the fuel filter and to the water separator, if equipped.
  • The fuel is pressurized after entering the inlet chamber of the pump.
  • The fuel travels out of the number one valve (2), through outlet (3), to the mechanical transfer pump, if equipped.

When the pump is not energized and the engine is running the following describes the fuel flow:

 

  • The fuel is pulled by the mechanical transfer pump through inlet port (4) to the fuel filter and the water separator, if equipped.
  • The fuel then enters the inlet chamber of the pump that exits at the number two valve (1) into the outlet (3) .
  • The mechanical transfer pump creates the negative pressure that opens the number two valve.

 

The Electric Priming Pump Does Not Run (No Sound)

Intermittent electrical problems are sometimes resolved by disconnecting and reconnecting connectors. If the status is changed due to disconnecting and reconnecting a connector, there are several possible reasons. The likely reasons are loose terminals, improperly crimped terminals, moisture, corrosion, and inadequate mating of a connection.

 

  1. Unplug the two pin Deutch connector from the priming pump. Visually inspect each terminal in the connector. Verify that the terminals are not damaged. Verify that the terminals are properly aligned in the connector and verify that the terminals are properly located in the connector.

 

  1. Carefully inspect each wire for signs of abrasion, of nicks, and of cuts.
    • Exposed insulation
    • Rubbing of a wire against the engine
    • Rubbing of a wire against a sharp point

 

  1. Perform the 45 N (10 lb) pull test on each wire. Each terminal and each connector should easily withstand 45 N (10 lb) of tension and each wire should remain in the connector body. This test checks whether the wire was properly crimped in the terminal and whether the terminal was properly inserted into the connector.

 

  1. Use a voltmeter in order to check the voltage at the connector while the priming pump switch is turned to the ON position. Wiggle the wiring during the measurement in order to detect an intermittent problem with the wiring.The voltage is adequate when the voltmeter reads voltage between 20 and 28 V. The voltage is low when the voltmeter has less than 20 V.

 

  1. Reconnect the connector for the priming pump. Ensure that the connectors lock properly. After locking the connectors, ensure that the two halves cannot be pulled apart. Verify that the latch tab of the connector is properly latched. Also verify that the latch tab of the connector returns to the locked position.

 

  1. Try to run the priming pump again. If the priming pump will not run, replace the pump.

 

  1. Verify that the problem has been resolved. Return the original pump for an evaluation.

 

The Pump Runs But the Pump Does not Prime

 

  1. Verify that the fuel tank has fuel.

 

  1. Replace the fuel filter.

 

  1. Remove the fuel filter for the priming pump from the base. Discard the used filter.

 

  1. Clean the base of the filter housing. Make sure that all of the former seal is removed.

 

  1. Lubricate the sealing surface of the new filter with clean diesel fuel.

 

  1. Install the new filter by hand. Tighten the filters until the sealing surface contacts the base. Tighten the filter for an additional 3/4 of a turn.

 

  1. If any repairs were performed on the low-pressure lines verify that all fittings are properly tightened.Note: An air leak could cause the priming pump to malfunction. Also, an air leak will not allow the priming pump to prime the fuel system properly.

 

Purging Air From the Fuel System and Priming the Fuel System


(5) Purge valve

  1. Most priming pumps are equipped with the purge valve (5). Open the valve in order to allow air on the outlet side of the pump to purge out of the low-pressure system. Refer to Illustration 2.


(6) Top outlet fitting or plug

  1. If the system is not equipped with a purge valve, loosen the top outlet fitting (6) on the priming pump. Refer to Illustration 3.Note: Do not loosen the bottom plug. Loosening the bottom plug will not allow the priming pump to prime.

 

  1. With the purge valve and/or the fitting in the OPEN position, activate the priming pump.Normally, fuel will start to flow within two to three minutes after opening the valve and starting the pump.

    Note: The time may vary depending on the distance between the pump and the fuel tank.

 

  1. When fuel starts to come out of the purge valve (5) or of fitting (6), close the valve or tighten the fitting. Continue priming until the system is completely primed.

 

  1. If no fuel comes out of the valve after six or seven minutes of trying this procedure, replace the priming pump.

 

  1. Verify that the problem has been resolved. Return the original pump for an evaluation.

Leave a Reply

Your email address will not be published. Required fields are marked *