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Dieseljunky2
Dieseljunky2, Ford Mechanic
Category: Ford
Satisfied Customers: 3946
Experience:  ASE Certified, Ford Certified, Cummins Certified, & 20+ years in field experience
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A 05 f650 with a 5.9 cummins-diesel..diesel- fuel..passenger side

Customer Question

i have a 05 f650 with a 5.9 cummins-diesel- fuel transfer issue..replaced transfer pump on passenger side same problem. if i fill the passenger tank to full the gauge reads just the passenger side. will not transfer and ohms were 15-153 on driver sending unit.is that out of range???? i can fill up the driver side to full and it will be there forever. everything electically for the transfer pump is there but it does not come on how can i properly diagnose the issue and not just throw parts at it like the transfer pump and still have th e same issue.
Submitted: 5 years ago.
Category: Ford
Expert:  Dieseljunky2 replied 5 years ago.

Dieseljunky2 :

Hello, here is a diagnostic sheet for your truck, due to problems with system Ford sent oput this quick check sheet for techs to use. Let me know what you find. Thanks

Dieseljunky2 :







FORD:

2004-2008 F-650, F-750

 


This article supersedes TSB 07-9-2 to update the Service Procedure.


ISSUE:


Some 2004-2008 F-Super Duty 650-750 vehicles equipped with dual fuel tanks, may exhibit one tank emptying and the other tank remaining full.


ACTION:


Follow the Service Procedure steps to correct the condition.


SERVICE PROCEDURE


 


On 2004-2007 F-Super Duty 650-750 vehicles the right fuel tank will be empty and fuel does not transfer from the left tank.


On 2008 F-Super Duty 650-750 vehicles the left fuel tank will be empty and fuel does not transfer from the right tank.


TRANSFER PUMP DIAGNOSTICS


 









NOTE:BOTH SENDING UNITS PROVIDE INPUT TO THE FUEL TRANSFER PUMP (MODULE). ONLY ONE SENDER IS ALSO WIRED TO THE INSTRUMENT CLUSTER. THE INTEGRAL MODULE IN THE TRANSFER PUMP CONTROLS THE TRANSFER PUMP OPERATION.

 









NOTE:ON 2004-2007 MODEL YEAR VEHICLES ONLY THE RIGHT SENDER PROVIDES FUEL LEVEL INFORMATION TO THE CLUSTER/GAUGE AND THE FUEL TRANSFER PUMP (MODULE). THE RIGHT TANK FEEDS THE ENGINE FUEL SYSTEM WHILE THE LEFT TANK FEEDS ONLY THE RIGHT TANK TO MAINTAIN EQUAL FUEL LEVELS.

 









NOTE:ON 2008 MODEL YEAR VEHICLES THE LEFT SENDER PROVIDES FUEL LEVEL INFORMATION TO THE CLUSTER/GAUGE AND FUEL TRANSFER PUMP (MODULE). THE LEFT TANK FEEDS THE ENGINE FUEL SYSTEM WHILE THE RIGHT TANK FEEDS ONLY THE LEFT TANK TO MAINTAIN EQUAL FUEL LEVELS.

 


Refer to Wiring Diagram Section 49 for the following diagnostics.


 


At Connector C3264 (2005-2008), C9102a (2004), located at the fuel transfer pump, perform the following:



  1. Verify the voltage on pin-E (pk/bk wire) is battery voltage. If concern is found, repair as necessary and reevaluate transfer pump operation.

  2. Verify pin-D (bk/og wire) has a good ground. If concern is found, repair as necessary and reevaluate transfer pump operation.

  3. Verify the resistance on both sending units pin-A and pin-B are within the range of 15 Ohms empty to 160 Ohms full. If concern is found, repair as necessary and reevaluate transfer pump operation.

  4. With all the connectors connected and the key on engine running (KOER), verify the voltage at alternator (circuit 1818) is 7-7.5 volts. If voltage is outside this range, load test circuit 1818 (wh/bk wire) to ensure wire integrity. If circuit 1818 integrity is verified, and voltage is below the specified range, replace alternator. Refer to Workshop Manual (WSM), Section 414-02.

  5. If no concerns are found with voltage/resistance in steps 1-4, replace the fuel transfer pump. Refer to WSM, Section 310-01.

  6. Verify transfer pump operation by creating a 10 gallon fuel difference, with the right side tank level on 2004-2007 model year and left side tank on 2008 model year being lower. Start the engine and observe fuel transfer pump operation.