How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Ron Your Own Question
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 35627
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
7276279
Type Your Ford Question Here...
Ron is online now
A new question is answered every 9 seconds

I have 2008 ford f250 superduty 5.4,I lost ground going to

This answer was rated:

I have 2008 ford f250 superduty 5.4,I lost ground going to fuel pump
JA: Have you ever replaced the fuel pump, or is this the original?
Customer: Original
JA: Are you fixing your F250 yourself? What have you tried so far?
Customer: I changed fuel pump driver module
JA: Anything else you want the mechanic to know before I connect you?
Customer: I jumped green wire with blue tracer with white tracer fuel pump kicks on and runs but then I get p0191 and p0462 code

Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

Do you have a good ground to the FPDM at pin #3 (blue/gray ) wire?

Customer: replied 4 months ago.
No

The Blue/Gray wire at FPDM (pin 3)is the dedicated ground for the FPDM, grounding to the driver side of the frame at G401, near the carbon canister. Have you check it to see if the connection is clean and tight at the frame?

Customer: replied 4 months ago.
I just ran a wire off the frame to the blue wire now I have a ground

Okay dose the fuel pump now engage with the key on and engine cranking?

Customer: replied 4 months ago.
No the fuel pump does not kick on

Okay you are going to need to go back and recheck the circuit to the FPDM and out of it to the fuel pump. I have enclosed the steps in the link below so you can do this.

https://dl.dropboxusercontent.com/u/104923897/Fuel%20pump%20Apr%2017.pdf

Also see the Fuel pump wiring diagrams for testing reference in these link. Have a look and see if this will help you get this resolved.

https://dl.dropboxusercontent.com/u/104923897/FP%201%20Apr%2017.pdf

https://dl.dropboxusercontent.com/u/104923897/FP%202%20Apr%2017.pdf

Customer: replied 4 months ago.
I tested for power at the fuel pump driver module and I have no power at the violet/white wire
Customer: replied 4 months ago.
Cancel that I have power forgot to turn key on

That power come from the fuel pump relay so yes the key dose need to be on So if you have power now then your okay on that wire.

Customer: replied 4 months ago.
I tested everything at fpdm everything looks ok,I did ground out the white/brown wire at fpdm fuelpump kicks on

Are you sure you do not have a defect FPDM?

Customer: replied 4 months ago.
I hope not I just bought it,is there a way to test it to see if it's good?

If you have power and ground into it then there really is not other reason why it will not turn the pump . I would run back through the steps once more just to be sure you did not overlook something.

Customer: replied 4 months ago.
At the fuelpump connector which wires are for power/ ground for pump and power/ ground for fuel gauge

The yellow/green id the power feed to the pump out of the FPDM and the ground.

See the fuel gauge circuit in the link below. The sending unit wires at the pump are the yellow/violet and the green/blue.

https://dl.dropboxusercontent.com/u/104923897/Fuel%20sender%20Apr%2017.pdf

Customer: replied 4 months ago.
Ok going to check that out after lunch, now if the fpdm is bad would that make code p0462?

The code P0462 indicates a problem with the fuel gauge and or the sending unit and dose not affect the Fuel pump or the driver module.

Customer: replied 4 months ago.
The fuel pump relay, which fuse panel it it located in? Under hood or right kick panel

On your F 250 its located in the under hood panel. See the diagram in the link below.

https://dl.dropboxusercontent.com/u/104923897/fuel%20pump%20relay%20APR%2017.pdf

Customer: replied 4 months ago.
Ok I changed fpdm seems to be working good now checking fuel gauge, testing power at fuelpump connector I have power at the white/ brown and yellow/grey wire nothing at green/ orange yellow at brown wire

The sending unit wires are the green/brown (signal return) and the yellow /violet signal out. In most cases this code you are getting set due to a failed fuel tank sending unit.

Customer: replied 4 months ago.
Should either one of them have a power or ground

The signal in ware will have a low voltage reading.

See the pinpoint test steps in the link below. Start your testing at test A 1.

https://dl.dropboxusercontent.com/u/104923897/Pinpoint%20test%20A%20Apr%2017.pdf

Customer: replied 4 months ago.
I have low voltage at the yellow/violet wire nothing on the green/brown

That in most cases means the sending unit has failed.

Customer: replied 4 months ago.
Can you just change the sending unit for the gauge or do you have get the whole thing

You can just replace the sending unit.

You can also check the resistance reading on it as well to verify it has failed. . The sending unit should indicate a reading of between 10 ohms (full tank) and 180 ohms (empty tank). If the resistance is out of range low or high, replace the sending unit assembly.

Ron and 4 other Ford Specialists are ready to help you
Customer: replied 3 months ago.
Sorry about the delayed response but ty for all your help,I gave you a five star rating

Your very welcome and thank you as well.

Customer: replied 3 months ago.
Hey Ron I am trying to check the fuel gauge test but somehow I cant find the diagram for it, can you send it to me again

Related Ford Questions