Mystery plug under HFCM
More Turbo
Joined: Nov 2004
Posts: 577
Likes: 12
From: Cumming, Iowa
Looking at the breakdown it appears the fuel pump is a component of the HFCM
Here is a question for the Ford tec's here.
When a pump fails do they just replace the pump or is the entire HFCM replaced?
The reason I ask is a coupel of weeks back had mine in to the dealership replaced an injector and replaced the fuel pump for low pressure.
Sorry about the potental
Here is a question for the Ford tec's here.
When a pump fails do they just replace the pump or is the entire HFCM replaced?
The reason I ask is a coupel of weeks back had mine in to the dealership replaced an injector and replaced the fuel pump for low pressure.
Sorry about the potental
Logistics Pro
Joined: Nov 2010
Posts: 3,673
Likes: 6
Looking at the breakdown it appears the fuel pump is a component of the HFCM
Here is a question for the Ford tec's here.
When a pump fails do they just replace the pump or is the entire HFCM replaced?
The reason I ask is a coupel of weeks back had mine in to the dealership replaced an injector and replaced the fuel pump for low pressure.
Sorry about the potental
Here is a question for the Ford tec's here.
When a pump fails do they just replace the pump or is the entire HFCM replaced?
The reason I ask is a coupel of weeks back had mine in to the dealership replaced an injector and replaced the fuel pump for low pressure.
Sorry about the potental
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More Turbo
Joined: Nov 2004
Posts: 577
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From: Cumming, Iowa
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I'm hitting easy street
Joined: Nov 2009
Posts: 6,395
Likes: 27
From: Central Oregon
There was a change by Ford. From the info in the following link, they did away with the heater in 06. If so, and I would say m-chan68 would know, someone changed the manifold and did not put in a new wire harness when they did.
https://www.ford-trucks.com/forums/1...different.html
https://www.ford-trucks.com/forums/1...different.html
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
There was a change by Ford. From the info in the following link, they did away with the heater in 06. If so, and I would say m-chan68 would know, someone changed the manifold and did not put in a new wire harness when they did.
https://www.ford-trucks.com/forums/1...different.html
https://www.ford-trucks.com/forums/1...different.html
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Wow! That thing is filthy! It should be cleaned with some electrical contact cleaner and a soft bristle brush, then massaged with some dielectric grease and covered with a small plastic bag sealed with RTV and placed in another slightly larger bag so the first one don't get wet! 
Lead Driver
Joined: Mar 2010
Posts: 5,505
Likes: 256
From: Woodbridge, Ontario, CA
The OP either had the HFCM manifold or the entire HFCM itself replaced at some point in its life, but the servicing tech that replaced it, failed to install the update 6C3Z-9F759-A harness to go along with it, leaving that connector unplugged.
In answer to IABill's question, I replace the entire HFCM whenever I get them coming to me with low fuel pressure issues rather than just the pump component.
In answer to IABill's question, I replace the entire HFCM whenever I get them coming to me with low fuel pressure issues rather than just the pump component.