So I just got my 08 6.4 and after a week of driving it the check engine light came on and then it had a loss of power at around 2300 rpms, is my hpfp going out or is it the frp sensor?? I was monitoring the fuel pressure and its at 24k when you floor it but then when you got to floor it again it's at like 18k then drops to around 8k. Now the weird thing Is that it only dose it In the afternoon after work not in the morning on the way to work which I find weird.

 

If P0088 is the only code you are getting you may have a sticking PCV ( ) in the HPFP.
This could be due to a known mfg. defect

Ford released the following TSB to address.

TSB
11-4-22 6.4L - LACKS POWER - DTC P0088

Publication Date: April 27, 2011

FORD: 2008-2010 , F-350, F-450, F-550


This article supersedes TSB 11-4-15 to update the Service Labor Time Standards.

ISSUE:
Some F-Super Duty 250-550 vehicles equipped with a 6.4L may exhibit a lack of power concern with an intermittent diagnostic trouble code (DTC) P0088; at full operating temperature during moderate to heavy acceleration.

ACTION:
Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

Intermittent P0088 diagnostics:

Check all continues memory DTCs. Is DTC P0088 the only code present?
No - do not continue with this procedure. Refer to the Powertrain Control/Emission Diagnostics (PC/ED) to diagnose this concern.
Yes - continue to Step 2
Replace the (HPP). Refer to Workshop Manual (WSM), Section 303-04C for HPP replacement.
Both the fuel volume control valve (VCV) and fuel pressure control valve (PCV) adaptive learning parameters must be reset after a HPP replacement. Refer to PC/ED, Section 4, Hard Start/No Start Diagnostic Subroutines step 7 to reset adaptive tables.

PART NUMBER PART NAME
8C3Z-9A543-B High Pressure Fuel Pump


OTHER APPLICABLE ARTICLES:
10-20-10

WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

OPERATION DESCRIPTION TIME
110422A 2008-2010 F-Super Duty 6.4L Regular Cab: Check DTCs And Replace the HPP Includes Time For Prior Approval, Remove And Install Cab, And Reset Both VCV And PCV Adaptive Learning (Do Not Use with Any Other Labor Operation Except For Other Applicable TSB Articles) 8.9 Hrs.
110422A 2008-2010 And Crew Cab: Check DTCs And Replace the HPP Includes Time For Prior Approval, Remove And Install Cab, And Reset Both VCV And PCV Adaptive Learning (Do Not Use with Any Other Labor Operation Except For Other Applicable TSB Articles) 9.1 Hrs.

DEALER CODING
BASIC PART NO. CONDITION CODE
9A543 42

 

Also check FRP sensor and harness that is located under passenger side valve cover.

 

So my alternator went out on my truck Friday on the way to work so I had the local shop scan the truck to see what it said about my CEL and the code and he said Frp sensor but I told him I read on here and other places that it was the hpfp like someone said above and provided the tsb. Now the only thing Is that tsb is old the newer one 12-7-7 doesn't mention the replacement of the pump just a reflash from Ford, has anyone tried that and has it worked?? The post I saw was from 13 and I haven't found anything newer on the issue.

I would much rather not throw 3k+ out the window right now if I can help it.