Fuel Pressure for 06 5.4L - F150online Forums



Fuel Pressure for 06 5.4L

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  #1  
Old 02-26-2009, 11:29 AM
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Fuel Pressure for 06 5.4L

Did a search and came up empty handed. Anyone know what the fuel pump discharge pressure prior to the filter is supposed to be as well as the rail pressure? My pump sounds kind of weak, even after the filter change but I don't want to drop $400 for no reason. If I had a tuner I could see the rail pressure but i'll probably just hook a gauge prior to the filter if anyone know what it's supposed to be.
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Old 02-26-2009, 01:40 PM
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Sounds weak huh.....define sounding weak. Are you having any driveability problems?

I should be able to get you a number though, check back after 4:30ish....
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  #3  
Old 02-26-2009, 03:59 PM
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When I turn the key over and the pump primes, it's not a loud whining sound like it used to be. It's more like a slow oscillating sound. The only time i'm having problems is when my truck is warmed up and I go WOT, it spits and sputters. I changed the filter the other day and same problem. I just don't want to go into the plugs/coils if it is fuel related.
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  #4  
Old 02-26-2009, 06:30 PM
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Gotcha.

KOEO-35-45 PSI
KOER-28-45 PSI
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  #5  
Old 02-27-2009, 09:02 AM
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Quote:
Originally Posted by Bartak1 View Post
Gotcha.

KOEO-35-45 PSI
KOER-28-45 PSI

Thanks, but what does the KOEO & KOER mean?
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Old 02-27-2009, 10:15 AM
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Quote:
Originally Posted by dihlon View Post
thanks, but what does the koeo & koer mean?

koeo = key on / engine off
koer = key on / engine running
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Old 02-27-2009, 01:17 PM
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Thanks alot guys.
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  #8  
Old 09-19-2011, 03:41 PM
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Similar problem

Have an 06' F150 5.4L Triton with low fuel pressure

starting engine fuel pressure 40-60psi
engine running fuel pressure 20-30psi
(increases to 30psi when accelerating)

-changed fuel filter
-changed fuel pump
-changed fuel pressure sensor
-changed fuel pump voltage regulator
-no air/vacuum leaks
-no codes
-reseated fuel system wiring connection beneath drivers door

Help, Ideas?
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  #9  
Old 09-19-2011, 07:48 PM
glc
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Fuel pump voltage regulator? Do you mean the FPDM?
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  #10  
Old 09-20-2011, 11:13 AM
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Yes I mean the FPDM, (fuel pump driver module).
Don't have any restrictions in the fuel lines.
Vehicle starts and runs, but runs rough and bogs down
under any acceleration.

Last edited by Britt02; 09-20-2011 at 11:17 AM.
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  #11  
Old 09-20-2011, 06:39 PM
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Your fuel pressures look like there within tolerance. What's your battery voltage when running? The fact that you don't have any codes is strange. Maybe something is wrong with your throttle body. You could pull the air intake and check to make sure the butterfly on the throttle body is opening as expected when you romp on it. Sounds like its getting lots of fuel and no air if it is bogging down. If there was air and no fuel you would also bog but probably would get a lean code but maybe not, either way I would make sure the drive by wire throttle body is working before doing anything else, easy to eliminate it as a possible issue.
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  #12  
Old 09-21-2011, 09:01 AM
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Thanks, I'll check the voltage and Throttle Body, will double check the codes too.
The fuel pressure is being monitored just past the fuel filter with an inline 'T'.
The pressure runs 20psi at idle and increases to ~30psi with acceleration. At start up it
jumps to 40-60psi.
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