Fpr mod and ****ty gas mileage?? - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 12-23-2007, 06:41 PM Thread Starter
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Fpr mod and ****ty gas mileage??

i did the fuel pressure regulator mod and my gas mileage went from like 15.0 to like 10.5. i didnt change anything but the FPR mod and it went down like crazy.

thinking about taking the shim out.

has anybody else experienced this or am i the odd ball???

2005 F-350 Crew Cab long Bed-
100% Nozzles(70hp supposedly)
SCT X3-DP Tuner Tunes, 60TOW,80ECON,120HP(DD)
Magnaflow 4" straight piped
AFE stage 2
River City EGR delete
GoodYear duratracs
Pioneer AVH-P4300DVD
Kicker ZX350.4
Rockford Punch 6x8"s
Kicker ZX500.1
2 Rockford Punch 10"s
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post #2 of 17 Old 12-23-2007, 06:57 PM
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is it maybe winter blend fuel that usually drops a few mpg when u start running that!

-Josh

2008 2500 LMM- Deleted, Blocked, Fueled, & Tuned by:
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post #3 of 17 Old 12-23-2007, 07:07 PM Thread Starter
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i was getting 15 with the additives in it and i had a half tank did the mod and like the next time i took my truck out it just like went down. i mean my truck seems to idle better, better throttle response and stuff but dang my mrg's drooped by like 3 to 4

2005 F-350 Crew Cab long Bed-
100% Nozzles(70hp supposedly)
SCT X3-DP Tuner Tunes, 60TOW,80ECON,120HP(DD)
Magnaflow 4" straight piped
AFE stage 2
River City EGR delete
GoodYear duratracs
Pioneer AVH-P4300DVD
Kicker ZX350.4
Rockford Punch 6x8"s
Kicker ZX500.1
2 Rockford Punch 10"s
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post #4 of 17 Old 12-23-2007, 08:32 PM
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Never herd of that happening in the last 5 years I have been recommending shimming the FPR.

Do you have any fuel leaks from the higher pressure? When I did mine in 2000, I found two leaks from the added pressure.

Early 99 (Born on 11-20-98) F350 CC LWB 4X4
north of 480hp and south of 13.7sec
Bored with current setup

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post #5 of 17 Old 12-24-2007, 07:10 PM Thread Starter
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i think my drain valve might be leaking but im not sure. where did u find leaks at if u can remember???

2005 F-350 Crew Cab long Bed-
100% Nozzles(70hp supposedly)
SCT X3-DP Tuner Tunes, 60TOW,80ECON,120HP(DD)
Magnaflow 4" straight piped
AFE stage 2
River City EGR delete
GoodYear duratracs
Pioneer AVH-P4300DVD
Kicker ZX350.4
Rockford Punch 6x8"s
Kicker ZX500.1
2 Rockford Punch 10"s
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post #6 of 17 Old 12-24-2007, 07:21 PM
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I found two causes of my issue with poor fuel mileage, 1. my foot gets to heavy when the light turns green. 2. fuel drain valve leaking. I fixed the leaking drain valve, cant seem to fix the 1st problem though!!!

Chuck
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post #7 of 17 Old 12-24-2007, 11:20 PM
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SO it's ok to do this mod with a chip right? I have a 100hp chip wich is probably actually 75hp just don't want to be breaking anything else.
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post #8 of 17 Old 12-25-2007, 09:35 AM
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Quote:
Originally Posted by DJM View Post
SO it's ok to do this mod with a chip right? I have a 100hp chip wich is probably actually 75hp just don't want to be breaking anything else.
The simple answer is yes. But you need to think about the question. You have a chip that tells the truck to add more fuel. By increasing the fuel demand the fuel supply needs to be available. As far as breaking stuff, I have not broken anything yet and I sled pull as well as drag race with as high as 28psi on the launch. These trucks are tough. The weak link is the transmission!

Merry Christmas

Early 99 (Born on 11-20-98) F350 CC LWB 4X4
north of 480hp and south of 13.7sec
Bored with current setup

Sled Pull and Drag Racing Videos

<><
Family of 5 saved by Grace.....

Sponsored by Left Coast Diesel in Concord, Ca

Anything BUT Conservative Performance
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post #9 of 17 Old 12-25-2007, 10:28 AM
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Well if your talking about getting the fuel as far as how much the fuel pump can handle I have a Fass pump just havn't got around to installing it yet or were you talking more in the case of the injectors? And yea I have already found that the tranny is the weak link I pretty much toasted it when I got it towed home I drained the fluid and it was dark red and very shiny. Thats been upgrade though. Merry Christmas to you too.
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post #10 of 17 Old 12-25-2007, 03:20 PM
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can you tell a differance with the mod power wise?

1999.5 6 Speed
Tony Wildman 6 Pos Chip
AEM Intake
4'' Exhaust
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