Fpr mod and ****ty gas mileage?? - Ford Powerstroke Diesel Forum
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  #1  
Old 12-23-2007, 06:41 PM
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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???
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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!
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Old 12-23-2007, 07:07 PM
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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
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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.
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Old 12-24-2007, 07:10 PM
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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???
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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!!!
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Old 12-24-2007, 11:20 PM
DJM DJM is offline
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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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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
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Old 12-25-2007, 10:28 AM
DJM DJM is offline
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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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Old 12-25-2007, 03:20 PM
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can you tell a differance with the mod power wise?
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