Fpr mod and ****ty gas mileage??

[teamcasslake]

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???

[redstroker_2002]

is it maybe winter blend fuel that usually drops a few mpg when u start running that!

[teamcasslake]

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

[strokin_early_99]

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.

[teamcasslake]

i think my drain valve might be leaking but im not sure. where did u find leaks at if u can remember???

[CHUCK]

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!!!

[DJM]

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.

[strokin_early_99]

Originally Posted by DJM

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

[DJM]

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.

[sttstroke]

can you tell a differance with the mod power wise?