FASS. Increase in Mileage???

[MMeilicke]

My 4. 5 has 80,000 miles on it and I am thinking of replacing the fuel transfer pump with the FASS system. FASS says that one would see and increase in fuel mileage. For those of you who installed the FASS, have you seen an increase in fuel mileage as if so how much?



Thanks

 

[JH8128]

before most of my mods I installed a FASS and did not notice any increased mileage. They claim that it does and I don't doubt that, how much i don't know. It does make some since, when you remove the air from the fuel that would theoretically give better fuel mileage.

 

[steved]

Probably does, just not measureable...

Adding the FASS did make a difference in performance in my truck... not sure about mileage.

 

[daytripper63]

Probably does, just not measureable...



Adding the FASS did make a difference in performance in my truck... not sure about mileage.

Ditto to that

 

[CAPN Harley]

upper readout

Well I did notice that the upper readout went off the charts when I put it on my 01. It showed that I was getting close to 28 mpg Oo. but checking by hand calculation it did go up about 1 mpg to 22 mpg. Wish I could get that out of my 06. :{