fuel system upgrades

[steved]

Steved, can you post a couple plots of your data like I did? I'm curious to see your variations across the life of the truck. There are very few members who keep this kind of data, so I'm always curious to see others' numbers.



And SKing, with all due respect, I don't think RDyson was being disrespectful in any way. You must admit, 25-27 highway MPG is abnormally high. I'm not calling you a liar, I'm just curious how you manage to achieve such remarkable economy. Do you keep a detailed log?



-Ryan

All my data is hand written in a logbook... I don't have the time to enter it in electronically... maybe someday.



steved

 

[RDyson]

SKing, Your sig doesn't say whether you are stock or have any mods on your truck. With my TST/EZ combo, I've had my overhead read as much as 27 mpg. But that is because of the foolin' thats going on. My best mileage ever has been just a shade under 21 hand calculated. That was from Houston to home, 600 miles with a tail wind. My mileage is 18-18. 5 on average and I have the fuel tank vent mod so I know my tank is full on both ends of the trip.

My comments were not meant as a personal attack. Just that I have never heard of that kind of mileage. I am very interested in how you attain it. Mods, driving style, fuel additives. We would all like to be getting those same mpg's.

Thanks, Randy

 

[KSears]

funny how this question of mine about install fuel pump upgrades ,( fass or something similiar) and what problems encountering with things like inner tank fuel pumps and concerns has turned into an argument about fuel mileage, guess I will approach this issue a different way, thanks everyone

 

[steved]

funny how this question of mine about install fuel pump upgrades ,( fass or something similiar) and what problems encountering with things like inner tank fuel pumps and concerns has turned into an argument about fuel mileage, guess I will approach this issue a different way, thanks everyone

I believe you can either leave the intank pump in place (backup) or remove it for an earlier tank module that doesn't have the pump... find the literature on the FASS, it should be out there online and should tell you how involved the process is... the intank pump isn't a "block" like some of the engine mounted LPs...



steved

 

[Foot]

Observed Fuel System Upgrade Benefits with an AirDog

Sorry for the late reply.



I installed an AirDog on my 2003 and have noticed about a hand calculated 1 mpg increase (combined city and highway driving), a smoother idle and a much cleaner stock fuel filter. I have also wired my AirDog with a bypass switch so that I can run the AirDog when refueling and noticed that I can fill the tank to the top of the fuel filler neck with the AirDog is running without any problems (e. g. no vent mods required!).

 

[steved]

Steved, can you post a couple plots of your data like I did? I'm curious to see your variations across the life of the truck. There are very few members who keep this kind of data, so I'm always curious to see others' numbers.



-Ryan

Just going to put this in from today:



Drove 385 miles on 18. 110 gallons (or 21. 25mpg)

No additives.

Average speed was 60mph.

Mixed driving (city, highway mainly, country roads)





Drove an additional 235 miles on 11. 48 gallons (or 20. 50mpg)

No additives.

Average speed was 65mph... all highway with some stop and go (it was storming and multiple accidents)



This includes the following mods:

Rokktech Sensor

Exhaust

New (Paper) airfilter (not a highflow element)

FASS

Dynatrac kit.



Not bad for a 600CTD with 4. 10 rears.



steved

 

[rbattelle]

Wait a minute... with all those other mods how do you know your FASS gave you 5%? The Dynatrac kit alone should be good for 2 or 3% gain in fuel mileage.



I don't calculate partial-tank mileage because I've found it exceptionally unreliable. I once hand-calculated 44 MPG from a partial tank. I don't even pay much attention to the mileage per tankful, because I also find that highly unreliable (I don't have any faith in my own ability to consistently refill the tank to the same level, and even minor changes have a large impact on calculated fuel economy).



It should be obvious at this point that I'm pretty skeptical about the 5% gain from FASS, only because I have yet to see a single bit of data that supports the notion. I'm not calling anyone a liar - far from it. I think people getting 5% gain are genuinely reporting what they've found. Unfortunately, it's not uncommon for people to find precisely what they're looking for.



I have no idea whether the entrained-air removal system in the FASS actually works. Nor am I qualified in any way to pass any judgement whatsoever on the FASS, positive or negative. I have absolutely no data on FASS, and no experience whatsoever with the FASS system. I am, as it were, utterly ignorant of the FASS on a practical basis. I've never even laid eyes on a vehicle equipped with one, much less ever touched a FASS.



The only thing I can say with absolute certainty is that my LP fuel system had absolutely no effect whatsoever on fuel economy. Everything else, including my personal choice not to use a FASS, must be taken as absolute opinion.



So, to answer the question at the beginning of this thread, the best fuel system is the one you decide to purchase after exhaustive personal research.



-Ryan

 

[OHale]

Just going to put this in from today:



Drove 385 miles on 18. 110 gallons (or 21. 25mpg)

No additives.

Average speed was 60mph.

Mixed driving (city, highway mainly, country roads)





Drove an additional 235 miles on 11. 48 gallons (or 20. 50mpg)

No additives.

Average speed was 65mph... all highway with some stop and go (it was storming and multiple accidents)



This includes the following mods:

Rokktech Sensor

Exhaust

New (Paper) airfilter (not a highflow element)

FASS

Dynatrac kit.



Not bad for a 600CTD with 4. 10 rears.



steved

That's pretty much identical to my 600, right down to the Rokktech. I don't have the 4. 10 however, but have been driving 65-72 mph. Keeping the filter changed does make a difference in my mileage. I've found the filter minder isn't the best indicator of when to change the filter. I've gone to just changing it every12K or less. I used the MOPAR paper filter.

 

[steved]

Wait a minute... with all those other mods how do you know your FASS gave you 5%? The Dynatrac kit alone should be good for 2 or 3% gain in fuel mileage.



I don't calculate partial-tank mileage because I've found it exceptionally unreliable. I once hand-calculated 44 MPG from a partial tank. I don't even pay much attention to the mileage per tankful, because I also find that highly unreliable (I don't have any faith in my own ability to consistently refill the tank to the same level, and even minor changes have a large impact on calculated fuel economy).



It should be obvious at this point that I'm pretty skeptical about the 5% gain from FASS, only because I have yet to see a single bit of data that supports the notion. I'm not calling anyone a liar - far from it. I think people getting 5% gain are genuinely reporting what they've found. Unfortunately, it's not uncommon for people to find precisely what they're looking for.



I have no idea whether the entrained-air removal system in the FASS actually works. Nor am I qualified in any way to pass any judgement whatsoever on the FASS, positive or negative. I have absolutely no data on FASS, and no experience whatsoever with the FASS system. I am, as it were, utterly ignorant of the FASS on a practical basis. I've never even laid eyes on a vehicle equipped with one, much less ever touched a FASS.



The only thing I can say with absolute certainty is that my LP fuel system had absolutely no effect whatsoever on fuel economy. Everything else, including my personal choice not to use a FASS, must be taken as absolute opinion.



So, to answer the question at the beginning of this thread, the best fuel system is the one you decide to purchase after exhaustive personal research.



-Ryan

Do you want me to post both before and after the FASS install?? I have seen increases with each and every mod... with each mod I would get a little more... the dynatrac didn't give me that much improvement actually... maybe a single mpg, if that...



The point was I am getting almost as good of mileage as the 2nd gen'rs with a 3rd gen.





steved