FASS question
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Posting Guru
Joined: Aug 2009
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From: ellensburg
FASS question
so i've been reading up a lot about these fuel air separators, but unfortunately I havent been able to find anything about what exactly they do better than removing air from fuel. How do I tell if i'm having an issue of air in my fuel? Apparently all diesels suffer from this, but it seems like a lot of it is hype. Are these things reallly worth it?
as a side note, not sure if its related, but it seems like when i get under a half tank, and especially under a quarter or a tank, the engine is sluggish, if not down right losing power. is this a common issue?
thanks for any advice
as a side note, not sure if its related, but it seems like when i get under a half tank, and especially under a quarter or a tank, the engine is sluggish, if not down right losing power. is this a common issue?
thanks for any advice
Senior User
Joined: Nov 2004
Posts: 399
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From: Draper, Utah
it is a very common issue. the fitting that hook to the fuel tank start to leak and then suck air because they are under suction. also the return fuel line goes into the tank and goes into a mixing chamber. then the fuel gets sucked out of this chamber. alot of air comes from the return line there for you are getting air from the return line plus air from the leaking tank fittings.
read and do this mod it will be very cheap thing to do and all but cure the air in the fuel problem on our trucks. the Fass and air dog systems are overkill in my opinion for just a standard truck like most of us run.
http://www.guzzle7pt3.com/hutch.php
By the way this mod is called the hutch mod.
read and do this mod it will be very cheap thing to do and all but cure the air in the fuel problem on our trucks. the Fass and air dog systems are overkill in my opinion for just a standard truck like most of us run.
http://www.guzzle7pt3.com/hutch.php
By the way this mod is called the hutch mod.
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Posting Guru
Joined: Aug 2009
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From: ellensburg
yea I noticed that airdog is cheaper...i'm going back to college and play baseball, so my days of having time to work on the truck are slowly going down. want to get pretty much all my major stuff taken care of before winter...how easy is the install on the air dog? are they a must have item if they can be afforded? or is it more of a convience item? this truck has never seen a winter with snow (bought it in ca, been a ca truck its entire life) but I go to school in Washington State, so i'm trying to get it prepped to not get too beat down by snow...
would you spend the money/time on the FASS (or other such thing) or spend less money and more time on powder coating the frame and exposed panels underneath the truck...fortunately I potentially have access to a shop with the powdercoating stuff, so all I would be paying for on the powder coating would be the actual material, no labor costs. Basically i'm trying to figure out whether a FASS type system is really worth the 500 or so dollars...is it really going to improve my gas milage? I wont be driving very many miles, however every bit counts. I can justify spending the money if it will end up paying for itself in money saved over the a certain period of time..
would you spend the money/time on the FASS (or other such thing) or spend less money and more time on powder coating the frame and exposed panels underneath the truck...fortunately I potentially have access to a shop with the powdercoating stuff, so all I would be paying for on the powder coating would be the actual material, no labor costs. Basically i'm trying to figure out whether a FASS type system is really worth the 500 or so dollars...is it really going to improve my gas milage? I wont be driving very many miles, however every bit counts. I can justify spending the money if it will end up paying for itself in money saved over the a certain period of time..
Cargo Master
Joined: Apr 2009
Posts: 2,135
Likes: 0
From: Man Cave
it is a very common issue. the fitting that hook to the fuel tank start to leak and then suck air because they are under suction. also the return fuel line goes into the tank and goes into a mixing chamber. then the fuel gets sucked out of this chamber. alot of air comes from the return line there for you are getting air from the return line plus air from the leaking tank fittings.
read and do this mod it will be very cheap thing to do and all but cure the air in the fuel problem on our trucks. the Fass and air dog systems are overkill in my opinion for just a standard truck like most of us run.
http://www.guzzle7pt3.com/hutch.php
By the way this mod is called the hutch mod.
read and do this mod it will be very cheap thing to do and all but cure the air in the fuel problem on our trucks. the Fass and air dog systems are overkill in my opinion for just a standard truck like most of us run.
http://www.guzzle7pt3.com/hutch.php
By the way this mod is called the hutch mod.
X2 on this one, Do the Hutch mod m8. I still cant believe how good this mod is. The motor is super quite, the pedal response is awesome and Im just about through my second tank of fuel which will confirm Im getting better mpg's. (dont know why on that one). Oh, I also put in the pre pump filter.
Senior User
Joined: Nov 2004
Posts: 399
Likes: 0
From: Draper, Utah
yea I noticed that airdog is cheaper...i'm going back to college and play baseball, so my days of having time to work on the truck are slowly going down. want to get pretty much all my major stuff taken care of before winter...how easy is the install on the air dog? are they a must have item if they can be afforded? or is it more of a convience item? this truck has never seen a winter with snow (bought it in ca, been a ca truck its entire life) but I go to school in Washington State, so i'm trying to get it prepped to not get too beat down by snow...
would you spend the money/time on the FASS (or other such thing) or spend less money and more time on powder coating the frame and exposed panels underneath the truck...fortunately I potentially have access to a shop with the powdercoating stuff, so all I would be paying for on the powder coating would be the actual material, no labor costs. Basically i'm trying to figure out whether a FASS type system is really worth the 500 or so dollars...is it really going to improve my gas milage? I wont be driving very many miles, however every bit counts. I can justify spending the money if it will end up paying for itself in money saved over the a certain period of time..
would you spend the money/time on the FASS (or other such thing) or spend less money and more time on powder coating the frame and exposed panels underneath the truck...fortunately I potentially have access to a shop with the powdercoating stuff, so all I would be paying for on the powder coating would be the actual material, no labor costs. Basically i'm trying to figure out whether a FASS type system is really worth the 500 or so dollars...is it really going to improve my gas milage? I wont be driving very many miles, however every bit counts. I can justify spending the money if it will end up paying for itself in money saved over the a certain period of time..
