Fass or Not

[Wild and Free]

Have you seen them tucked up on the bed bolt where they are supposed to be mounted?  I wouldn't be scared to put one there. Also, the fass has larger filters so it can flow a higher volume at a given pressure without as bad of flow drop like the airdog will have

If one is maintaining the pressure it is set at volume of flow means nothing. Pressure = resistance to flow, one can have a pump that is capable of 1000gpg but if it only needs to supply 14 psi what good is it?

 

I have been going to hydraulics classes for 25 years and the old school thought of teaching flow flow flow has been thrown out long ago where flow meters were the norm and flow was taught extensively, now I think most flow meters have long since been thrown away as all the science in the world can not overcome the simplicity of pressure being a result of resistance to flow, no pressure = you have a major leak, pressure regulating issues causing a bypass or return or pump issues not supplying enough flow.

[Mopar1973Man]

Major pressure drop (greater than 5 PSI) while operating is a sign of weak lift pump. Most or less the demand volume of the engine is out weighing the supply volume of the lift pump. Like my setup I idle at 17 PSI and 15 PSI at WOT. This is a sign your pump is keeping up with the demand. 

[Dieselfuture]

I like my new FASS and where it's located, it's completely covered with box and you cant see it from out side. Also I don't know if I would put it in the box it self, because it would be above fuel tank and will have to work harder, when it's below tank fuel gravity flows to pump and then pump pushes it forward.   

[Wild and Free]

I like my new FASS and where it's located, it's completely covered with box and you cant see it from out side. Also I don't know if I would put it in the box it self, because it would be above fuel tank and will have to work harder, when it's below tank fuel gravity flows to pump and then pump pushes it forward.   

 

If you are using the tank module there is no gravity at work here at all, the pump has to "pull" it through the in tank module unless you are running a bottom tank sump which you need to cut a hole in the bottom of the tank to accommodate.

[Dieselfuture]

If you are using the tank module there is no gravity at work here at all, the pump has to "pull" it through the in tank module unless you are running a bottom tank sump which you need to cut a hole in the bottom of the tank to accommodate.

Not to argue with you but You ever siphon gas out of any car or truck? If the line is in the tank and primed and full of fuel and the other end is below upper level of fuel in tank it will come out. Done it many times, that's part of the reason I have ball valves on inlet and return to my fuel basket, that way when I unscrew the filters all I do is close both valves and fuel stays in the tank and not all over me.

[Mopar1973Man]

Exactly. Like for me to change out the filters on my truck I got to clamp off the supply hose because the siphon effect of the loaded fuel system. What you need to remember is to stay within the abilities of the pump. All pumps will lift fluid X amount of distance. As long as it not outside that your fine. Like in our case you can't be above the frame level because there is a body in the way. Even with the idea of being in the fender area you can rise much more than a few inches to tuck the pump and filters.

 

DieselFuture's setup is what I would like to have in the my future fuel system. But I would hit a wrecking yard and get the 1994-1996 fender skirts. Then hide all that stuff in one whack!

[Dieselfuture]

Exactly. Like for me to change out the filters on my truck I got to clamp off the supply hose because the siphon effect of the loaded fuel system. What you need to remember is to stay within the abilities of the pump. All pumps will lift fluid X amount of distance. As long as it not outside that your fine. Like in our case you can't be above the frame level because there is a body in the way. Even with the idea of being in the fender area you can rise much more than a few inches to tuck the pump and filters.

DieselFuture's setup is what I would like to have in the my future fuel system. But I would hit a wrecking yard and get the 1994-1996 fender skirts. Then hide all that stuff in one whack!

I like the whole tub idea out older truck, I had some aluminum old signs from work and that's what I made my cover from.

Ever sience I've done my module mod I had no regrets so far works great, key is, in and out in 1/2" and keep it only 1/2" of the bottom otherwise it will foam if you just dump return line in basket it's got to be low to bottom. I did some bucket tests with it before finally realizing that diesel fuel foams if just dumped in.

[pepsi71ocean]

Bought my fass 95 back in 2008 e with about 65,000 miles on it, and about more idling with it.

My fass looks like the one in the picture, the red kind. I'm happy I got.