One of the big topics on here was going to an Fass or Air Dog fuel pump, especially on the 8.3 cummins with caps injection.
I just finally purchase the pump and noticed that some of those pumps come with an old style filter and others with a new style filter. I wondered why they changed filters?
There are some you tube videos, from Fass, describing the reasons, which brings up some concerns.
First I came across a You Tube video by Truck Master saying how bad the new fass filters are.
The complaint is over the new water separator and the way it works. It absorbs the water in the filter material and will clog up and shut down fuel flow to protect your engine, no matter where you are. Some are claiming it clogs and blows the pump fuse. There is no water drain on the bottom like on the old filters.
So why did they change the filters?
FASS just released their new particulate & water separator filters! However, what does it all mean? The new particulate filter is rated @ 144 microns. The 144-micron particulate filter on the suction side will drastically reduce cavitation, increase flow properties, lower the sound output of the FASS
It seems the majority of these pumps are being put on pickup trucks and they must have had noise complaints. So they made a new pump called the whisper titanium pump. This appears to be a mechanical change in the pump motor connection and the smoothing of the ports to reduce noise.
Then they appear to have gone to a new filter that is really only a 144 micron screen which cuts the noise down further.
For someone owing a diesel pusher we are not that concerned about noise, we are more concerned on getting the best protection possible.
The 144 micron is only to protect the pump. After the pump the next filter does two things. Water and 2 micron fuel filter. It is a rather small canister not like what I have now.
They indicate the filter can handle 4 oz of water before clogging up. I don't know if that is a lot of water for a 100 gallon fuel tank. I assume you are not always going to get water but sooner or later it could happen.
On the you tube site Truck Master he is recommending Cat filters. We don't know the credibility of this person I am only putting this out there to get some feed back and learn from others that have all ready installed the system.
So after all this research and thinking I am wondering about another problem.
This involves the claim of fuel polishing and it's benefit. Maybe someone that has one of these pumps installed can help out with my thinking on this.
I bought the Fass model 100 gallons per hour pump. When you hook it up it is going to circulate the fuel from the tank and through the pump and then back to the tank. If the engine is operating then a certain amount goes to the engine at a regulated pressure. So if I turn on the ignition and the pump starts, is it circulating 100 gallons an hour? The filters that are on the pump are only rated for 25 gph. How can you have a 100 gph pump running through 25 gph filters?
Remember this; The 144-micron particulate filter on the suction side will drastically reduce cavitation, increase flow properties, lower the sound output of the FASS
If we are worried about flow properties why are we putting a 25 gph filter on a 100 gph pump?
I could buy a Racor fuel water separator for marine use that is $169 dollars. But it only handles 45gph. So I would need two of them in parallel for the Fass pump. Obviously if I was just feeding the engine with no return or polishing that would be plenty, but the polishing and built in return from the pump itself should require 100 ghp to handle the pump. Sounds crazy so I must be off base. But where?
The other concern is if you want to aerate a fluid you could pump it from a tank and then spray it into the air above the tank. When you put the hose kit on and feed the output of the pump into the filler neck it seems that you are adding air not removing it. There is just air at the top of the tank and the pump sprays the fuel into this.
Also in polishing the fuel where does this extra air go? I could see if there was some sort of bleed valve on the pump that constantly belched out air that would make sense. But just pumping fuel around and spraying it into air doesn't seem to be a way to reduce air in the fuel.
When we talk about removing air I would expect the excess air to go somewhere.
Or is it that when you apply suction to a fluid and pull it 36 feet you pull entrapped air out of the fluid and the pump has some sort of diverter /diversion thing that sends fuel loaded with air back to the tank and the engine only sees clean fuel. That sounds reasonable but then why do you need to polish it at all. Just run the pump and it takes the air out of only the fuel going to the engine but not out of the whole tank as they claim?
I am getting read to install the system but am hung up now on the filters and placement of the pump.
I am also wondering why this isn't some simple deal of just adding a better pump. The filter change seems to be creating all sorts of doubt about this system. If the water separator clogs you will reduce the flow to your CAP system and damage it. If the filter clogs maybe the pump fuse blows before you damage your Cap pump, but depending on where you are that seems inconvenient.
After writing all this I think the best solution is to put on the Cat filters. These are supposedly the Cat numbers; 1R-0750 for the filter and 175-2949 for separator. That is what some of the you tube commenters are saying, check first. There is another name mentioned and that is Donalson. The Cat equivalent is Donaldson Lube Filter Spin-on Full Flow- P550920, This filter only cost 11 bucks yet it is mentioned often.
Here is a link to the cat filter story.
And I don't sell Cat filters or get any money I am just trying to mention that there could be problems with the new Fass water separator and mesh filter setup.
And I have called some of these Fass distributors and also fass itself but they don't seem to have any interest in answering questions.