FASS vs. Preporator, same truck same day same dyno.

[RonA]

I am taking the FASS off my truck so I can go back to a mechanical pump. I just had a pleasant call from the Preporator guy. Told me about the advantages of his over the FASS. So here it is. If someone out there has a Preporator and wants to do a same day compare of the two, I will send the FASS for the experiment. I haven't seen where it has been done, and quite honestly I am getting tired of reading about seat of the pants hp impressions. If one is better than the other, great. If they're both the same, then post it and move on with the fuel thing. While you're at it test the RASP at the same time. I'd be glad to donate the thing just to cut through the baloney.

Ron

 

[Cooker]

Ron, what are the differences between the two? Thanks.

 

[RonA]

The FASS is red, the Preporator is blue. The red one costs one kidney, the blue one costs two. Other than that I'm not sure.

Ron

 

[Cooker]

I thought from your conversation with the gentleman from Preporator that you might be a little more in tune with what some of the differences are. No worries, I did a little searching on the forums from the time I asked my original question and I came up with some answers. Thanks.

 

[RonA]

I told you what I know for a fact. I have been told a number of things. I have only run this motor with a FASS system. I have nothing to compare it to. I have seen people post that they thought it ran better only to see no change in mileage or dyno readings. Some people have a hard time admitting that their new 600 dollar gotta have didn't change a thing. Personally I'd like to see a head to head comparison done by someone who has nothing to gain.

RonA

 

[Tcolesanti]

I'm with RonA!!!

 

[Nickaru]

Seems like everyone is looking for horsepower gains with everything item they put on their truck. I know they claim these pumps will give you a little more, but I bought my FASS because we all know about the lift pump failure problems and the FASS does away with that. My FASS gave me 15 PSI at the pump, it's reliable and I don't have to worry about another lift pump going bad. I even noticed a difference in the idle noise after the install, it's smoother and quieter. I didn't care about the "HORSEPOWER" factor. I've seen others just complain about "I'm on lift pump number 5 with 60,000 miles on my truck!" Why beat a dead horse? Replace it with something that works for reliability not horsepower, and there are several solutions out their including the FASS. I'm happy with the unit and so is my VP44. Just my $0. 02.

 

[Big MAK]

What Nickaru said. It works; so I'm happy. Expecting HP from a fuel pump strikes me as silly; other then having the stock pump run dry. No fuel certainly would cause a HP problem.



But if they advertise HP gains then that's probably why it comes up.



My FASS only has a couple thousand on it but I'm very happy with it so far. 13 to 15 lbs pressure depending on conditions.

 

[Tcolesanti]

The fact is there is no power gains from using one or the other. What is beating a dead horse is people saying that one is better than the other. How do you effectively tell the difference between two products that do virtually the exact same thing??? Just like RonA said: One is blue and one is red.

 

[Nickaru]

Well, they came from the same design, Father and Son, now they are hashing it out. Both units are similar, so it can't be exactly the same and then the Airdog is all new.

According to Brad with FASS, when you remove the entrained air in the fuel, your injection timing is corrected and that may net your additional power. It sure made a difference in my idle..... smooth. So I know it must be better than just an after market pusher pump.

 

[RonA]

I'm afraid you guys are all missing the point. These things are not advertised as a fuel pump. They are a Fuel Air Separator System. That is my point. If it is just a fuel pump, fine. Call it a fuel pump and don't tell me it is suppossed to give me an increase in hp and torque. They probably do what they claim, but 600 to 1000 dollars is alot of money for just a pump. Nobody knows for sure what in the heck they really do. TDR should start a section where they test new products and give the results before the products are advertised in the magazine. I would gladly pay more for my subscription if I knew that anything advertised in it was tested and approved.

RonA

 

[Lucas5477]

Nice point RonA.



Lucas

 

[mcoleman]

I'm with Nickaru. My truck runs much quieter with less timing noise which means that it is removing air and I can make 470hp without my fuel pressure guage taking a dive. All of the aftermarket pusher pumps have been failing so far the FASS and Air Dogs have not. That price also includes all new fuel lines and fittings for a complete system.

 

[Nickaru]

"According to Brad with FASS, when you remove the entrained air in the fuel, your injection timing is corrected and that may net your additional power. It sure made a difference in my idle..... smooth. So I know it must be better than just an after market pusher pump. "



I do get the point, as I stated earlier in the post, I know it's doing something for the fuel because a regular pusher pump won't smooth an idle out and make it quieter. But why are people thinking that because it's doing more than pushing fuel, it should give you more power? Injection timing correction? And you probably get a little more efficiency (power) from that. Price for these units are a little steep, but when you look at a regular pusher pump some are using and running lines, relays, etc, you'll start to creep up to the price of those Fuel Air Separators. Mine works. :-laf

 

[Michael Gibson]

Just a couple of random thoughts from an outsider here. If all either one does is replace the lift pump and smooth out the idle by removing the air; is that so bad? Especially when you consider that replacing seveal lift pumps puts you right up there with the price of admission for these systems. Plus what if your next lift pump takes out your injection pump? Warranties are good things but they don't last forever

 

[RonA]

For those of you who perhaps do not get that magazine that comes with your right to post on this fine web site I offer the following. From the 42nd issue of Turbo Diesel Register, page 61, bottom half of page. And I now quote" Delivering, Consistant performance, MORE POWER (20+ HP), increased fuel economy, better throttle response, quicker starts, less cab noise,lower turbo temperatures, consistent/evenfuel flow to injection pump, consistent/exact fuel injection timing. " I'm sorry, I guess I have no right to ask if anyone has tested to see if it does anything other than just move fuel from point A to point B.

RonA

 

[willyslover]

Ron . . same SH** different day heck yes you can ask if one is doing more/less in HP



once someone has $$ invested their objectivity takes a leap out the window and they start to "protect" their position/purchas,

those that are posting that they are happy... GREAT



to quote "I will send the FASS for the experiment". . nice offer Ron



wonder how many guys have a shelf full O "stuff" that they replaced with something else[I know I do]. . anyone that has been around bombing for a while sure has... so a side by side would be nice to see for those that are trying to get off the fence as to which one they want to go with. . nothing more nothing less A TEST

 

[Murle]

I've been running the FASS for over a year now. Would not trade it for anything. I bought it for reliability. Same way about the CaTHER. Don't knock them till you try them.....

 

[mcoleman]

And I would have to say my Air Dog does everything advertised in that ad except for adding 20hp. Plus it makes 18psi and stays at 18psi even under full throttle with my combo. The engine is much quieter so says the CFO even. Riding in the truck would never give you the idea of what lies underneath the surface. It's quieter and more refined than it was stock. I will spend the money again when I trade the wifes car in on her an 03 up truck. It will probably be the 2nd mod after guages.

 

[RonA]

Well I guess if nobody cares, then buy what you want. They are both great fuel pumps. It was rude of me to question the written word.

RonA