I don't know about pricing since I've had my FASS for a year and a half or so, but I will say this, even if both systems get you the FP you looking for, look at the installation and see which one you think you would like to do. JMHO

 

I would guess the price difference is because not everybody would look in both places.
If you just buy the components, you will save at least another $100. I priced it all out and all the necessary parts are less than $200. Which makes the gerotor setup just $60 more than a stock replacement. Well, you have to put in more effort into installation, but for performance oriented folks, who cares. This is what it is all about!
-P

 

Did a little investigating and here's what I found.

The wide open diesel kit comes with a Walbro GSL 392 pump. It also comes with the strainer that GDP charges $13.00 more for. It also comes with an adjustable bypass regulator. Price $299

The Glacier Diesel cheaper kit comes with a Walbro GSL 391 pump. You have to buy the $13.00 strainer to not void the warranty. Also the bypass regulator looks to be non-ajustable. Price $399. (The $409 kit comes with the Walbro GSL 392 pump.)

The difference doesn't make much sense. The first kit seems to have better parts and more parts, but is $100 less? Is there something i'm missing? If not, when my lift pump dies, I'll be getting the Wide Open Diesel kit.

 

Your not missing anything. Another good point of the Wide Open Diesel Kit is it comes with Biodiesel compatible hose that is made by parker.

 

I have the BD pump have had no problems with it im getting plenty of fuel around 24psi because i got the kit with the oil psi switch and ran it inline with the stocker. I just couldnt afford the FASS yet. At $250 its a good less expensive way to get the fuel.