I run a FASS
95gph with the filters. IMO don't buy a fass
unless you are getting the unit with the filters because it offers better filtration than the stock set up. If you are going to run a standalone pump just run a holley pump or something of that nature. As for Fass
Vs. Airdog. Its honestly a father son thing, the father started airdog for semi's over 20 years ago and his son branched off and did FASS
. The Air dog runs 1/2" fuel lines where as the FASS
only runs 3/8". The air dog also has smaller filters that don't hang down so low, however that just means less filter material and you will have to change them more often. They are also really close in price so that doesn't make much difference. I would recommend looking at the walbro system from GDP, its excellent components, except they aren't in a nice package like the fass
. They tend to get strung out along the frame. If you're shooting for 500hp you should get the 150/150 fass
IMO. I have talked to a really reputable source, the vendor I bought my fass
from and he said that a 95/150 would support up to 550hp on fuel, but you may want to be on the safe side and just go with the 150gph. The 150 costs the same, but you will need to change the intank pickup tube to supply enough fuel.
hope this helps a little.
And from personal experience, I love my fass
. 2 years almost 40k on it without a single problem with it. You may encounter problems if your VP has been exposed to 5psi or less fuel pressure.