Originally Posted by rikadoo
Good morning VANWILL, so im VERY interested in what you discovered with your problem, a couple days ago I just ordered my FASS pump and after this coming Holiday will be installing it. I had decided to just remove my primary filter and replace it with the FASS system like you did. Having read several posts from others on this website it sounds like it should be no problem. Im taking this approach first cause the limited room in which to work around the engine, (standing on my head for hours on end makes the world look funny when I stand back up) When you said it would run ok then bellow black smoke it sounds like you may have had a sticking open injector or some type of fuel pressure regulator issue. either way im really interested in what you found.
My problem had nothing to do with the FASS system, and would likely have occurred with or without me having installed the FASS system. My problem was an ECM failure, which occurred AFTER installing the FASS system.
I believe the FASS (or competitive system) is a good upgrade for CAPS pump-type systems. I have never been comfortable with not "pre-filling" fuel filters until I installed the system. I also installed a fuel pressure gage at the same time, so when I install a filter without "pre-filling" I get to see on the pressure gage whether it primed correctly.
Yes, I know the "lift pump" is supposed to fill a dry filter. But as I always say, the reason to pre-fill filters is that if your lift pump is working correctly, your engine will PROBABLY
start with a dry filter. If you pre-fill the filter, it WILL
start, regardless the condition of the lift pump.
Yes, I installed my FASS system in place of the primary fuel filter. So I now have a 25 micron primary and 10 micron secondary on the FASS unit itself, before it pushes fuel through a 2 micron final filter. When I see fuel pressure drop (at the inlet of the CAPS pump) under WOT conditions, I know it is time to change filters. It is usually the very first filter (25 micron) that is contaminated.