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Hi Scott and Porter,
I choose to use a 10 or even 30 micron filter on the Racor followed by the Volvo secondary filter which is 2 micron I believe.
In my opinion by having the pre-filter at 2 micron you are in effect only having one filter. So in the event of major contamination the Racor will plug and the engine will suffer from fuel starvation. You may also damage the fuel pump, although on the 54 the fuel is gravity fed from the tank to the filters.
The same principle applies to the water maker. There is a course filter followed by the fine filter. You can not just go straight to the fine.
I know this is a controversial subject but that is my opinion….and the industry norm.
Amelia AML 54-019
I understand. We have the same setup. The dual racor (A vs B) and A+B if one wishes. We keep the 2 micron on both A and B and use only A or B, switching back and forth. Filter C is of course the very pricey Volvo-specific filter/fuel water separator, which is what I want to spare by using the 2 micron. I watch the pressure gauge on the racors a lot. That’s why we change frequently, to keep pressures low. We have no pre-pre filters.
I remember a thread on this about a year ago, the 2 micron pre-filter argument. That’s when we switched. Its hard to be scientific when we have limited data re what works “best.”
Great comments on why to keep the tank full during storage.
I have the two racor filter setup. I consider this the primary filter / pre-filter.
1) FilterA only
2) FilterB only
3) FilterA and FilterB in parallel
Do you run the 2 micron filters here?
On my D3-110C there's a Volvo spin-on filter (2 micron) on the engine itself. We'll call that FilterC
Did you install a pre-filter before the Racors??
2007 A54 #69