My 1991 420SSEL sometimes loses, then regains power at highway speed. It loses power, then needs to be restarted at slow speed. I bought a fuel filter, thinking I'd be able to easily find and replace it like on my 1969 Lincoln. Not so easy. Where is it? I found a similar looking cylinder flanked by two smaller cylinders by the passenger side rear axle shaft. I don't want to start disassembling things until I know what I'm looking at. Is that the fuel filter or is that part of the air suspension system?

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1991 560SEL (254K miles)
1980 Lincoln Mark VI - Givenchy
1979 Lincoln Mark V Collector's Series
1979 Lincoln Town Car Collector's Series
1979 Ford "Effie" Pickup (in gradual transformation to a show/street truck)
1969 Lincoln Mark III (waiting for "Overhaulin" to call)
1989 Lincoln Towncar
2001 Lexus GS300 (spousal unit's daily driver)