I suppose the only downside to owning two (almost) identical cars is that I notice every difference, so I start wondering...

In one car (91 300D), the amount of air in the primary fuel filter is negligible....maybe a half inch if the filter were turned vertically.

In the other car (92 300D), I would say the amount of air is about 1/3 the volume of the filter.

Both cars fun flawlessly.

Why the difference in the size of the air pockets?

I guess this is how I amuse myself when both cars are working perfectly!

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife