Wow I can't imagine where you could sneak in a pump unless it faced forward or maybe ran it off the driveshaft.
Thankfully in autocross even our sweepers appear to be short enough duration that I'm not having an oiling issue - yet! One of these days I've got to get some instrumented readings, with this tire setup I must be exceeding 1.5gs - maybe by a lot! I've not seen the innards but by the car surviving what I do I'd guess the baffling in the pan must be pretty good
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Cheers,
- Jeff