In the engine, it has a fixed displacement pump. The pump moves almost the same CC's per rev at all pressures (internal leakage does increase as the pressure goes up). If the pressure gets too high theres a relief valve in there somewhere downstream of the pump (often on the pump body).
If your pressure sender is before the filter, a higher reading can be caused by a non bypass type filter, a plugged filter, or finer filter media.
If the sender is after the filter, a higher reading means less restriction in the filter.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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