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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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