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 - It's Alright Where It Is! - by Anthony West. I have a tale of a different kind to tell. Whilst rooting in the hedge bottoms this week I had cause to visit Chapel lane Farm, the home of an eccentric gentleman by the name of Austin Kendall. I had heard rumours that an old Case Model C was languishing away in the back of one of the outbuildings there. So off I went in search of what would turn out to be a very rare and unusual tractor. Mr Kendall is an excitable chap to say the least. He is amongst the last of a dying breed of farmer who
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