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Weird pressure fluctuation above 150# cold

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Morkai

Morkai the Red
Joined
Nov 24, 2002
Messages
295
I noticed since swapping pumps, when it's not good and hot it will fluctuate wildly once it hits about 150psi. I'm talking about needle swings as large as 200-300 psi depending on how much throttle. Also noticed it didn't do it when I shifted into manual 1 or 2. Is the pump cavitating?

Unlike my other pump, this one seems to give good boost pressure, I've seen 250psi before it heats up good, and 180-200+ when it's nice and hot WOT. This is an older art carr non lockup pump and 3000 stall.
 
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