Old mechanic, when I tested it cold, I only put it at 16PSI. That 30PSI is when the engine got hot while I had it plugged in. It was at 0Psi when I started the hot test.
Oh also, I tested for that, I pumped it to 16psi and let it drop to ~8 twice when it was cold, then had my brother start the car. No rough running, no steam, nothing.
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