Tomster
Beware of idiots
I've never seen that on any of my 350s. Where you begin the troubleshooting is up to you. By chance did you buy an extended warranty?Yeah the needle fluctuates back and forth as the RPMs rise when I'm not really hard on the throttle. Like the needle rises as expected when acceleration starts, but once it hits ~100+psi, I can see the needle drop slightly, then rise back up, etc. Getting harder into the throttle seems to steady it at around 100psi.
Could this be the relief valve in the pump? Pressure rises enough to open the spring a bit, it drops slightly as the relief opens, rises as it closes, etc etc.
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