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Originally Posted by turboICE
The switch is sensitive to heat, is it in a hot area?
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Not particularly, no
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A quick way to test the switch functioning (but not the pressure to trigger) would be to put an ohm meter across the two terminals, in its normal state the resistance should be low to zero. ..
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Did that, also ignition on/ pressure switch disconnected: the pump ran.
Very noisy - is it supposed to be so noisy? Gee...
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BTW - what are you using as the pressure reference for your switch?
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The boost gauge.
I can hear (and feel) the pump running, it vibrates big time!
I played with the screw a bit, and it was set from the factory at around 1 bar, depsite the documentation saying it was set at 10psi!