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If you leave the key on, you should settle near 30-35psi. I have a 255 and elec. gauge and on key-on it goes from 0-50+ and settles at 30psi. When I turn the key off, it does bleed off fast, it's already 25psi by 1 minute, but eventually holds above 20 for my setup (mainly stock).

sounds like a bad pump, i.e. it will not hold the pressure well.

--C
 
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