Fuel pressure question

Smokin 6.0

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Jul 17, 2012
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Indiana
On my 05 when I key on the fuel pressure builds quickly to around 65psi truck starts and runs good fuel pressure stays good.. when I shut the truck off the pressure drops to 0psi pretty fast isn’t there something that keeps it from dropping that low ? Like a check or something I don’t ever remember it dropping lower that 10-20psi on my 7.3 when it was off
 
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