i put the guage on and it read 48psi when running (spec is 44-54psi) but after i shut it off i waited 5 minutes and read the guage and it dropped down to 10 psi, i was told this is normal? seems to me like it means the check valve is bad? if thats normal what else would be making it crank longer before starting?

WHEN THE ROAD ENDS, THE FUN BEGINS

97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs