got a 95 gpm fass pump on my truck. no problems in 2 years. the last couple of days i have heard a strange sound coming from the pump. besides the normal fass whining sound, i am getting a sound that sounds like a vibration/howling . i grabbed the fass unit to make sure the mount had not come loose- it is fine. the pump is not hot or even warm (outside temp 60 degrees-truck just went 30 miles) i do not know the psi the unit is putting out. i am in between gauges! ( had problems with the last brand. i have not put in my new ones yet ) i am concerned because i have a 500 mile trip to take this weekend! any ideas?

 

any ideas?