Ballin on abudget

It's a airdog 2 165 and I filled out my bio

so I had time to tinker around I can hear it near the. Back of the engine I put my hands on the fuel lines and one set was vibrating really bad hmm I'm stumped

The oil level is fine !! And do I check the oil pressure at the port on top of the oil filter ? And what are the symptoms of a spun bearing ?

Ok truck has 330,000 miles started noticing a howling noise at idle it's really pronounced at the oil pan when driving it only makes the noise when it's in gear between 1000-1500 rpm the noise is more pronounced when cold and not as bad when the motor is warmed up any help would be greatly appreciated !!