Help with part identification.

[FourCorners7.3]

Could someone help me identify this part that is in front of the blower motor and almost right underneath the starter solenoid? When the glow plugs are warming, it makes a very loud buzzing sound and vibrates like crazy. It'll stay on for a while trying to crank over; then it'll turn off after a couple minutes, then it'll crank over just fine.

Thank you.

[belz]

Looks like the vacuum pump.


Sent from my fone.

[yaterman8]

that there would be your vaccum pump