Vacuum Primer Test To test for a worn or damaged primer in the maintenance shop, isolate the primer by disconnecting the vacuum primer/fire pump tubing connection at the vacuum priming pump.

The vacuum pump is actually made up of two parts: The pump assembly and vacuum-pump bearing housing. Once the two 13mm bolts that hold the two elements together are removed, a light tap with a ...

Dominic Colletti discusses fire pump accessories: they may not be glamorous, but priming systems are critical to pump drafting performance.