Air compressor problem

Compressor gets its air from the Boost ?? You got me there!

 

( creak of hood hinges, click of flashlight, author goes investigating . . . )

 

Many engines have the compressor inlet coming from the intake manifold. So under boost, the compressor gets boost pressure at the inlet. With denser air at the inlet, the compressor can fill the tanks faster.

 

Makes sense. Thanks!

 

1st you should check for air leaks. You wont see gauge pressure drop if the leaks are on the supply side. Check that air is not coming out of the dryer purge valve when it's trying to charge. Check the compressor unloader(s). Any oil in the wet tank?

 

You can check if your compressor is not worn. Build air and look dash gauge how fast its building. It should build in 40 seconds Between 85-100psi.
But first thing check air leaks(air lines, fittings, dryer valve) second disconnect air compressor air outlet, start engine if its not building air your unloader valve bad.