Which systems in engine bay use check valves?

[MarkIII4Me]

I have a FFIM and I need to know where to use 1 way check valves. It appears that I'm missing several. I want to retain all factory provisions while minimizing all possible boost leaks.

Is a check valve needed between the FFIM and the line that runs to the power steering pump? Does the pps system work on positive pressure, vacuum or both?

Also figure one is needed to the heater control valve. It works only on vacuum, correct?

I think it'd be a good idea to compile a list of all check valves in the engine bay and if they are one way or have crack pressures.

Shoot me some answers people.

 

[BoostMonger]

Don't forget the brake master. Probably the most important one

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[MarkIII4Me]

I know of that one. I really need to know about the heater valve and PPS tho.

 

[CyFi6]

Yes the heater valve uses a check valve located right near the valve itself.

 

[MarkIII4Me]

Cool. What about the valve on the the power steering pump that has a vacuum line running from the intake manifold and another to the intake pipe?

 

[CyFi6]

Nope, no check valve there.

 

[3p141592654]

not needed either unless you run full steering lock under boost! :biglaugh: