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Turbo charge air overpressure switch 700 1989

posted by  Brick Skinner on  Mon Mar 7 10:44 CST 2016
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last visit: Fri Jun 13 13:31 CST 2014
[RELATED]

This is a Hobbs switch located just above the brake pedal.

Problem; When I punch my turbo hard for more than a few seconds the power falls flat in its face and I'm left with only enough power to get off the road but the engine doesn't die. The only way to clear it is to switch the engine off and restart. Then everything is fine until I punch it hard again.

No! It's not collapsed or blown or leaking hoses! I've triple checked all of that.

Apparently however there is this switch that shuts down fuel during over-boost as a protection for something.

What I really need to know is; what components get shut down? Is it one or both fuel pumps? And, is it normally necessary to restart the engine to clear the condition? That is, why not just release the gas peddle and let the system reset that way?

Thanks
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