1990 johnson 150 gt queastion

[TimmyC]

Just wondering if someone can tell me the purpose of the vacuum switch. I was needing to know what kind of problems it may cause?

 

[jonesg]

Re: 1990 johnson 150 gt queastion

ISn't that part of the VRO ? the pump is vac driven so if its funky I'd replace.
It probably regulates the pump....or triggers the alarm.

 

[emdsapmgr]

Re: 1990 johnson 150 gt queastion

The vacuum switch measures the suction of the fuel system. If the fuel system suction raises to a certain point, it sets off an alarm like an overheat. A high vacuum warning would indicate a fuel line restriction. The switch is set at 7 hg +/- 1/2.