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Volkswagen Air-Cooled VW: 1952-1979 71 Beetle fuel cut-ff switch diagnosis

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Last Post: Mar 1, 2012 8:22 PM Last Post By: FKH161
runner109

Posts: 1
Registered: 03/01/12
71 Beetle fuel cut-ff switch diagnosis
Posted: Mar 1, 2012 5:08 PM
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Hello! Out there. I need to know how to check and diagnos the fuel cut-off switch. and also what are
symptoms that the switch is bad.
FKH161

Posts: 7,531
Registered: 12/29/05
Re: 71 Beetle fuel cut-ff switch diagnosis
Posted: Mar 1, 2012 6:51 PM   in response to: runner109 in response to: runner109
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Stuck closed, no idle.

Stuck open, possible run-on on shut down (hot engine, needs ignition source from hot carbon).

Remove solenoid, hold body to ground, apply power to connector end.

  • solenoid needs to click every time power is applied
  • look at tip of solenoid
  • you should see a plunger move (through the little port holes) every time the solenoid is energized.
  • open passage when energized, restricted passage when not
FKH161

Posts: 7,531
Registered: 12/29/05
Re: 71 Beetle fuel cut-ff switch diagnosis
Posted: Mar 1, 2012 7:49 PM   in response to: FKH161 in response to: FKH161
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Sorry, I may have been thinking old style solenoid... if your solenoid has a plunger with no housing around it, the plunger just needs to move. Basically same operation... I can post pics of different styles later.
FKH161

Posts: 7,531
Registered: 12/29/05
Re: 71 Beetle fuel cut-ff switch diagnosis
Posted: Mar 1, 2012 8:22 PM   in response to: FKH161 in response to: FKH161
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Attachment valve.jpg (166.8 KB)
Picture of two styles attached...
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