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Volkswagen Repair/super beetle won't run

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Expert: Rick O. - 1/29/2009


Question
Hi, my super beetle (1978) doesn't seem to want to run. I turn the ignition, it starts right up, sounds fine for a couple seconds, and unless I keep the throttle revved , it dies immediately. My first guess was a vacuum leak, but I haven't got a clue how to investigate to verify this, much less fix it. Any ideas?
Thanks, Eric

Answer

T1_FI_Engine
Eric,
 I believe the fuel pump switch is misadjusted or the air flap is binding, both are inside the air flow meter.  See here for an explanation of the circuit:

http://www.type2.com/bartnik/afm.htm

The setup shown is for a Type 2 (Bus), similar, but not quite the same as your Beetle.

In the attached picture, #4 is the connector on the air flow meter which passes the fuel pump switch signal.

Rick

Rick O.

Expertise

Classic, aircooled (rear engine) 1949-1979 VW's, specializing in electrical problems, fuel injection, and Type 181 "The Thing". NOTE: I have limited experience on water-cooled VWs (Rabbit, Golf, Jetta, etc...) but I am glad to help to the extent of my knowledge, due to the fact there are currently no other experts registered for these models.

Experience

15 years of aircooled VW ownership and maintenance.

Publications
Wikipedia, VW Beetle

Education/Credentials
Retired US military Electronics Tech/Master Training Specialist, Civilian Computer engineer.

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