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Re: [T3] Fuel leaking into my oil.

On 11 Jun 2005 at 9:51, Regis Loeser wrote:

> I've got a '68 Fastback that leaks gas into the crankcase.  Other than
> that it seems to run perfectly fine.  From what I understand a 68
> doesn't have a cold start so I figured the gas must be coming from a
> leaky fuel injector. 

The most common problem with these old FI systems is that the voltage regulator 
gets worn out and the system voltage drops. Low system voltage makes the FI run 
rich, and this generally leads to poor gas mileage, gas in the oil, and, 
eventually, poor engine performance.

Connect a voltmeter across the battery and watch the voltage as you run the 
engine up in rpm. The voltage should rise with increasing rpm up to a point, 
and the level off. The leveling off point is the system regulating voltage, 
controlled by the voltage regulator.

If the system regulating voltage is less than 13.5V, replace the VR with a 
genuine Bosch 30-019. This is a cheap fix for what amounts to a very simple 

With a properly operating charging system the voltage should be 14.1-14.4V. I 
see problems as soon as the regulating voltage falls below 13.5V.

BTW, I just had my one remaining type 4 owner over here this morning and he had 
the same problem. His system regulating voltage was  13.3V. He had replaced his 
VR with a cheap replacement from JC Whitney and the voltage with the new 
replacement was 13.3V, which is still worthless. Buy decent parts and it can 
often make your life simpler.

Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA

List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org

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