[T3] Loses Power After Running

David Hall dave at hallvw.clara.co.uk
Fri Sep 10 01:21:53 PDT 2021

There have been fuel starvation problems when the fuel tank cap is a non breathing type, causing a partial vacuum to develop in the tank.  Try loosening the cap next time it happens to check it’s not that. 
Dave Hall
UK VW Type 3 and 4 Club

> On 10 Sep 2021, at 04:53, jadney at vwtype3.org wrote:
> On 10 Sep 2021 at 0:41, Tony Rongey wrote:
>> I'm kind of wondering about the fuel delivery.  The coil is also suspect,
>> because it was pretty hot after running.  It's blue coil which seems to be a
>> hit or miss kind of thing.  I have an old black Bosch that I'll try this
>> weekend, but it's untested so it might not help.
> The OE Bosch black coils have been incredibly reliable. The Bosch Blue Coils, not so much, 
> although I've always assumed that the German ones must have been good.
> I'm thinking fuel delivery, too. If you don't have a low pressure gauge, it should be possible 
> to make a manometer with a branch in the line from the pump to the carbs. If the branch is 
> clear plastic, you can measure the vertical height that the pressure can push the gas up the 
> tube.
> A very quick & dirty calculation predicts that 3.5 psi should push gasoline up about 5.2 feet. 
> It will go proportionally higher if the pressure is more than 3.5. This will not be easy to do, so 
> it's probably easier to find a cheap gauge. My gauge for this would be a cheap J C Whitney 
> gas pressure/manifold vacuum gauge.
> If you measure the pressure, either way, don't worry about the actual number. The point will 
> be to compare the pressure that you have when running well with the pressure when the 
> engine gets weak. They should be the same. If they're not, you've probably found your 
> problem.
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
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