[T3] Electric fuel pump on a 66 Fastback with carbies.

[Jim Adney]

On 30 Oct 2016 at 8:09, Ross G Clarke wrote:

> I am in favour of using a small "push button" switch to activate the
> electric pump to prime going to the non active manual pump. This would
> have the float bowls ready for starting and the manual pump take over
> on the crank of the starter motor. 

That would be my choice also, but it will work ONLY if the electric 
pump has nearly zero resistance to flow forward when it's not 
powered. It all depends on how sensitive the internal valving is on 
those pumps, and I don't know what they look like inside. The way to 
check is to simply blow thru it in the forward direction. If air can 
pass forward with minimal resistance, it should work. (Note that the 
first time you do this with a new pump the check valves may be 
sticky.)  

The extra pressure should not be a problem since you're only 
energizing the electric pump for a few seconds before trying to start 
the engine.  

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