[T3] Electric fuel pump on a 66 Fastback with carbies.
Jim Adney
jadney at vwtype3.org
Sat Oct 29 20:51:35 PDT 2016
If the electric pumps you can find have significant forward flow
resistance, you'll need to do something more complicated. That would
require a couple of Tees and a free-flowing check valve, in addition
to the electric pump and switch.
On 29 Oct 2016 at 20:13, Jim Adney wrote:
> 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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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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