> Getting ready to replace the mechanical pump on my TR4A and I
> found this low
> pressure electric pump at Pegasus Racing. 1.25 to 1.75 PSI at 20 GPH,
> anybody see a reason that it won't work with a pair of SU's on my 4A?
> http://www.pegasusautoracing.com/ProductDetails.asp?RecId=2698
Pressure seems a bit low, but it's probably OK for a stock motor. However,
a Facet 40105 will work as well, has a pressure rating closer to the
original pump, and costs a whole lot less.
http://www.aircraftspruce.com/catalog/eppages/facetpumps.php
Also available at any parts store that caters to old VW bugs, as this is a
popular upgrade for them too.
At the moment both my Stag (with ZS carbs) and my project TR3 (with H6 SU)
have the 40105 and it works very well in both places. I picked up both of
them used, on eBay, for about 1/2 the Aircraft Spruce price. But I still
plan to convert back to the original mechanical on the TR3. If you go
electric, you should really incorporate devices to kill the pump in case of
a serious accident and/or if the engine is not turning. The electric pump
on the Stag hydrolocked the motor a few months ago, when I forgot to turn
the ignition off (after doing some electrical troubleshooting) and had float
valve with a slow leak.
FWIW, I also used one to replace the original electric pump on my Onan
genset, and it worked perfectly there, too.
Randall
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