Charles,
The pump that I recommend in my article on permanently installed back up
pumps is the low pressure Facet pump. This pump puts out a pressure
(2.5 - 4 PSI) that is the equivalent of the SU high pressure pump (2.7
or 3.8 PSI). This is a reasonable pump to use even with a TD that uses
a low pressure SU pump (1.5 PSI) because it is being installed
underneath the car, at the back by the fuel tank. In this position it
is necessary to have a pump with a higher pressure than used in a car
where the pump is mounted in the engine compartment and is located above
the level of the carburetors.
My article only deals with cars that use electric SU fuel pumps and I
have no opinion on cars with mechanical pump as I have no experience
with them. What I do know, is that Burlen Fuel Systems (makers of all
things SU) does have 2 different models of mechanical pumps, which like
the electric pumps have only check valves in them, so there would be
little chance of the back up pump causing the diaphragm to rupture.
That said, your caveat regarding the mechanical pump is certainly
something to take into consideration.
Cheers,
Dave
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