Dave,
I didn't mean to imply that the 2nd fuel pump would rupture the
diaphragm in the mechanical pump, only that in the event that the
diaphragm did rupture there would be a serious problem. And I don't
think it can be stressed too strongly that only low pressure pumps
should be used with SU carbs. What I wrote wasn't directed at you. I
work in IT user support and I am used to the fact that no matter how
many times you state the obvious, there is going to be someone who
doesn't get it.
Charles
Dave and Liz DuBois wrote:
> 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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