> It depends entirely on which of the two Holly Regulators you
> use.
Definitely important to get the right regulator.
> I think that the
> one that comes
> with the blue Holly pump is the higher pressure regulator
> that is designed
> to be set for much higher presures than what we use.
Right. It's advertised for 4.5 - 9 psi. For a SU, ZS or Weber carb, you
want the 1-4 psi version.
> I did hust that when Iwas running the blue pump with twin
> Weber DCOEs on a
> Spit engine and except for the one time when Iforgot to turn
> on the pump
> before a run, I have never expenced any problems wit the setup.
Since the Holley "blue" pump puts out nearly 14 psi, that's a perfect
example of the kind of setup I was talking about. However, for the street,
motor-driven fuel pumps also need a bypass line back to the tank. Otherwise
the fuel in the pump may overheat under no/low flow conditions, leading to
erratic fuel pressure & mixture.
BTW, the Holley "blue" pump is also available without the (wrong) pressure
regulator, P/N 12-812. Kind of overkill for the street, though, IMO; unless
you're really getting over 250 hp out of your Triumph.
Randall
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