MLishego@aol.com wrote:
> Question of the day:
> I have one of those neat chrome-plated fuel pressure regulators that Moss
> sells for $60. They claim that, on a weber, it will "reduce high-end fade."
> If I throw that baby in there, what will happen? I don't imagine that I'm
> pushing in more fuel than necessary, since the old SU's ran fine, without a
> fuel overflow. I didn't pay anything for the part, so I won't feel bad if
> y'all tell me to feed it to my cat...
> ~Mike Lishego
Mike -
High end fade implies a lack of fuel at wide open throttle. This would
imply a fuel pump unable to provide enough volume at WOT. In order for
the neat chrome-plated fuel pressure regulator to have any effect, you
would need to increase the volume/pressure provided by the fuel pump.
The regulator limits (reduces) the pressure feeding the carb. That
said, I do have one on the regulators on my '79B that has a Weber 32/36
downdraft. I had to put it on because I bought one of the solid state
pumps that Moss and Vicky Brit both sell. The original SU pump had been
replaced by a PO with some other aftermarket pump that put more fuel on
the ground than it did to the carb (cracked housing on the pump). Well,
the solid state pump had too much pressure for the Weber (measured 5
PSI) and over ran the float chamber. So, I bought the regulator and
reduced the pressure to 2 PSI - all is well. Chassis dyno tests show
strong running up to 6200 rpm at 110 mph with no fade. Now, don't buy
these items from any catalog vendor. Both items have the Purolator name
on them, and you can find them at Pep Boys or Autozone or your friendly
local auto parts store for about _half_ what the catalog price is.
(Voice of experience here - I paid the catalog price first, then found
them in the store.)
Wayne Kube
'79B
Plano, TX
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