Michael:
With more pressure, fuel flows faster. The needle valves don't shut off like a
switch. It's a gradual closing until off, so a pressure change will change
the amount that gets past the valve before it is fully 'off'. So, more or less
fuel in the bowl. On my car, I use the lower pressure Holley regulator with
excellent results set at 2 psi. The main pump is a Carter that produces 8psi,
I think it is. I made no changes to the float level from where it was with the
stock pump.
Jim
1957 MGA #311
-----Original Message-----
From: Awgertoo@aol.com
Subj: [Vintage-race] Holley fuel regulator adjustment
Date: Wed Mar 26, 2008 5:33 pm
Size: 1K
To: vintage-race@autox.team.net, VRG_NewsGroup@yahoogroups.com
I recently purchased a Holley Blue fuel pump to replace the Facet cube I
have on my Elva which has an MGA 1500 engine w/two HS6 SU's. The pump came
with
the 4.5-9 psi regulator which I have plumbed up to the carbs using a Y-block
with a pressure guage installed in a 3rd-outlet.
I know that SU's supposedly like 2-4 psi but several folks have told me that
they have had good results with this pump/regulator combo and have been able
to adjust the regulator's flow down to 4.5 or so psi without any
overpressure problems on their SU's, and that the high pressure regulator is
better than
the 1-4 psi Holley regulator. I hope I have made the right selection here.
I'm using AN6 lines from the fuel cell to the regulator with a 3/8" nipple to
the block and then 5/16" lines from the Y-block to the carbs,
In any case I am a bit confused by the Holley instructions which state:
"Any change made in fuel pressure will change the fuel bowl float level
requirements. A readjustment in fuel bowl levels will be required for proper
operation of the fuel system."
Assuming I am able to adjust the pressure down to where it does not
overwhelm the needle valves in the float bowls I do not understand why I will
need to
adjust the float bowl level. I thought that on SU's that is pretty much a
fixed thing.
Can someone shed some light here?
Thanks in advance--Michael Oritt
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