Rich,
My first thought about the fluctuating fuel pressure is the quality of
the
fuel; ethanol base that "thins" as it gets hotter.
Gary Pavlovich
----- Original Message -----
From: "Rich Kinsley" <rlkinsley@xxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Thursday, August 06, 2009 7:30 AM
Subject: Interesting discovery
>
>
>
> Rich Kinsley '64 Dodge Polara 4dr 318poly w/goodies
>
> Last night at cruise night I ran across a young man with a very nice
> '66
> Ford running a 429 dual-quad engine. He has the same fuel pump and the
> same pressure regulator, Holley blue pump and Holley reg.. He is
> running
> a return line to his tank which is the only difference. He is having
> the
> exact same issue that I am right now. When cold the pressure is right
> on
> 6.5psi. As the engine warms the pressure begins to drop off and later
> winds up about 3psi. If you reset it the pressure will be 7.5 or higher
> when it's cold again. I tried another same model pressure regulator
> that
> I have with the same results. This is the regulator that came with the
> pump.
>
> I'm thinking the spring or ?? in the PReg is changing with the temp
> from
> the heat??? I will test this theory by installing a plastic milk bottle
> around the PReg after the pressure drops and filling it with ice. If
> the
> pressure rises I suspect the PReg is too hot and is the culprit. Maybe
> there is a different style PReg or at least I can insulate it.
>
> The young man's car is also exhibiting the occasional dying and hard
> starting that I have experienced. He suspects the coil. Dejavue.
>
> I was also told last night that a guy said the MSD and Accel coils must
> be installed vertically or they will overheat. Mine is angled downward
> about 30deg and does get hot. I can spin it vertical and see if that
> helps too.
>
> Whadda ya think???
>
>
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