|
On 10/31/2014 8:09 AM, Ernest Christley
wrote:
>But...Didn't you mention 6psi fuel pressure?
If that's correct, then why have a return line at
all? If it's a carb engine,
>just use Facet 'solid state' (interrupter
style) pumps. No return line needed.
Good point, Charlie, but the engine came with one of
those AeroVee carbs on it. It's basically a throttle
body with a drip feed for fuel. It gets upset with more
that 2psi of pressure, and there are very few regulators
that are accurate down that low. They're basically
designed to be gravity fed, and the 601XL doesn't have a
header tank.
I'm now seriously considering the transfer pump
configuration. Now that I've been reminded, I remember
that Tracy has been flying with that setup for years.
I've got to think about it more.
But what can you use for a bypass style regulator that's accurate at
2 psi, anyway?
Facet makes cube ('solid state') pumps rated as low as 2.0 psi max.
Here's a list; the window scrolls for more models.
http://www.facet-purolator.com/cube-fuel-pumps.php
That page mentions 'optional check valve' (CV) but doesn't explain
the PSO column. That's basically a 'positive shutoff' or anti-siphon
that prevents fuel from flowing through the pump if it's not
running. Whether you want that depends on how you plumb the
installation. 2 in parallel, you could potentially eliminate valves.
2 in series, twice the pressure but no flow unless both are running.
The .pdf link in the page has a better description.
|