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I had essentially the same thing happen when I was running
my 13B on a test stand. A heavy duty plastic marine (outboard motor)
fuel can vent was sitting 24" below the EFI high pressure pumps. One
day I was running the engine and notice it was beginning to act like it was
leaning out - I finally notice that the red plastic tank was sucked almost flat
as I had forgotten to open its vent.
So those EFI pumps WILL suck fuel just fine - HOWEVER, if
you have the tiniest air leak - it will suck air much better than that heavy
fuel. So while the pumps can suck fine under the right conditions, it is
much better to have them pushing the fuel. If you have a tiny leak with a
pushing pump, you may get some tiny amount of fuel leaking but your engine will
likely not quit.
Personally, having had two incidents with fire, I prefer
NO leaks - fuel or brake fluid.
Ed
----- Original Message -----
Sent: Wednesday, March 07, 2007 9:08
PM
Subject: [FlyRotary] Fuel tank vent
While I was ground testing my motor setup, I used a six gallon
plastic outboard motor tank. It held enough fuel to run wide open for
about one half hour.
My fuel pump was a little square "ticker" pump,
that produced three psi.
One day I forgot to open the tank vent ( a
little knob), I ran that tank dry, and collapsed the tank into the ugliest
ball of plastic you have ever seen. It was smaller than a basketball.
So the worry is, will my tank vent get plugged? I have
stainless steel screen over mine, to keep the bugs out, and point it into the
airstream to help the fuel flow out of the tank. It doesn't need much
air.
George Graham
Sarasota Florida
Mazda RX7 EZ
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