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If your fuel filters are located after the high pressure pumps, and are
oriented horizontally, then there is a place for air to reside, and act as a
‘spring’ when the fuel pumps are turned off, resulting in a short run-on.
Whenever I remove the gascolator bowl to check the screen for contamination, I
end up introducing some air into the system, that gets trapped in the fuel
filter case, causing run-on. I get the run on until that air gets gradually
purged by fuel circulation.
Bill
Schertz
KIS Cruiser #4045
N343BS
Phase I testing
Sent: Friday, January 07, 2011 8:28 AM
Subject: [FlyRotary] Re: NOTICE !!!! Engine run-on with fuel pumps
off!
A
lot of rubber hose in the fuel system will store a bit of pressure after pumps
off. Doesn't take much (or any) pressure depending on how rich you
are running at idle. Remember, at idle the engine is sucking pretty hard
on the injector. Tracy
On Fri, Jan 7, 2011 at 9:09 AM, David Leonard <wdleonard@gmail.com> wrote:
Isn't your tank vented? Shouldn't be able to
pressurize it. Maybe you pressurized the fuel line with some
air?
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
On Thu, Jan 6, 2011 at 7:32 PM, <hoursaway1@comcast.net> wrote:
Long story short, standard eng. shut-down, main fuel pump
switch to OFF, half second or less, eng. quits rather
quickly. """UNLESS""" you are low on fuel,,,
& picked up some air in the lines,,, eng. remained
running,,, after shaking the thoughts of gremlins out of my
head, possible as long as 20-30 seconds & quick look at fuel gauge
for tank I was on the thought came to me that I picked up air from empty
tank & pressurized it with fuel pump, I now have an air pressure-fuel
pump backup sys. so eng. will remain running, had to shut down elect. to
stop eng. How about that one to start the year. David R.
Cook RV6A Rotary.
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