flyrotary@lancaironline.net Mailing List Archive

Reasonable question, but newer FI cars are putting the mechanical bypass-type regulator on the pump inside the gas tank, so I assume that any vapors get pushed through the injectors in short order. On 6/6/2010 9:04 AM, Kelly Troyer wrote: Charlie, Do you think there is a chance of any air bubbles (Say from an empty tank) collecting in the dead ended fuel rail and not clearing because the return line is at the regulator ??...... Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold ------------------------------------------------------------------------ *From:* Charlie England <ceengland@bellsouth.net> *To:* Rotary motors in aircraft <flyrotary@lancaironline.net> *Sent:* Sun, June 6, 2010 8:47:24 AM *Subject:* [FlyRotary] Re: high/low pressure pumps question Hope this helps... On 6/6/2010 2:21 AM, Todd Bartrim wrote: > > Hi Charlie; > Hmmmnn, I gotta say a picture (or drawing) is worth a thousand words. > Todd (sent on my new-fangled google phone with a really damn small keyboard) > >> On 2010-06-05 8:46 PM, "Charlie England" <ceengland@bellsouth.net <mailto:ceengland@bellsouth.net> <mailto:ceengland@bellsouth.net <mailto:ceengland@bellsouth.net>>> wrote: >> >> Hi Todd, >> >> My thought is to set up the fuel path thus: fuel source through a T into injection pumps, through filters, through combining T, through the regulator(in cockpit), through firewall to engine. The regulator's bypass port (in the cockpit) would be plumbed just like yours, except no heat exchanger since the bypass fuel would never see the heat of the engine compartment. The bypass would still T into the supply to the injection pumps, like your system. Obviously, a manifold pressure line would be required through the firewall into the cockpit to the pressure regulator. >> >> My original plan (different injection that didn't require a return line) was similar to your selector setup: main tanks feeding stock van's selector, with the 3rd port on it being fed by a 2nd vans selector to select either of the 2 aux tanks. No transfer pump would have been required, & no crossover valve. Failure of the primary valve could have been a 'show stopper', but the newer valves seem to be rock solid reliable. Going to this system using the gear type pumps requiring a return line forced re-thinking. Using your idea to return the bypassed fuel at the pump inlet effectively eliminates the 'return' issue, & tempts me to return to the original fuel selector layout, with the addition of a Facet boost pump. The fact that the optical sensors will work looking into the side of a fuel line (the T), instead of needing them in the tank & that they still give almost a full minute's warning, is very encouraging. I'll start looking for a convenient place to mount them. >> >> I hope that Tracy will chime in on how he plumbed the regulator on his -8. >> >> Many thanks for the extra details. >> >> Charlie >> >> >> >> On 6/5/2010 12:32 PM, Todd Bartrim wrote: >> >> > >> > Hi Charlie >> > Not sure I understand correctly what you mean? Can you >> sketch it out quickly? I'... >> >> > *From*: Charlie England <ceengland@bellsouth.net <mailto:ceengland@bellsouth.net> >> <mailto:ceengland@bellsouth.net <mailto:ceengland@bellsouth.net>> >> <mailto:Charlie%20England%20%3cceengland@bellsout. >> <mailto:Charlie%2520England%2520%253cceengland@bellsout.>.. >> >> > *Subject*: [FlyRotary] Re: high/low pressure pumps question >> > *Date*: Sat, 05 Jun 2010 08:38:09 -0... >> >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net:81/lists... >>