Larry, You are correct in that under pressure from another pump, the second pump should seat and shouldn't leak. If it does, the backflow would be more of a drip at the most. However, under very light pressure, like the head pressure from a header tank, the internal piston won't seat and the facet pumps will slowly backflow at the rate of a steady drip.
-Jeff > Sent: Sunday, August 04, 2019 at 7:38 PM > From: "Flesner via KRnet" <[email protected]> > To: "Jeff Scott via KRnet" <[email protected]> > Cc: Flesner <[email protected]> > Subject: KR> facet fuel pumps > > On 8/4/2019 7:05 PM, Jeff Scott via KRnet wrote: > > Facet does make a line of pumps with a check valve in them to prevent > > backflow. I haven't personally tested one yet, so can't say how effective > > they are. > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > My two Facet fuel pumps are installed in parallel. My concern was that > one pump running and the other shut off it might set up a continuous > circular flow backwards from the "on" pump through the "off" pump and > back to the intake of the "on" pump with no fuel going to the carb. > Before installing the pumps I hooked them up head to head and tried to > pump backwards through each pump. Zero fuel flow so I eliminated the > planned check valve. To date, 15 years and 700+ hours, the system is > working fine and any time above pattern altitude I only run one pump. > > Larry Flesner > > > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/[email protected]/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to [email protected] > _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/[email protected]/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to [email protected]
