Don, You simply put the electric pump in series with the existing mechanical pump. Put short piece of fuel line from the tank output line to the input of the electric pump and the output goes to the steel fuel line that goes the mech pump. Once the engine starts the mechanical pump takes over and pulls through. If your mechanical pump ever fails, you have a built -in backup. Use a push button to supply power to the pump, and that way it won't stay on by mistake like what could happen with a toggle switch. I have read of other ways to power the pump that do not require a separate switch, such as connecting it to the ignition switch start terminal, and putting the car in drive (or reverse), and the neutral safety switch cuts out the starter relay while energizing the pump as you turn the key to the start position. Bob J From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Donald Nissen Sent: Friday, October 14, 2011 9:33 AM To: Chrysler300@xxxxxxxxxxxxxxx Subject: [Chrysler300] Re: AUXILLARY FUEL PUMP I've got the same problem with evaporation on my 300K, but have wondered how to install the pump. Does it go inline so that it acts as a boost pump and when off, the mechanical pump just pumps thru it, or is it on all the time & is it capable of providing enough volume of fuel for these thirsty beasts? Any help would be appreciated. Don Nissen [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/