Victor, There is no need to leave the electric pump on, the mechanical pump will pull through the electric pump with no problem. If you happen to have the mechanical pump fail, the electric pump will be your backup when you switch it on. As far as leaving it on all the time, the pressure will be limited by the design spec, which is 5-7 PSI per the AMA spec, and the engine will run fine. The concern would be if the mech pump diaphragm fails and you pump gas into the crankcase, which is not a good thing. That's why I turn mine off once it fires. You could also-remove the mech pump and install a block off plate too. In that case you would just leave the electric pump on full time. Bob J _____ From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of VICTOR KOONTZ Sent: Saturday, December 29, 2007 9:44 AM To: chrysler300@xxxxxxxxxxxxxxx Subject: [Chrysler300] cold start I took your advice & put an elec. fuel pump on my 300F. With it on & the engine off there's a very small flow at the carbs but after 15 secs. the car will start with very little cranking(which is good).My question now is ,once the car is running should the elec. pump stay on,& does this cause too much pressure to the mechanical pump,or if the elec. pump is shut off does this pump restrict the flow of fuel too much? If so what is the remedy? [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 For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! 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: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto: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/