?? I am not sure it is physically possible to pull more than one atmosphere of vacuum. That would be less than nothing! One atmosphere = 30 inches vacuum! My "official" Racor gauge has the yellow line at 7 inches vacuum and the red line at 10 inches. I have never had it go above 0 unless something is wrong and I don't think I get much more than 10-15 inches running the pump against a closed valve. There is nothing special about the Racor gauge except the pretty colors, you can get vacuum gauges from FleaBay or the hardware store that work as well. When I had a vexing fuel issue I had two gauges installed, one before and one after the filter. A clogged pickup pulls vacuum on both of them, a clogged filter just one. Turned out bits of rubber fill hose had fallen in the tank and would get sucked onto the pickup tube. If you can't pull any against a closed valve you have air leaks. I also have a cockpit mounted fuel pressure gauge that is nice, it has a red light that goes on when the fuel pressure falls below 1 PSI.
Joe Della Barba Coquina C&C 35 MK I www.dellabarba.com -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Len Mitchell via CnC-List Sent: Monday, July 20, 2020 8:53 AM To: CNC List <cnc-list@cnc-list.com>; Tom Buscaglia <t...@sv-alera.com> Cc: Len Mitchell <xfireca...@gmail.com> Subject: [EXTERNAL] Stus-List Fuel polisher The electric lift pump on mine pulls 1 atmosphere of vacuum and Josh’s yanmar pulls 3 or 4 if memory serves. Len Mitchell Crazy Legs 1989 37+ Midland On. Sent from my mobile device. _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
