Unlike a car, our boats being fiberglass, require a ground wire. If there is 
not a black wire (ground) attached some where on the pumps metal frame, add one 
and run it to a ground buss. Unfortunately a lot of manufacturers use a black 
lead wire from the pump for the 12v connection.  I installed an electric fan on 
my truck, and couldn't figure why it still overheated. Come to find out the 
blue wire was ground and the black was positive. I was running the fan 
backwards. Doug Mountjoy sv Rebecca Leah C & C Landfall 39Port Orchard Yacht 
Club Port Orchard, WA
-------- Original message --------From: David Knecht via CnC-List 
<cnc-list@cnc-list.com> Date: 9/22/21  07:16  (GMT-08:00) To: CnC CnC 
discussion list <CnC-List@cnc-list.com> Cc: davidakne...@gmail.com Subject: 
Stus-List Fuel pump I am trying to diagnose fuel issue. I dont understand pump 
wiring. There appears to be only one wire to pump. Where is it grounded?Sent 
from my iPhoneThanks to all of the subscribers that contributed to the list to 
help with the costs involved.  If you want to show your support to the list - 
use PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks - 
Stu
Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

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