73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: BIG CHEVY on April 21, 2011, 08:12:13 pm

Title: sending unit tubes..
Post by: BIG CHEVY on April 21, 2011, 08:12:13 pm

can someone give me the rundown on the function of each of the three tubes on top of the sending unit? what would b the diff between 2 and 3 tube units?

Title: Re: sending unit tubes..
Post by: Grim 82 on April 21, 2011, 08:15:12 pm

The 3 port ones have a feed, return, and vent line. From what I understand the 2 port ones do not have a return line.

Title: Re: sending unit tubes..
Post by: bake74 on April 24, 2011, 09:07:12 pm

     Grim is right, all sending units should have a vent line in our trucks.