MYSTERY PART IN FUEL LINE

[colitatx]

Hello to All
I have an 83FC with a 3208 cat. I have a leak in the fuel network and I
have no clue what the part is. It is silver in color and very brightly
polished. It has an In and Out fuel line and a single Wire, the leak is on the
"out" side. I have crawled all over the underside and can't tell where the
copper tubing comes from or where it goes. It has Holley stamped on it, has a
"capped off" (drain?) in the bottom and what appears to be an adjustment(?) on
one side. That is about all that I can see. It is located between the frame
rails, to the passenger side of the drive shaft, near the air dryer, at about
the back of the propane tank which is outside of the frame rails.
Thanks to All for their help.
Bill Mills 83FC
Livingston Tx.