1987 Fuel Sender Conversion for LSx Swap

[bh86]

What’s everyone doing with the vent line?

[aggie91]

Originally Posted by bh86

What’s everyone doing with the vent line?

I just added a length of line from the sender to the top of the frame rail and used a Dorman 14689 GM Axle Transmission Tube Vent Breather 1969-2002 on the end and zip tied it to the frame rail.

[SunSoaked]

Originally Posted by aggie91

I just added a length of line from the sender to the top of the frame rail and used a Dorman 14689 GM Axle Transmission Tube Vent Breather 1969-2002 on the end and zip tied it to the frame rail.

So your tank fumes just vent underneath your truck? How's that work in closed spaces?

[aggie91]

Originally Posted by SunSoaked

So your tank fumes just vent underneath your truck? How's that work in closed spaces?

Pretty much direct to the atmosphere. I have never noticed it at all, even before the LS swap that was the way the tank vent was done from the factory.

It is rarely in closed spaces long enough to notice any smells...

[SunSoaked]

Originally Posted by bh86

What’s everyone doing with the vent line?

I just converted my 85 this weekend.

The OEM vent is 5/16. It is now the return line.

The OEM return line off the mechanical pump is 1/4. It is now the vent line. The 87 sending units use a 1/4 vent line so it's meant to be! My vent line t's both my tanks in back and goes to the charcoal cannister up front. Working great.