tbi fuel sending unit

[monte51087]

i have a 85 tbi fuel sending unit. There are three lines coming out of the unit, one is feed, the other vent and then return. I was wondering which is vent ? and which is return? any help would be great, thanks

 

[dogsht]

I assume from a 4.3 Monte Carlo. I can't remember off the top of my head but they sell new ones with pics & info on ebay motors. If no one knows you might find the info you need there.

 

[monte51087]

oh ok because im trying to finish up with the lt1 swap and kinda stuck on the gas tank piping

 

[darbysan]

IIRC, the feed line is 3/8", the vent is 5/16" and the return is 1/4". The return goes al the way to the bottom of the tank. It is the line that the pump physically mounts to.

 

[monte51087]

oh ok thanks alot great info