How do I vent Spectra tank?
Thread Starter
Joined: Apr 2007
Posts: 330
Likes: 1
From: Chicago, Illinois (far south)
How do I vent Spectra tank? Here's a pic of my Spectra GM42BFi tank going into my 71 Firebird:
There are what appear to be 2 vent lines on the left and one (not pictured) in the same spot on the right. These are supposed to go to some sort of recovery tank behind the rear seat and then one would go to the charcoal canister in the engine compartment. I don't have the recovery tank or canister and am doing an ls swap. I'm sure I can cap off two of them, but I would think that one has to provide a vent somehow. What can be safely installed back there without causing too much of a buildup of fumes?
There are what appear to be 2 vent lines on the left and one (not pictured) in the same spot on the right. These are supposed to go to some sort of recovery tank behind the rear seat and then one would go to the charcoal canister in the engine compartment. I don't have the recovery tank or canister and am doing an ls swap. I'm sure I can cap off two of them, but I would think that one has to provide a vent somehow. What can be safely installed back there without causing too much of a buildup of fumes?
On The Tree
Joined: Feb 2014
Posts: 102
Likes: 0
You definitely need a gas cap that is capable of allowing air into the tank as the fuel is being drawn down. You also need some way to vent pressure in the event that the pressure gets too high in the tank. I'm sure somebody makes a gas cap that is capable of both functions. If you can find that then you could just plug all 3 lines. I think that gas tank is setup so if you wanted to run a full modern evap system you could.
I just found a pipe thread thread sintered bronze muffler and put it on some 1/4" fuel hose and ran it to the high point above the rear axle. I guess this is sufficient.
http://www.amazonsupply.com/parker-e.../dp/B003Q6CBO8
http://www.amazonsupply.com/parker-e.../dp/B003Q6CBO8
Last edited by ryanleiker; Jan 9, 2015 at 03:55 PM.
