Hey Guys, Is there a specific sending unit line that should run to the vapor canister? Found this old post by Drew, sounds like there is. Which one is it? Thx! I'm specifically asking for a later model TPI system, probably 1989 or so and up, could be earlier, at some point the vapor canister was changed.

Also, where does the 4th line run to?

* To Fuel Injectors
*. To Vapor Canister
*. Tank Vent Valve
*. Fuel Return line to tank????

So, if you swap the Vapor Canister and Fuel Return line, is that going to create an issue? Seems like both would have one way valves??


https://www.thirdgen.org/forums/hist...ml#post5920265

 

I think the vapor canister line runs to that round bronze colored thing....I assume that only allows vapors to be suked up if the fuel is sloshing around.....it looks like its connected to the fuel pump feed line but its just the angle of the pic


.the return line i think just dumps back into the tank from an open line if i recall.

 

After looking closer at this link https://www.thirdgen.org/forums/hist...ml#post5920265 and also this https://ecat.spectrapremium.com/products/FG20A

Also finding:

Supply line is 3/8"
return line : 5/16"
evap line : 1/4"

It could be this? Can anyone confirm?

 

The evap line will have the smallest diameter of 4 the lines. 1/4" sounds correct.