description of the exit of the fuel pump
 

https://blazerforum.com/forum/attach...ine=1355350163

Please write where is the fuel return without pressure, and where the fuel from the pressure.

View "from the top":

yellow means
central means
and the last blue, which means

I want to connect to the car's heater and must be connected to the fuel return.

I have 1999 blazer 4x4 4.3L LT

Connect to the heater??? Whatever you're doing doesn't sound safe to me. What exactly are you doing or installing?

Yellow pressure, other end return, middle evap crap

That seems like a lot of work for no benefit. This is not a diesel engine. What is your purpose?

^ this??

After that video I'm more confused! Why not just get remote start???

better off with either a remote start or an engine block heater...

Ohh thats what it is.. I thought it was to keep diesel engines warm so they would start faster

it does that too cherry but diesels have block heaters now and glow plugs.