was getting random P0440 Evap code
was fixed wirh a new fuel filter
hope this helps
I was pulling my hair out trying to pinpoint this
new gas cap smoked the fuel system
NO MORE CHECK ENGINE LIGHT

 

Well I did my cap and rotor with plugs. Also I did my fuel filter. Before my engine light was on. By time I would get home it went away, It came back today and I checked and it was P0440..However I have 148,900 Miles its a 2001 Blazer LT 4x4. I have a Cappy fuel gague too, jumps around steady at full tanks and starts acting up at 3/4 tank, would this have any thing to do with my code?

 

Have a read through this:
P0440 - Evaporative Emission Control System

 

I have, great t/s steps by the way. I took a look at it today and i found a rub on the vent line near the distributor going towards the radiator. Also, found a split in the vent like near abs pump, three way split and a check valve, and a green tube. However the line are rubber, 5/16. I got under my Blazer and didn't see any more rubber lines, or did I over look them. How big of a pain is it to run new vent lines?

2001 Blazer LT
4x4 148,900 MI

 

The EVAP lines are nut rubber. They are predominantly hard plastic. They run from the purge solenoid located near the ignition coil to the fuel tank, charcoal canister, and vent valve.