P0440

**Spikito** · 01-13-2010, 09:51 PM

showed up today on my buick,

some kind of EVAP code, says something is up with my fuel pressure. My first thought was to pop the schrader valve to relieve it, but I haven't done it yet.

Online it said something about an EVAP canister getting clogged?

Just wondering what you guys thought about it

**Too Fast** · 01-14-2010, 02:37 AM

Can't remember off the top of my head, but I believe the 440 code is a gross evap leak.

First thing to check is your gas cap. If it's loose/off, it will set the gross leak code pretty quickly.

**0rion** · 01-14-2010, 02:42 AM

check your cap and the lines to your evap canister.

**konigandy6** · 01-14-2010, 04:54 AM

fuel vapor leak... check gas cap and vent valve.

**Cutlass** · 01-14-2010, 01:44 PM

p0440 is the famous gas cap code. Could also be other things but usually loose gas cap. tighten it down and clear the code

**Spikito** · 01-14-2010, 02:42 PM

ok cool, will do....and i have no idea where this evap canister is located, lol

**0rion** · 01-14-2010, 05:16 PM

usually in the rear of the car somewhere near the tank. On the f-bodies it's behind the drivers side rear tire between the fill nozzle and tail light assembly.
Get under there and follow the vacuum line coming out of the tank and it'll take you right to it.