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  1. #1

    Default new guy here with 0440 trouble

    hey everyone, new guy here. name is Edwin out of Kentucky. I recently purchased a 2002 chevy blazer, 2wd, 4.3 vortec. its a great vehicle it has some good get up and go under the hood and besides the gas mileage im pretty satisfied. lately though as of last week my check engine light came on and hasn't left. I took it to autozone and got back 0440. I researched it online at home and got back a variety of issues which ill admit I honestly am not familiar with. the rubber seal inside the gas cap is intact but is cracked all the way around, going to replace it soon. however the reason im posting this is because early this morning around 3:30ish when I got off work as I was on the highway my check engine light started blinking for a few seconds and then stopped (its still on) I needed gas so I filled up the tank all the way (a whopping $61) and noticed some fluid dripping from underneath the rear driver side by the gas tank. I checked it out and it was water?? confused I drove home and parked it and gave it a closer inspection. there are 2 hoses that are labeled FUEL, and a few others, those are ok it seems. above those hoses it looks like what I can only describe as a rubber nipple like piece that was dripping fluid continuously, so I manned up and tasted, it tasted like dirty water, so good thing its not fuel. Now today when my girl took the truck out she says she can smell fumes heavily in the cab. like I said earlier im not familiar with evap systems or 0440 but I am mechanically apt so im fairly sure with the right information I can save hundreds and do it myself. if anyone on here has had the same symptoms or anything similar or anything related to 0440 please help, any information will be greatly appreciated. thank you.

  2. #2


    I believe that 440 is a large leak. If it is not the gas cap then it could be the purge solenoid. If you search around the forum I think that there is a thread that tells you how to take it apart and clean it. Here is one post where a member fixed her po440 by cleaning the egr valve.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3


    I checked out that forum post and unfortunately it didn't give me any insightful information on how to fix my issue. I have no idea what these parts are or where to locate them to fix it.

  4. #4


    Welcome to the club Edwin, it's great to have you aboard.

    2002 Chevrolet Silverado Extended Cab SportSide: See Mods in My Garage

  5. #5


    Welcome to the G M T C !

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  6. #6


    welcome to the forum. when i had my 04 Silverado i picked up a Haynes manual. it was the best i could find but it may come in handy

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