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My Devilbiss EGA-503-390F suction feed spray gun won't spray any materials with a viscosity greater than water. I purchased this gun in March 2010, and it was fine. I have cleaned, chnaged the needle packing and lubricated the gun, but the problem still exists. It is as though the suction is low from the 8 oz. cup. I have tried opening the needle to full open, and air pressures from 20 to 80 psi, and it makes no difference.

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  • kenneth sharkey Apr 15, 2012

    Jim i am just wondering if you could let me know how to change the Needle Packing i have brought a repair kit and i am not sure.

  • Roy Lane
    Roy Lane Sep 10, 2014

    Probably neds a larger needle valve say a 1.8mm or 2mm I had the same problem. If you have too much air oressure the air will move too fast to pick up the paint and air is all you will get. 25 to 35 PSI is plenty.

  • Roy Lane
    Roy Lane Sep 10, 2014

    And as you thought if the paint is to thick it won't pick it up, even a gravity feed won't work if the paint is too thick or you have too much aur pressure.

  • Roy Lane
    Roy Lane Sep 10, 2014

    Just go with a larger needle valve and nozzle



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The EGA-503 only comes with one set of air cap and Nozzle Size (!). And this is suitable for light and precise touch-up jobs. If you want to spray something heavier, then you would have to change the set-up, i.e. larger nozzle. But for EGA-503 only 390 (air cap) and F (nozzle) are available. Theoretically you could check for the predecessor EGA-502 which had different set-ups, incl. nozzles called "EGA-608-G" and "EGA-608-E". However, they are only limited available and you would have to change needle and air cap too. This makes the whole thing probably too costly.....


Posted on Jun 02, 2011

Testimonial: "Okay. I guess I will purchase a new spray gun with a larger orifice. Thanks, Jim Goewey"


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