Please HELP. Hydrotek burner problems

Hello everyone. New Guy here. Desperately need help. Have a Hydrotek ss3500hg 2 yrs old. Tons of white smoke. Insulation was soaked in diesel. I change the fuel filter cleaned the electrodes replaced the fuel nozzel and replaced the insulation. Just to get it fired up and still do the same thing. I have heat. When I pulled of the copper transfer line turn the key on engine not running turned burner on I got fuel. Put transfer line on checked return to diesl tank and it's returning. But I sniffed the exhaust after that and chamber smells like fuel still. I can't figure it out I'm loosing my ass right now. Any help would be very much appreciated. Thanks
 
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