Goodwin Gump075-3 fan comes on ,glowplug lights up ,hear a click but doesn't light burners ,no flames ,glowplug goes back out .can't get it to ignite the flames ,tried several times still nothing.

Is the gas valve set to "on" ? Check for 24 volts AC between the two terminals on the gas valve. You should get 24 volts (+/-) sometime shortly before the ignitor goes off.