vw polo no fuel at start up ?

hi i have a 1994 polo with a starting problem after fitting a new cd player it will now not start it turns over no problem if i spray easy start into the opening under the air filter it will start and run normally but as soon as i turn it off it will not start until more easy start it put into the air intake i can hear the fuel pump humming when i turn on the ignition but is there any sort of fuse or relay that may have shorted on the fuel system i have checked all fuses in fuse box inside car all seem ok