my magna motor has been running fine . then after travelling 120 kms it just stopped dead. checked all fuses all ok. checked spark and was ok '. motor turns over freely but wont start. loosend fuel return pipe on end off number 6 fuel injector, turned engine over and fuel poured out and engine started .tightened pipe again and started motor now runs fine ..took for drive and there is no problem with it.....can it have been a fuel air block..or something else , have you heard of this happening before ..thanks for any info cheers ashley