I have a 2003 duramax that I bought new. Got started on changing fuel filter for the first time [dealer did it in the past]. I have taken out the battery and inner fender panel so that every thing is very accesable. My problem is trying to unhook the electrical connector. I had read on this forum I think that you have to squeeze it to remove I have not had any luck and am afraid I will break it if I pull to hard. What am I missing on this. Thanks.