Hello, Can anyone help me with some OMC or GM part numbers for my fuel filters. I'm looking for the filter that sits above the pump and also the one in the carb. I think it is the dual diaphragm pump. It has the over flow sight glass. If I understand correct, the single pump does not have the sight glass. It is a 1978 OMC 120/400 stringer. The guy at the local omc supplier was not much help and I'd like to try and get these locally asap. I tried to look for a Sierra # on this site, but could not find a parts look up. I did get directed to omc fuel filters, but I don't know which ones are the ones I need. Thanks