I just discovered a problem I didn't know I had until now. When I bought my boat there was a box of filters in the engine room. I have a FRAM fuel filter housing. It is an FCS 1136M. The replacement filters in my box were CCS 1136 I used them up and when I went to replace them from Boatus I discovered that they were for gasoline instead of diesel. They sell two different replacement elements for diesel fuel, one is a fuel separator the other is a fuel coalescer. My question is what do I need? Do I need both? Also what is the effect of using the filters meant for gasoline? Thanks for any help.