Fuel is not getting from the fuel tank to the fuel pump of my Volvo Penta SX. I think the fuel tank has a 'pumice' type filter and is perhaps clogged. I used Stabil when winterizing as I always do but perhaps the gas 'varnished' anyway. Access to the fuel tank is difficult. Can the filter be unclogged by pouring any chemical in the hose that goes from the fuel tank to the fuel pump. If not, i have been told I can use a compressor to blow the fuel filter in the tank off. If I did that I would probably add an inline filter to the hose from the fuel tank to the fuel pump. Anyone have any thought?