I'm new here and looking for some info or part . I just bought a Satoh s 630 for back up to the one I use. The seller claims it ran fine until he cracked the fuel filter in his vineyard. He bypassed the fuel filter unit and connected fuel line directly to fuel pump., but said he couldn't get it to start said he didn't bleed fuel line. also says it needs new switch. What i'm looking for is the lock ring for the fuel filter, also would it be ok to just install an inline fuel filter. I know it needs some kind of filter. Thanks in advance.