Cummins 330B mechanical engine: I have an air leak in my fuel system I’ve been chasing down for ages. Using clear hose (temp only, used at the dock) I’ve tracked it down to my primary (NOT the last chance on engine) fuel filters set up. My primaries are a dual head spin on type (ff5013 then fs1001, the SMX double double set up). I’ve tried changing the filter canisters, but the leak persists. It’s not horrible, the engine never shuts down, but she does stumble after idling for extended periods as she clears the air. At 1900 RPM I can easily see the pea sized bubbles every few seconds in the clear tube after the fuel leaves the primary filters, vacuum is about 3”. Rather than disassembling my primary filter system (there are about a dozen connections, with valves and the 2 filter heads), can I hook up a pump and pressurize the filters and engine lines? I can close off the tank side but I can’t easily close off the engine side. Will pressurizing the lines harm the engine/lift pump? Thanks in advance.