by Skywatcher » Sat Aug 07, 2021 2:14 pm
Hi Again Lefty
This sounds more like a fuel supply problem, time for some basic diagnostics. Run the unit until it surges and quits, loosen the fuel cap, do you hear a vacuum release? If yes, tank is not venting. If no, problem is further down the line.
Does this fuel system contain a filter? If so, is it plugged? Disconnect the inlet fuel line to the filter and hold end of line below level of fuel in tank, does fuel flow from the line? If yes, tank and fuel line OK, if no you've found your blockage. Remove fuel cap and use regulated compressed air around 10 psi and blow back through the line into the tank from the tank, do you hear bubbling in tank? Yes, blockage has been cleared. No, tank and line will require removal and flushing.
Connect a temporary fuel supply to pump and start engine, Does pump dray fuel from temporary supply? If yes, you've found the problem between tank and filter. If no, fuel pump not working or line between pump and carburetor may be plugged, but you alluded to that line being clear when you heard the vacuum release. Please let us know what you find. All the best,
Sky
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