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NS2 - Fuel System Tests

  1. Remove air cleaner cover. Move throttle linkage by hand several times. Check for fuel spraying from accelerator pump nozzle. If no fuel is spraying, proceed to step 2). If fuel is spraying, check for fuel-fouled spark plugs. If wet with fuel, clean and reinstall. If spark plugs are dry, check ignition timing. If okay, check valve timing. If not, set timing to 10° during cranking. If engine starts, reset timing to specifications. If engine does not start, check valve timing.
  2. Remove fuel hose from carburetor. Place hose in a clear container. Have assistant crank engine. A pulsating stream of fuel should flow into container. If so, repair inlet circuit of carburetor. If fuel flow was not satisfactory, remove hose at fuel filter that leads to fuel pump. Connect a vacuum gauge to disconnected hose. Have an assistant crank engine for 10 seconds. Vacuum should increase from zero in. Hg during cranking. If not, replace fuel pump.
  3. If vacuum was okay in step 2), remove vacuum gauge from hose. Reconnect hose to fuel filter. Remove fuel inlet hose at fuel filter. Connect vacuum gauge to inlet nipple of filter. Again, have an assistant crank engine for 10 seconds. Vacuum should increase from zero in. Hg during cranking.
  4. If so, vacuum is okay. Check for plugged fuel lines back to tank. Also check fuel tank venting and in-tank filter. If vacuum was not okay in step 3), replace fuel filter.
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