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B48G — Before testing make certain that fuel pump vacuum line

For the B48G.

Procedure

  1. Operate engine at an idle for five minutes to ensure
  2. Shut engine off and remove fuel inlet line from fuel

Source: manual:965-0757_Onan_B43E_spec_A-D_B43G_spec_A-D_B48G_spec_A-G_Engine_Service_manual_06-1988.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.