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Message: <blockquote data-quote="ajwgator" data-source="post: 117131" data-attributes="member: 226">You can test them without pulling them out.  Disconnect wire from the top and use an ohm meter to test for continuity.  A good glow plug will have very low resistance.  A bad one will read open.  Place your positive lead to the post the wire connects and your black lead to the body of the glow plug (wrench flats).Concerning loosing prime in fuel system, check your fuel line going into & inside your fuel tank.  They seem to dry rot at the top area inside the tank.  Same with your fuel bulb, being hard it could have cracks in it too.</blockquote>