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On your vehicle you will not hear a fuel pump when the key is on only while cracking. I have a feeling that the intank fuel pump is failing . The extended crank on the vehicle the tandem (high) pump will eventually get fuel from the tank but will crank for a while . An inspection is needed to make sure you do not have bad fuel and nothing has come apart in the tank . the access holse is under the back seat bottom .
no drain plug . you need to take the pump out using the access hole under the passenger seat rear. glow plug light has nothing to do with this!!
fungus mold and water should be checked. and yes the ring gasket needs to be replaced.
you can but need to see if there is voltage at the connector when cranking . test the system how it operates . a dry test may not lead the right direction except if the pump delivers low or no volume!!