I use a dedicated small yellow sink plunger. It does not look like something you would use elsewhere. Very discreet. Used to use my electric air compressor, but this does the same thing much easier .Some charter boat captains around here will t...
Check for any low spots in the vent line. Vent should be highest point and slope down all the the way to the tank. Any sags/low spots will trap fuel. If no low spots, then likely a bigger diameter air vent line is needed as per Steele'y comment. ...
Likely there is fuel in the vent line. I remove the filler cap and use a plunger over the vent fitting on the the hull to force the diesel out of the line and into the tank. Have to do this for the port tank on my boat that has a long vent hose. I...