Re: bad fuel delivery 77 c20 dual tanks
The plastic thing is the vent. My 75 has the same setup. You use the 1 wire solenoid 3 pipe valve to switch between tanks. Probably want to replace the dash switch if your gas gauge has problems, especially the go to 3 o'clock issue.
The vent should have a hat like thing over the end. Looks like yours may have broke and settled. Orange ring in 1st pic.
Ask for a differential vent at the parts store. Should be the same thing.
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