Re: bad fuel delivery 77 c20 dual tanks
The plastic vent looks funny, maybe it's broken. I'm 99% sure my 76's have return lines. If your plastic vent is open I would replace it and leave everything as is. You should check either fuel pressure or do a fuel volume test. I don't know the specs for fuel volume. I would probably be tempted to splurge $20 on a new fuel pump anyway.
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76 Chevy K20
76 GMC K15
77 Chevy C10
77 Chevy K10
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