Solved- 1957 Holley carb primary vent leaking gas

[BarretHC1]

1957 stock Holley carb leaking fuel bad from primary fuel bowl vent. A TON of people said check float and needle/seat assembly. I did and everything checked out. Well, after 2-3 weeks of trying different parts, turned out to be the small O ring on the needle.seat assembly itself.... Crazy! Small part can cause such a major issue.

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[doug7740]

1957 stock Holley carb leaking fuel bad from primary fuel bowl vent. A TON of people said check float and needle/seat assembly. I did and everything checked out. Well, after 2-3 weeks of trying different parts, turned out to be the small O ring on the needle.seat assembly itself.... Crazy! Small part can cause such a major issue.

It does make sense how the defective O-ring was allowing the fuel to bypass the needle and seat and causing your primary fuel bowl to overflow.

doug7740
1955 Thunderbird Blue