Why is My Carter Carb Leaking Here?

[SgtSuperbird]

I'm working on trying to get my Hurst SC Rambler started. Almost there, but I have a gas leak in the front of the Carter carb (4664, 4 bbl, 1969) just above, and to the left and right of the large vacuum port. What are those small passages (circled) and why would they be leaking? The carb was recently rebuilt by me, so it's something I obviously missed.

 

[Geoff 2]

I have seen those in a few carbs; they go into the t/bores. I would block them off & I doubt you will any difference. I think they are to vent vapours, but vapours can vent past the boosters. Block the holes with a coat hanger/welding wire & test drive. If car drives same as before, epoxy the wire in place for a permanent fix.

 

[eldubb440]

we need pics of said Hurst SC Rambler

 

[SgtSuperbird]

Of course...(it's not quite finished yet, but oh so close).

 

[SgtSuperbird]

I did figure out the carb issue. It stopped leaking out when we quit pouring gas into the carb, and put gas into the fuel tank instead. Duh!

 

[Vaanth]

I'm working on trying to get my Hurst SC Rambler started. Almost there, but I have a gas leak in the front of the Carter carb (4664, 4 bbl, 1969) just above, and to the left and right of the large vacuum port. What are those small passages (circled) and why would they be leaking? The carb was recently rebuilt by me, so it's something I obviously missed.

View attachment 2045368

View attachment 2045369

The holes are vapor vents. These vents were added on some AFBs to assist in hot starts.

The following images show the vents in a diagram and Carter's description:

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[SgtSuperbird]

Thank you for the diagram. I'm still learning. The FSM nor the exploded view of the carb showed that.

 

[HawkRod]

I did figure out the carb issue. It stopped leaking out when we quit pouring gas into the carb, and put gas into the fuel tank instead. Duh!

It's always nice when it is something simple!

 

[ckessel]

I worked on one of those to replace the master cylinder. Boy...was that a fun job.

 

[SgtSuperbird]

I worked on one of those to replace the master cylinder. Boy...was that a fun job.

So, you experienced the awesomeness of close quarters? As you know, you have to unbolt the power brake booster to swing the master cylinder away from the shock tower. I had to do this for the master cylinder AND to replace the wiring harness - which is one piece - the dash and engine compartment together. How fun!

 

[ckessel]

I also pulled the hood off so I could get into that area better. Had to do the job twice as the car owner supplied a "correct" master cylinder which had a shallower pushrod hole than what I took out. Brakes stayed applied. Thats when I learned to measure the bore depth before installing a "correct" cylinder.