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Carb leaking

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jerrybny

jerrybny

Jedi Knight
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Hi all. Been awhile since I posted but I have been trying to figure out my leaking front ZS carb on my 73TR6. It doesn't leak when running only after sitting. I replaced the float and jet and cleaned everything up. That made it overflow a lot less. Now it takes a day or so of sitting after driving it before it starts to overflow. I adjusted the float to the specs in the book. Any harm or performance hits if I adjust the float so that it closes the jet sooner? Thanks
 
In the absence of other changes:

Lowering the float level leans the mixture

Raising the float level richens the mixture
 
I've got a few suggestions to check based on some recent past experiences.
I had a similar overflow problem with my 71 TR6. During my frame-off rebuild I replaced the entire fuel line from the tank up to the y splitter tube assembly and added a filter so I thought it couldn't be crud from the line or tank causing the problem. As a result, I figured a carb rebuild was in order. Not too much after the rebuild it happened again. I then realized I neglected to clean out the y splitter tube assembly that routes the fuel to the carbs. I plugged the ends and flooded the tube with carb cleaner, let it soak, and then rinsed it real good. For now, it appears to have stopped the flooding problem. While you're at it, replace any connecting hoses between steel segments with new hose sections since if they're in bad shape, they might release chunks that can similarly plug things up. When you have the carb apart, remove the valve and thoroughly clean the fuel inlet section since sometimes bits of whatever can float around in the fuel flow path above the float valve and cause it to plug.

Ron
 
John, you didn't say where the carbs are leaking, but just setting sounds like the "O" ring in the bottom of the bowl where the plastic plug goes in. If this is your problem, take the bowl off, (6 screws, using flat head screwdrivers of 6 different lenghts, ha ha, painfull, but beats taking the carbs off). Push in the sides of the plastic and work the plug out, you will find a flatened "O" ring. Clean it up, go to Lowes or Home Depot and get a pack of # 13 "O" rings from the plumbing department, install with a little grease and slide it back in. I did this about a year ago when I needed to drive the car and had a leak and not enough time to wait on a part. I haven't had a problem with gas causing the rubber to break up and still no leak. I think most of the stuff today is synthetic rubber anyway.

Wayne
 
Hey Jerry,

I agree with Wayne. I just got back from a 2-week trip to the mainland and hit the fuel pump lever to fill the carb bowls. Fuel started pouring from the bottom of the rear carb. I pulled down on the plug Wayne's talking about and out it came. The o-ring had hardened and was not sealing at all.

I'll check out Home D for a #13. Mahalo for the tip, Wayne.
 
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