Slight carb leak...?

bobpo1

bobpo1

Senior Member
After putting out hundreds of dollars in carb repairs , etc., I still find a slight leak at the bottom of the carb on my '30 coupe while sitting parked. I have the gas valve shut off. What should I look for? :confused: The fumes are what gets my wife.... And that can't be tolerated. :D
 
When you park in garage turn gas valve off-letting run till it stops getting the gas out of the carb. Model A's always have the gas smell-vintage.
 

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what has been done to the carb so far to account for hundreds of dollars?
what carb are you running?
 
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If everything is working properly and you're getting a leak, try lowering the float level 1/8" and see if that helps. An 1/8" won't effect drivability.
 
Also see if the main shutoff valve under the tank is leaking. With a bad seat at the float valve you will get seepage/fuel leak.
Bob
 
I'll try with shutting the valve off then running out of gas first.
Then I'll try the 1/8th inch with the float.
The carb was rebuilt after I bought it from a fella who claimed he'd rebuilt it....????

Thanks to all, 1st Car Show tomorrow, looking at Best in Class (1900-1949) again..LOL
 
Bob,
I would turn the gas OFF on Minerva, run carb 'til EMPTY. After 2 days, she would start with the gas valve OFF!! DAMN TRICKY VALVES! For $4.99, at the hardware store, bought a perfect fit, petcock type valve & NEVER a problem with FUMES or SMELLS anymore!
Bill W.
 
bobpo1 said:
I'll try with shutting the valve off then running out of gas first.
Then I'll try the 1/8th inch with the float.
The carb was rebuilt after I bought it from a fella who claimed he'd rebuilt it....????

Thanks to all, 1st Car Show tomorrow, looking at Best in Class (1900-1949) again..LOL
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I had the same problem with Sarah when I brought her home. After replacing the GAF rod and the fuel line, I also took the "shut off gas" recommendation. It works but I shut it off and wait for it to start sputtering and then I shut of the engine. Haven't had one drop of gas leak out anyplace. Turn the gas back on and wait for about a minute, turn the key, hit the starter and away she goes anytime afterwards, even days, even weeks.
 
you shouldnt have to run the carb bowl out of gas to stop the fuel smell.
a bad shutoff, float valve or improper float level are the most common things.
 
Mitch//pa said:
you shouldnt have to run the carb bowl out of gas to stop the fuel smell.
a bad shutoff, float valve or improper float level are the most common things.
Click to expand...
WELL, Kid,
Hate to "pop your bubble"--BUT HERE @ 108 Degrees & a "perfect" Zenith, park that dude, in the garage, HOT, with the carb FULL of gas & that sucker will boil the gas in the carb, PUKE fumes out the bowl vent & out of the carb throat & once, Pat smelled it in the BATHROOM, EVEN!!!:eek::eek::eek: & I wuz in a HEAP of TRUBBLE:eek:
dAD
 
BILL WILLIAMSON said:
WELL, Kid,
Hate to "pop your bubble"--BUT HERE @ 108 Degrees & a "perfect" Zenith, park that dude, in the garage, HOT, with the carb FULL of gas & that sucker will boil the gas in the carb, PUKE fumes out the bowl vent & out of the carb throat & once, Pat smelled it in the BATHROOM, EVEN!!!:eek::eek::eek: & I wuz in a HEAP of TRUBBLE:eek:
dAD
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Drill a couple holes in ur t-stat and that wont happen:D

sooonoout
 
The fumes may not be coming from the carb at all. Have you checked around the bracket under the tank that supports the steering column? Over the years they seem to work loose and will leave the car full of fumes.:cool:
 
bobpo1 said:
... I still find a slight leak at the bottom of the carb on my '30 coupe while sitting parked. I have the gas valve shut off. .... :D
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Simple, if you can see or feel the liquid have a leak! If you can only smell it may be vapourisation ( carb, tank,manifold, exhaust system). Thanks to gravity ALL carb leaks and most fuel line leaks can manifest themselves as a leak/drip at the bottom of the carb. Do a search on this forum and you will get the full list of sources of leaks on carbs (about 12 possibles) ,fuel lines and connections. It's one of those.
 
Well, Miss Tilly did take the "BEST IN CLASS" again, even with the slight gas leak. Had some great competition this time. . Class was 1900-1949.
 
Here is one other line; is it really a leak or is it just the raw gas running back down the inside of the manifold and carb when you shut it down. How far open is the GVA, could you be running too rich?
 
redmodelt said:
Here is one other line; is it really a leak or is it just the raw gas running back down the inside of the manifold and carb when you shut it down. How far open is the GVA, could you be running too rich?
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I can turn the GAV all the way in and it will still run. I'm assuming that I need to rebuild the GAV. Also, should I turn the GAV all the way in when parking it for the night...???? :confused:
 
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