The Ford Barn

jerrytocci · 06-04-2021, 03:17 PM

Float is set to 5/8 and fuel leaks from carb air intake . BTW when setting the 5/8 float height , is the needle vale susposed to be closed at that setting??

old31 · 06-04-2021, 04:28 PM

Yes, the needle should be closed.

Is it a new needle, preferably a Viton tipped needle? If not, make sure there are not any scratches on the needle.

Are you using one of these to set the height?

https://www.snydersantiqueauto.com/P...earchByKeyword

nkaminar · 06-04-2021, 04:32 PM

I assume Zenith. The float valve should be shut at the 5/8 inch position. See: http://model-a.org/float_valve_float.html

jerrytocci · 06-04-2021, 04:33 PM

I think the valve is repop. How do I test the float ?

jerrytocci · 06-04-2021, 04:34 PM

I have it at 5/8

old31 · 06-04-2021, 04:40 PM

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Shake the float next to your ear. If you hear anything inside, it's bad.

nkaminar · 06-05-2021, 05:34 AM

To be clear, the gasoline level should be at 5/8 inch.

KGBnut · 06-08-2021, 10:48 AM

Often times I find this is due to the jets leaking where they screw into the carburetor. Pull the carb apart, pour some gas into the float bowl and look in the air intake. See if fuel is seeping up around the jets. Some jets have a small gasket, some have a taper fit. Make sure the seats are clean and the gaskets are in good shape.

Ken

johnbuckley · 06-08-2021, 11:53 AM

Zeniths: Causes of leaking
Problem: Remedy
1 Leaking/loose float valve gasket: Tighten/reseal/replace
2 Leaking float valve: (or crud stopping it sealing) Replace ( or clean up if possible )
3 Friction on float hinge: Loosen
4 Incorrectly set fuel level: Re-set
5 Hole in float: Repair or replace
6 Too many gaskets on main jet Check
7 Cap jet or main jet too short: Replace
8 Leaking/loose gasket at main jet: Tighten/reseal/ replace
9 Leaking /loose gasket at cap jet: Tighten/replace
10 Leaking or loose GAV housing threads: Tighten/ reseal/ replace
11 Leak at fuel inlet union: Tighten/reseal/replace
12 Loose/leaking gasket at strainer: Tighten/reseal/replace
13 Loose/leaking gasket at drain plug: Tighten/reseal/replace
14 Cracked housing/leaking passage plugs: Repair or replace

1-7 will generally manifest as poor running.
8-14 will generally not affect running unless there is excessive leaking

06-04-2021, 03:17 PM	#1
jerrytocci Senior Member Join Date: Aug 2020 Posts: 235	fuel leaks from carb intake Float is set to 5/8 and fuel leaks from carb air intake . BTW when setting the 5/8 float height , is the needle vale susposed to be closed at that setting??

06-04-2021, 04:28 PM	#2
old31 Senior Member Join Date: Jan 2016 Posts: 2,093	Re: fuel leaks from carb intake Yes, the needle should be closed. Is it a new needle, preferably a Viton tipped needle? If not, make sure there are not any scratches on the needle. Are you using one of these to set the height? https://www.snydersantiqueauto.com/P...earchByKeyword

06-04-2021, 04:32 PM	#3
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,897	Re: fuel leaks from carb intake I assume Zenith. The float valve should be shut at the 5/8 inch position. See: http://model-a.org/float_valve_float.html __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

06-04-2021, 04:33 PM	#4
jerrytocci Senior Member Join Date: Aug 2020 Posts: 235	Re: fuel leaks from carb intake I think the valve is repop. How do I test the float ?

06-04-2021, 04:34 PM	#5
jerrytocci Senior Member Join Date: Aug 2020 Posts: 235	Re: fuel leaks from carb intake I have it at 5/8

06-04-2021, 04:40 PM	#6
old31 Senior Member Join Date: Jan 2016 Posts: 2,093	Re: fuel leaks from carb intake Sponsored Links (Register now to hide all advertisements) Shake the float next to your ear. If you hear anything inside, it's bad.

06-05-2021, 05:34 AM	#7
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,897	Re: fuel leaks from carb intake To be clear, the gasoline level should be at 5/8 inch. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

06-08-2021, 10:48 AM	#8
KGBnut Senior Member Join Date: Jul 2011 Location: Southwestern Connecticut Posts: 931	Re: fuel leaks from carb intake Often times I find this is due to the jets leaking where they screw into the carburetor. Pull the carb apart, pour some gas into the float bowl and look in the air intake. See if fuel is seeping up around the jets. Some jets have a small gasket, some have a taper fit. Make sure the seats are clean and the gaskets are in good shape. Ken __________________ Style beats speed any day, and with a lot fewer tickets.

06-08-2021, 11:53 AM	#9
johnbuckley Senior Member Join Date: Jul 2010 Location: United Kingdom Posts: 1,441	Re: fuel leaks from carb intake Zeniths: Causes of leaking Problem: Remedy 1 Leaking/loose float valve gasket: Tighten/reseal/replace 2 Leaking float valve: (or crud stopping it sealing) Replace ( or clean up if possible ) 3 Friction on float hinge: Loosen 4 Incorrectly set fuel level: Re-set 5 Hole in float: Repair or replace 6 Too many gaskets on main jet Check 7 Cap jet or main jet too short: Replace 8 Leaking/loose gasket at main jet: Tighten/reseal/ replace 9 Leaking /loose gasket at cap jet: Tighten/replace 10 Leaking or loose GAV housing threads: Tighten/ reseal/ replace 11 Leak at fuel inlet union: Tighten/reseal/replace 12 Loose/leaking gasket at strainer: Tighten/reseal/replace 13 Loose/leaking gasket at drain plug: Tighten/reseal/replace 14 Cracked housing/leaking passage plugs: Repair or replace 1-7 will generally manifest as poor running. 8-14 will generally not affect running unless there is excessive leaking

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