|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
03-18-2020, 08:21 PM | #1 |
Member
Join Date: Feb 2020
Location: Glendora, Calif..
Posts: 56
|
Zenith-ll carburetor question
I have a Zenith-ll carburetor on the 28 and I have a problem with it leaking through the intake. The A runes great when I take it out for a drive and then when I come back and park it, the carb doesn’t leek for hours, then I’ll check it the next morning and it has leaked. Every time I get done driving it I shut the gas off from the the tank. So I’m not sure if the float is sticking or if it could be something else...?
Doug |
03-18-2020, 08:43 PM | #2 |
Senior Member
Join Date: Oct 2019
Location: Washington
Posts: 175
|
Re: Zenith-ll carburetor question
Probably the float valve. If it leaks slowly it takes somtime to overflow the float bowl, I had this problem just last week.
|
Sponsored Links (Register now to hide all advertisements) |
|
03-18-2020, 08:48 PM | #3 |
Senior Member
Join Date: Oct 2019
Location: Washington
Posts: 175
|
Re: Zenith-ll carburetor question
Dougs 28, Read the article by Tom Endy on Zenith carburetor restoration tips, that helped me tremendously. Mine is working great now.
|
03-18-2020, 09:18 PM | #4 |
Senior Member
Join Date: May 2016
Location: Scottsdale, Arizona
Posts: 612
|
Re: Zenith-ll carburetor question
Good Evening...Sometimes this leak is a combination of a leak in the shut off valve under the dash combined with the float valve and the head pressure coming from the dribble of the under dash valve. A quarter turn shut off valve from Bratton's that will not leak can sometimes/often cure the problem of the two old fashioned valves dribbling tiny amounts of fuel...Ernie in Arizona
|
03-18-2020, 09:21 PM | #5 |
Senior Member
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 7,496
|
Re: Zenith-ll carburetor question
If the jets are not installed at the right height (ie, too low), fuel will run through them if the float valve and tap leak.
__________________
I'm part of the only ever generation with an analogue childhood and a digital adulthood. |
03-18-2020, 09:27 PM | #6 |
Senior Member
Join Date: May 2010
Location: brentwood, ca
Posts: 4,245
|
Re: Zenith-ll carburetor question
Sponsored Links (Register now to hide all advertisements)
|
03-18-2020, 09:40 PM | #7 |
Member
Join Date: Feb 2020
Location: Glendora, Calif..
Posts: 56
|
Re: Zenith-ll carburetor question
Thanks for the info, guys, I’ll check out Tom Endy’s article on Zenith Carburetors and go from there. Appreciate the advise..
Doug |
03-18-2020, 09:58 PM | #8 | |
Senior Member
Join Date: Jan 2019
Location: Florida Panhandle
Posts: 585
|
Re: Zenith-ll carburetor question
Quote:
|
|
03-18-2020, 10:13 PM | #9 |
Senior Member
Join Date: Oct 2019
Location: Washington
Posts: 175
|
Re: Zenith-ll carburetor question
You should be able to leave the tank valve on all the time, even if it leaks. the float valve should keep gas from leaking so if you have a carburetor leak the float valve is bad. I would still change the tank valve if its bad. I do shut off the tank valve when the car is going to sit for awhile just in case the float valve fails.
|
03-18-2020, 10:28 PM | #10 |
Senior Member
Join Date: Jun 2017
Location: Walla Walla, WA
Posts: 1,045
|
Re: Zenith-ll carburetor question
A while back I bought an electric shut-off valve so I didn't have to worry about it. I still shut off the manual tank valve when I park for long periods of time. However, even before that I never had any carb leakage when leaving the tank valve on. I guess I should call myself lucky.
|
03-18-2020, 10:52 PM | #11 |
Senior Member
Join Date: Aug 2010
Location: Port Orchard, WA
Posts: 1,498
|
Re: Zenith-ll carburetor question
I have found that the float can contribute to the problem. You need to inspect carburetor float hinge bracket, frequently the float valve needle will wear a dimple in the hinge bracket and the dimple will impede the float travel and thus not completely seat the needle in the float valve. See the below photos of two floats with dimples from years of contact with the float valve needle.
I have sanded the bracket to remove the dimple.
__________________
1931 160B & 1931 68B If you don't have time to do it right the 1st time, how do you have time to do it the 2nd time? Last edited by 160B; 03-18-2020 at 11:02 PM. |
03-19-2020, 07:26 PM | #12 | |
Senior Member
Join Date: Sep 2016
Location: Kingston N>Y>
Posts: 121
|
Re: Zenith-ll carburetor question
Quote:
|
|
03-20-2020, 09:54 AM | #13 |
Senior Member
Join Date: Aug 2018
Posts: 2,332
|
Re: Zenith-ll carburetor question
I like to isolate 1st. Turn off the shutoff, take gas line off at carb, let gas line drain dry for a couple of hours, stick a small jar with a piece of paper/tissue in the jar under the free end of the gas line and let sit overnight. If gas in the jar, or paper is stained, fix the shutoff. Put the gas line back on the carb, test overnight with the shutoff off, check the carb air intake for gas Turn on shutoff on and leave overnight, if leaks fix carb.
|
03-20-2020, 08:02 PM | #14 |
Junior Member
Join Date: Nov 2016
Posts: 25
|
Re: Zenith-ll carburetor question
My Zenith II has gas that wicks up the wall of the inside of the carb. and runs over at the gasket surface. No opne has been able to solve that problem for me yet.
|
03-21-2020, 04:42 AM | #15 |
Senior Member
Join Date: Jul 2010
Location: United Kingdom
Posts: 1,443
|
Re: Zenith-ll carburetor question
Why not make that a sepearte thread- you'd have lots of opinions I'm sure- Maybe be even some useful stuff
|
03-21-2020, 07:41 AM | #16 |
Senior Member
Join Date: May 2010
Posts: 2,597
|
Re: Zenith-ll carburetor question
double post ...
|
03-21-2020, 07:43 AM | #17 |
Senior Member
Join Date: May 2010
Posts: 2,597
|
Re: Zenith-ll carburetor question
,,,
Last edited by Benson; 04-11-2020 at 07:55 AM. Reason: clarification of text |
|
|
Sponsored Links (Register now to hide all advertisements) |
|