Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 08-27-2019, 05:22 PM   #1
Steves46
Senior Member
 
Steves46's Avatar
 
Join Date: May 2010
Location: Lithia, FL
Posts: 929
Default Gas Shut Off Valve

I really enjoy driving my Model A as much as I can and have a question regarding the gas shut-off valve. Is it absolutley necessary to turn it off everytime you shut off the engine or should it be ok to leave it open for an hour or 2, like going to a car show or making a few stops during the day? Thanks.
__________________
If it aint broke, don't fix it!
Steves46 is offline   Reply With Quote
Old 08-27-2019, 05:25 PM   #2
chrs1961815
Senior Member
 
chrs1961815's Avatar
 
Join Date: Jul 2018
Location: Spring Grove, Illinois
Posts: 493
Default Re: Gas Shut Off Valve

It is not absolutely necessary for short drives like that. It does of course depend on how well the valve actually works. If it doesn't work well, your carb will fill up and might leak which is why people turn it off in the first place.
__________________
"The more things change, the more they stay the same."
chrs1961815 is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 08-27-2019, 05:29 PM   #3
Synchro909
Senior Member
 
Synchro909's Avatar
 
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 4,481
Default Re: Gas Shut Off Valve

Quote:
Originally Posted by chrs1961815 View Post
It is not absolutely necessary for short drives like that. It does of course depend on how well the valve actually works. If it doesn't work well, your carb will fill up and might leak which is why people turn it off in the first place.
The carb will fill up only if the float valve is also faulty. To get fuel leaking from the carb, BOTH valves must let fuel past. Turning off the shutoff is a worthwhile safety measure so long as it seals IMO.
__________________
I wouldn't change any of my kids or grandkids for the world but I'd like to change the world for them.
Synchro909 is offline   Reply With Quote
Old 08-27-2019, 05:34 PM   #4
Steves46
Senior Member
 
Steves46's Avatar
 
Join Date: May 2010
Location: Lithia, FL
Posts: 929
Default Re: Gas Shut Off Valve

Thanks guys. The valve works fine rather just saving wear & tear.
__________________
If it aint broke, don't fix it!
Steves46 is offline   Reply With Quote
Old 08-27-2019, 05:34 PM   #5
NZ28ModelA
Member
 
NZ28ModelA's Avatar
 
Join Date: Jan 2018
Location: Wellington, New Zealand
Posts: 78
Default Re: Gas Shut Off Valve

I have never had any issues when I have left the tap on with day to day driving and stopping of an hour or two. As Syncro states, its the float valve in the carby that is stopping the fuel from continuously flowing when the fuel bowl is full.
NZ28ModelA is offline   Reply With Quote
Old 08-28-2019, 07:51 AM   #6
1928Mik
Senior Member
 
1928Mik's Avatar
 
Join Date: Feb 2017
Location: Zanesville Ohio USA
Posts: 139
Default Re: Gas Shut Off Valve

Yeah, no issues. I leave mine open unless I'm shutting down for a long period of time.
__________________
1928 Niagara Blue Phaeton
1972 Olds 442 Convertible
1928Mik is offline   Reply With Quote
Old 08-28-2019, 07:53 AM   #7
ryanheacox
Senior Member
 
ryanheacox's Avatar
 
Join Date: Apr 2013
Location: Northwest CT
Posts: 633
Default Re: Gas Shut Off Valve

Quote:
Originally Posted by Steves46 View Post
Thanks guys. The valve works fine rather just saving wear & tear.

But, does your carb drip if you leave the valve on?
ryanheacox is offline   Reply With Quote
Old 08-28-2019, 08:04 AM   #8
Joe K
Senior Member
 
Joe K's Avatar
 
Join Date: Jul 2010
Location: Cow Hampshire
Posts: 3,394
Default Re: Gas Shut Off Valve

The original Model A Zenith carb had a brass needle - ground to a fine joint between the needle and the seat. Corrosion, corrosion products, crap in the gas tended to keep the needle from its seat and would cause a gas leak. Owners of the day and now tended to "overuse" the gas tank valve as a way to prevent loss of gas.

Today there are at least two brands of "replacement" valves for one's Zenith carburetor. Fit, form, function is all similar to the original. And forgiveness of crap gas is a recommendation.

I don't care for the "multi-ball" version. Too many places to crap up and leak by - which is exactly the opposite of what the manufacturer intended, I'm sure. Probably my most favored is the "viton tipped" needle - if you can find it.

Originally these were made using Buna-N - but the alcohol in the gas now tends to soften Buna-N until the valve "sticks" to its seat. Mostly a problem on initial startup. A John Deere lawn tractor of my familiarity has this issue to this day - a remedial "tap" on the carburetor usually frees it for that day's mowing.

Joe K
__________________
Shudda kept the horse.
Joe K is offline   Reply With Quote
Old 08-28-2019, 08:08 AM   #9
30 Closed Cab PU
Senior Member
 
Join Date: Aug 2018
Location: Wisconsin
Posts: 1,521
Default Re: Gas Shut Off Valve

Quote:
Originally Posted by Steves46 View Post
Thanks guys. The valve works fine rather just saving wear & tear.
A major cause of gas shutoff valve failure is debris from the gas tank getting into the valve. If your gas shutoff is the inside the car under the gas tank style, a pencil filter that is placed into the inlet of the fuel valve helps a lot.


https://modelastore.com/fuel-system?product_id=3884
30 Closed Cab PU is offline   Reply With Quote
Old 08-28-2019, 08:20 AM   #10
mike657894
Senior Member
 
mike657894's Avatar
 
Join Date: Oct 2015
Location: Bay City Michigan
Posts: 969
Default Re: Gas Shut Off Valve

Your use of the valve depends on the seal you get out of your needle and seat in the carb. Carb stays dry and doesn't weep or leak. You can leave it on forever. I cleaned my valve with some diamond polishing paste. Mine was hard to turn as it was over tight to try to seal it and it leaked slightly still. I took it apart to find deep scratches(probably from tank debris) on the sealing surface. Lapped with polish for 20 min till he scratches disappeared. When back together it gets a good seal with minimal tightness and the valve turns very easily. Before you had to grab it just right to get enough force to open it.
mike657894 is offline   Reply With Quote
Old 08-28-2019, 09:34 AM   #11
Purdy Swoft
Senior Member
 
Purdy Swoft's Avatar
 
Join Date: May 2010
Location: Alabama
Posts: 7,424
Default Re: Gas Shut Off Valve

I always close the gas shut off valve when not in use . I think that cutting off the gas when not in use is a good habit .
Purdy Swoft is offline   Reply With Quote
Old 08-29-2019, 09:14 AM   #12
Jeff P. / MN
Senior Member
 
Jeff P. / MN's Avatar
 
Join Date: May 2010
Location: Lakeland, MN
Posts: 238
Default Re: Gas Shut Off Valve

I have always installed an electric fuel shut-off in every Model A I have owned (7 in 40 years). Never had a failure of any sort.
__________________
Jeff P./Mn
1930 Model A Tudor
1913 Model T Runabout
Jeff P. / MN is offline   Reply With Quote
Old 08-29-2019, 11:48 AM   #13
johnbuckley
Senior Member
 
johnbuckley's Avatar
 
Join Date: Jul 2010
Location: United Kingdom
Posts: 1,116
Default Re: Gas Shut Off Valve

Quote:
Originally Posted by Jeff P. / MN View Post
I have always installed an electric fuel shut-off in every Model A I have owned (7 in 40 years). Never had a failure of any sort.
What electrical shut off valve have you fitted? I have alweays thought them a prudent measure but so far I have refrained from fitting them as "they're just something else to go wrong"
johnbuckley is offline   Reply With Quote
Old 08-29-2019, 02:08 PM   #14
1931 flamingo
Senior Member
 
1931 flamingo's Avatar
 
Join Date: May 2010
Location: new britain,ct 06052
Posts: 8,185
Default Re: Gas Shut Off Valve

X2 on the electric shut off. About once a year I would have to disassemble the solenoid and clean due to crap gas. No leakee.
Paul in CT
1931 flamingo is offline   Reply With Quote
Old 08-29-2019, 05:23 PM   #15
Steves46
Senior Member
 
Steves46's Avatar
 
Join Date: May 2010
Location: Lithia, FL
Posts: 929
Default Re: Gas Shut Off Valve

Quote:
Originally Posted by ryanheacox View Post
But, does your carb drip if you leave the valve on?
No sir it doesn't.
__________________
If it aint broke, don't fix it!
Steves46 is offline   Reply With Quote
Old 08-31-2019, 09:31 PM   #16
Jeff P. / MN
Senior Member
 
Jeff P. / MN's Avatar
 
Join Date: May 2010
Location: Lakeland, MN
Posts: 238
Default Re: Gas Shut Off Valve

Quote:
Originally Posted by johnbuckley View Post
What electrical shut off valve have you fitted? I have alweays thought them a prudent measure but so far I have refrained from fitting them as "they're just something else to go wrong"
John, I installed the one on this car in 1998. I sold the car to a friend in 2000 and bought it back from him a year ago. I cannot remember the name of the company that made it but they were in Ohio. I bought several from them in the 90’s and installed them on my 155-c, 400-a, 160-b and this car. I never had a leak or a problem. I always install seat belts, turn signals and electric fuel shut-offs on all my A’s. Anything else installed is “something else to go wrong!”
__________________
Jeff P./Mn
1930 Model A Tudor
1913 Model T Runabout
Jeff P. / MN is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 10:07 AM.