The Ford Barn

Clem Clement · 02-08-2015, 09:43 PM

You know sometimes when our are watching a procedure something doesn't look right but yer head isn't in the game. I watched a fellow try and start his A by pumping the gas petal. I'm thinking...hhhmmmmmmm.
in the middle of the night I'm up pumping does not add extra gas as there is no accelerating pump. Maybe the interruption of flow helps but probably the lose of a steady flow of fuel/air mixture is reduced. I'm getting slower that the speed of stink. Time to watch the Grammy's

Joe K · 02-08-2015, 09:57 PM

It's possible that "pumping" the throttle plate while cranking the engine may set up oscillation in the fuel tube which MIGHT dislodge some obstruction to fuel flow. But the relief may be only temporary, and the effect would be more substantial using the choke similarly.

Joe K

pooch · 02-08-2015, 09:59 PM

If you think it is flooded you would hold the gas pedal down .

Pumping it does nothing but interrupt the amount of air that passes the venturi.

Tom Wesenberg · 02-08-2015, 10:11 PM

I've seen a couple people not only pump the gas pedal, but they also pump the choke rod. I just grin and keep my mouth shut. They eventually get the engine started.

Mitch//pa · 02-08-2015, 10:14 PM

sometimes nerves cause that

or if you need to go to the bathroom

tbirdtbird · 02-08-2015, 10:17 PM

Sponsored Links (Register now to hide all advertisements)

"pumping does not add extra gas as there is no accelerating pump"

Bingo !!

maybe the guy forgot to take his medications

jmeckel · 02-08-2015, 10:21 PM

It may help a slipping muffler belt!! LOL

silversink · 02-08-2015, 11:47 PM

it makes them feel good-----lighten up hahaha

Mike V. Florida · 02-08-2015, 11:53 PM

Old habits die hard.

Chuck Sea/Tac · 02-09-2015, 01:30 AM

Quote:

Originally Posted by tbirdtbird

"pumping does not add extra gas as there is no accelerating pump"

Bingo !!

maybe the guy forgot to take his medications

If the engine is being cranked, then you are adding gas thru the Venturi effect, right.

C26Pinelake · 02-09-2015, 02:36 AM

If that is the way they like to do it let it be. It won't hurt anything and it provides humor ! Why let it bother you ? Wayne

pooch · 02-09-2015, 02:42 AM

Not so sure about no damage.

I start an A with no throttle and full retard and a flick of the choke.

If this dude was pumping the throttle he could have a lot of air and gas in the cylinders, and if he also is ignorant on starting procedures, he may also have the spark lever down.

A full gutful of gas and air and spark advanced .....and then a back fire occurs....

Will be a nice shock to the bendix .

tbirdtbird · 02-09-2015, 10:57 AM

pumping the pedal to activate the (non-existent) accel pump and holding the throttle open at a certain position to gain venturi effect are two very different things

Cool Hand Lurker · 02-09-2015, 11:30 AM

Even with modern fuel injected cars you don't have to pump the accelerator.
Unless of course, you want to get more air into the cylinders first to raise the compression to start the engine quicker.....

Purdy Swoft · 02-09-2015, 11:40 AM

Pumping the pedal is a clear sign that the person knows nothing about the model A .

Mitch//pa · 02-09-2015, 11:41 AM

Quote:

Originally Posted by Cool Hand Lurker

Even with modern fuel injected cars you don't have to pump the accelerator.
Unless of course, you want to get more air into the cylinders first to raise the compression to start the engine quicker.....

on a fuel injected car if you hold it to the floor when cranking its in "clear flood mode" and will stop the injectors from spraying fuel

Cool Hand Lurker · 02-09-2015, 04:23 PM

Quote:

Originally Posted by Cool Hand Lurker

Even with modern fuel injected cars you don't have to pump the accelerator.
Unless of course, you want to get more air into the cylinders first to raise the compression to start the engine quicker.....

Unless of course, you want to get more air into the cylinders first to raise the compression to start the engine quicker.....

Didn't anybody catch the humor in that? Like pumping the accelerator in a Model A to get more air into the cylinders? Too subtle eh?

Bruce Lancaster · 02-09-2015, 04:29 PM

Venturi effect is going to be right about zero at cranking speed...
On an A or B, the choke is spring-loaded, meant to return to open when you release the knob. This is usually used briefly at first crank to get some gas moving up from float level to the available apertures and get the thing to fire. If engine is cold, the necessary enrichment is handled by an enrichment valve opened by rotating the choke knob...unlike most later cars with choke, the choke is not used for enrichment while driving cold because said valve handles that job and the choke itself is open as soon as you let go of it.

pooch · 02-09-2015, 04:43 PM

Quote:

Originally Posted by Cool Hand Lurker

Unless of course, you want to get more air into the cylinders first to raise the compression to start the engine quicker.....

Didn't anybody catch the humor in that? Like pumping the accelerator in a Model A to get more air into the cylinders? Too subtle eh?

Maybe I am getting you wrong...

But opening the butterfly does raise compression when cranking the engine .

tbirdtbird · 02-09-2015, 04:45 PM

"Unless of course, you want to get more air into the cylinders first to raise the compression to start the engine quicker....."

Rats, that is how you do it! All this time I have been holding a zip lock bag over the air intake to do this....wondered why it didn't work so good

02-08-2015, 09:43 PM	#1
Clem Clement Senior Member Join Date: May 2010 Location: Fairfax, VA Posts: 3,393	Pumping gas pedal You know sometimes when our are watching a procedure something doesn't look right but yer head isn't in the game. I watched a fellow try and start his A by pumping the gas petal. I'm thinking...hhhmmmmmmm. in the middle of the night I'm up pumping does not add extra gas as there is no accelerating pump. Maybe the interruption of flow helps but probably the lose of a steady flow of fuel/air mixture is reduced. I'm getting slower that the speed of stink. Time to watch the Grammy's

02-08-2015, 09:57 PM	#2
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: Pumping gas pedal It's possible that "pumping" the throttle plate while cranking the engine may set up oscillation in the fuel tube which MIGHT dislodge some obstruction to fuel flow. But the relief may be only temporary, and the effect would be more substantial using the choke similarly. Joe K __________________ Shudda kept the horse.

02-08-2015, 09:59 PM	#3
pooch Senior Member Join Date: Sep 2010 Location: South Coast NSW Australia Posts: 2,596	Re: Pumping gas pedal If you think it is flooded you would hold the gas pedal down . Pumping it does nothing but interrupt the amount of air that passes the venturi.

02-08-2015, 10:11 PM	#4
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Pumping gas pedal I've seen a couple people not only pump the gas pedal, but they also pump the choke rod. I just grin and keep my mouth shut. They eventually get the engine started.

02-08-2015, 10:14 PM	#5
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Pumping gas pedal sometimes nerves cause that or if you need to go to the bathroom Last edited by Mitch//pa; 02-08-2015 at 10:21 PM.

02-08-2015, 10:17 PM	#6
tbirdtbird BANNED Join Date: May 2012 Location: inside your RAM Posts: 3,134	Re: Pumping gas pedal Sponsored Links (Register now to hide all advertisements) "pumping does not add extra gas as there is no accelerating pump" Bingo !! maybe the guy forgot to take his medications __________________ '31 180A

02-08-2015, 10:21 PM	#7
jmeckel Senior Member Join Date: Sep 2011 Location: Luck WI Posts: 550	Re: Pumping gas pedal It may help a slipping muffler belt!! LOL __________________ Jon "If you choose to not decide, you still have made a choice!" RUSH Don't tell me what you know..... Tell me what you have done.

02-08-2015, 11:47 PM	#8
silversink Senior Member Join Date: Nov 2011 Location: Dayton Oregon Posts: 318	Re: Pumping gas pedal it makes them feel good-----lighten up hahaha __________________ Hotrods don't have valve covers

02-08-2015, 11:53 PM	#9
Mike V. Florida Senior Member Join Date: May 2010 Location: South Florida Posts: 14,054	Re: Pumping gas pedal Old habits die hard. __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II

02-09-2015, 02:36 AM	#11
C26Pinelake BANNED Join Date: May 2010 Location: Michigan / Ontario border, Sarnia, Ontario. 50 miles from Detroit and 150 from Toronto. Posts: 5,800	Re: Pumping gas pedal If that is the way they like to do it let it be. It won't hurt anything and it provides humor ! Why let it bother you ? Wayne

02-09-2015, 02:42 AM	#12
pooch Senior Member Join Date: Sep 2010 Location: South Coast NSW Australia Posts: 2,596	Re: Pumping gas pedal Not so sure about no damage. I start an A with no throttle and full retard and a flick of the choke. If this dude was pumping the throttle he could have a lot of air and gas in the cylinders, and if he also is ignorant on starting procedures, he may also have the spark lever down. A full gutful of gas and air and spark advanced .....and then a back fire occurs.... Will be a nice shock to the bendix .

02-09-2015, 10:57 AM	#13
tbirdtbird BANNED Join Date: May 2012 Location: inside your RAM Posts: 3,134	Re: Pumping gas pedal pumping the pedal to activate the (non-existent) accel pump and holding the throttle open at a certain position to gain venturi effect are two very different things __________________ '31 180A

02-09-2015, 11:30 AM	#14
Cool Hand Lurker Senior Member Join Date: May 2010 Location: So Minn Posts: 1,565	Re: Pumping gas pedal Even with modern fuel injected cars you don't have to pump the accelerator. Unless of course, you want to get more air into the cylinders first to raise the compression to start the engine quicker.....

02-09-2015, 11:40 AM	#15
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Pumping gas pedal Pumping the pedal is a clear sign that the person knows nothing about the model A .

02-09-2015, 04:29 PM	#18
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: Pumping gas pedal Venturi effect is going to be right about zero at cranking speed... On an A or B, the choke is spring-loaded, meant to return to open when you release the knob. This is usually used briefly at first crank to get some gas moving up from float level to the available apertures and get the thing to fire. If engine is cold, the necessary enrichment is handled by an enrichment valve opened by rotating the choke knob...unlike most later cars with choke, the choke is not used for enrichment while driving cold because said valve handles that job and the choke itself is open as soon as you let go of it.

02-09-2015, 04:45 PM	#20
tbirdtbird BANNED Join Date: May 2012 Location: inside your RAM Posts: 3,134	Re: Pumping gas pedal "Unless of course, you want to get more air into the cylinders first to raise the compression to start the engine quicker....." Rats, that is how you do it! All this time I have been holding a zip lock bag over the air intake to do this....wondered why it didn't work so good __________________ '31 180A