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07-23-2020, 01:22 PM | #1 |
Member
Join Date: Mar 2012
Posts: 42
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running erratic
I recently aquired a 1951 Ford Custom 2dr. V8 3spd. The car starts right up, however, it stumbles. It runs better with the choke part way out. Any help would be greatly appreciated.Thanks.
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07-23-2020, 02:12 PM | #2 |
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Join Date: Jul 2014
Location: Iowa
Posts: 1,634
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Re: running erratic
Check fuel flow to the carb as the engine is cranked by removing the line from the carb and placing it on a container to catch the fuel. If the flow is low or uneven, there is an obstruction in the line, or at the pickup in the tank. If the flow is good, the carb is the culprit, and will likely need adjustment or a rebuild. If the gas is old or contains particles,
the tank or line is probably rusted. If you have any flexible parts in the fuel line, such as between the pump and carb, the interior of that part may have been compromised by alcohol containing fuel, causing an internal collapse restricting flow. |
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07-23-2020, 02:22 PM | #3 |
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Join Date: May 2015
Posts: 8,074
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Re: running erratic
Has the your "recently acquired" car been sitting in storage or unused for a long period of time? After a long winters nap, my '53 was awakened to a nasty fuel delivery problem - terrible hesitation and rough idling. I was going to replace the carb with a spare but decided to use some Chevron Techron Concentrate Plus fuel additive/conditioner that I purchased from O'Reilly's first. The result was impressive as it resolved the problems.... I drove the car around for about 10-15 minutes and the carb cleared right up. Its been running fine ever since. I'm impressed with this stuff....
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__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 Last edited by petehoovie; 07-23-2020 at 02:39 PM. |
07-23-2020, 02:42 PM | #4 |
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Join Date: Mar 2012
Posts: 42
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Re: running erratic
I forgot to mention, the car has an electric fuel pump, and was on the road last year.
I also used two cans of Seafoam gas treatment. |
07-23-2020, 03:01 PM | #5 |
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Join Date: May 2010
Location: san antonio, texas
Posts: 461
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Re: running erratic
if it stumbles, make sure the accelerator pump is working. carb might need to be rebuilt...
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07-23-2020, 03:14 PM | #6 | |
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Location: Jacksonville FL
Posts: 3,946
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Re: running erratic
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Quote:
ALSO you may want to look back in the archives BUT with "electric fuel pumps" you "MAY" also look at what the PSI is the electric fuel pump pumping at.....IF memory serves me.....you should be around 3-4 psi from a stock pump and "MOST" electric pumps are 6-8 psi SO that could be an issue as well SO IF you plan on keeping the electric pump in your system then you may want to look at a pressure gauge and/or a pressure "regulator" as well!!!! Last edited by rockfla; 07-23-2020 at 03:35 PM. |
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07-24-2020, 12:18 PM | #7 |
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Join Date: Mar 2012
Posts: 42
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Re: running erratic
Thank you for all the replies. I will let you know how this turns out!
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07-30-2020, 02:14 PM | #8 |
Member
Join Date: Mar 2012
Posts: 42
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Re: running erratic
A new carb swap cured the erratic idle. Now...I cannot get motor to idle down unless I physically move the linkage. I have lubricated ALL the linkage parts/joints. I lubricated the bottom of the gas pedal. The carpet is NOT touching the linkage, The return spring is still functioning on the firewall. I cannot find a location where the linkage may be binding. Any thoughts would be appreciated.
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07-30-2020, 03:33 PM | #9 |
Senior Member
Join Date: May 2010
Posts: 886
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Re: running erratic
try backing off the Idle adj. screw on the throttle shaft where it connects to the linkage, also you may have some mis-aligned butterfly plates allowing the throttle shaft to bind allowing the fuel air mixture to pass through .
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