AFB acclerator pump
#1863159
07/03/15 11:34 PM
07/03/15 11:34 PM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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The carb on my latest purchase will not pump gas through the jets and will not start without being primed after sitting overnight. I assume the accelerator pump is not working but not sure. If it is the pump what should I look for as the likely cause and are they easy to fix?
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: AFB acclerator pump
[Re: dfsmopars]
#1863164
07/03/15 11:40 PM
07/03/15 11:40 PM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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It all depends on your mechanical abilities. If you have a decent mechanical aptitude there is nothing difficult about changing any aspect of an AFB, pretty basic carburetor. A total lack of fuel is not usually an accelerator pump issue, it's likely a float or needle and seat issue, or something outside the carb restricting fuel. Overnight fuel dissipation is common with todays fuel, most likely it's just evaporating, an electric fuel pump will compensate for that.
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Re: AFB acclerator pump
[Re: dfsmopars]
#1863252
07/04/15 01:45 AM
07/04/15 01:45 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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The carb on my latest purchase will not pump gas through the jets and will not start without being primed after sitting overnight. thru the AP nozzle (squirters) I am assuming you are meanin. (1) when you shut it down for the night before you go inside, pull the air cleaner & pull the throttle under the hood & see if you have immediate tip in & a healthy stream duration/amount (2) the next AM before you crank it, same thing, see what you have for a stream. If (1) is good & (2) ain't then its evaporating from too much heat soak. If (1) ain't right then pull the rods/carb top & see what is up with the pump plunger assy. it should grab ~halfway down the bore. there just was a thread where the check valve for the pump well was not doing its job. dont remember if the well was not filling or if the check ball was not letting the fuel being pushed out to the squirter but it was the check valve. EDIT & there is a check valve (ball bearing or long needle valve) under the squirter also
Last edited by RapidRobert; 07/04/15 02:20 AM.
live every 24 hour block of time like it's your last day on earth
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Re: AFB acclerator pump
[Re: dfsmopars]
#1866268
07/08/15 12:26 AM
07/08/15 12:26 AM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
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Posts: 2,356
Kentucky
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Took the top off the carb and the accelerator pump is the leather type. Tried to use it manually with fuel in the bowl and with the squirters off and got no fuel up to the squirters' holes. Even tried blowing air through the passage and got nothing. Should I be able to pass something from the base, through the passage and up to the squirters? The carb runs nice all except for not getting any fuel to the squirters right now.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: AFB acclerator pump
[Re: dfsmopars]
#1866275
07/08/15 12:32 AM
07/08/15 12:32 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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[quote] Should I be able to pass something from the base, through the passage and up to the squirters? [quote/] yes, its plugged
live every 24 hour block of time like it's your last day on earth
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Re: AFB acclerator pump
[Re: dfsmopars]
#1866314
07/08/15 01:42 AM
07/08/15 01:42 AM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Pull the squirter nossle off and see if you can see the brass check valve under the nossle, if so try squirting a little WD 40 or Liquid Wrench on top of the check valve, let it sit for 5 to 10 minutes and see if it will come loose by filling the accelerator pump well and try squirting it with the accelerator pump manually If it is stuck in there, gummed up with varnish, you may need to take the carb. off the intake and get a squirt can of carb. cleaner and try and clean the gum and varnish out of that passage to free that check valve. Once the check valve is freed up and falls in and out of that passage easily it should work properly I use a thin blade scewdriver to move the leather out and around the spring to help it pump better also I have a AVS on a motor right now that has a poor stream of fuel, I didn't presoak the pump or try moving the leather skirt out I will in the morning before running that motor again on the dyno tomorrow
Last edited by Cab_Burge; 07/08/15 01:43 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: AFB acclerator pump
[Re: Cab_Burge]
#1866404
07/08/15 08:43 AM
07/08/15 08:43 AM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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Pull the squirter nossle off and see if you can see the brass check valve under the nossle, if so try squirting a little WD 40 or Liquid Wrench on top of the check valve, let it sit for 5 to 10 minutes and see if it will come loose by filling the accelerator pump well and try squirting it with the accelerator pump manually If it is stuck in there, gummed up with varnish, you may need to take the carb. off the intake and get a squirt can of carb. cleaner and try and clean the gum and varnish out of that passage to free that check valve. Once the check valve is freed up and falls in and out of that passage easily it should work properly I use a thin blade scewdriver to move the leather out and around the spring to help it pump better also I have a AVS on a motor right now that has a poor stream of fuel, I didn't presoak the pump or try moving the leather skirt out I will in the morning before running that motor again on the dyno tomorrow The check valve is free. Now that the gunk is out of the way it is easy to see what is going on. Soaked the leather in WD40 and mannually gave it a few pumps and the squirters are doing their thing. Hopefully get time before the end of the week to re-install the carb and prove the fix. Thanks for everyone's help.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: AFB acclerator pump
[Re: Paul_Fancsali]
#1866600
07/08/15 02:53 PM
07/08/15 02:53 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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maybe I missed it but was the passage blocked or was it the check valve under the squirter that was stuck? on a leather plunger what Cab said run a screwdriver inbetween the spring and the leather around it to expand it & I would oil the leather to make it supple/fit better
live every 24 hour block of time like it's your last day on earth
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Re: AFB acclerator pump
[Re: RapidRobert]
#1866820
07/08/15 07:27 PM
07/08/15 07:27 PM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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maybe I missed it but was the passage blocked or was it the check valve under the squirter that was stuck? on a leather plunger what Cab said run a screwdriver inbetween the spring and the leather around it to expand it & I would oil the leather to make it supple/fit better The check valve was stuck. Once it was free all was good. I did take cab's advice and massaged the spring and leather. I also soaked it in WD40. Re-installed the carb, turned the 413 over several times to fill the bowls, confirmed the squirters to be doing their thing and fired it up. No rebuild kit yet. It seems to be running fine. 😎🙏
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: AFB acclerator pump
[Re: Paul_Fancsali]
#1866823
07/08/15 07:29 PM
07/08/15 07:29 PM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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The valve was up top under the squirter body.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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