Time to replace the carb?
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Elder User
Joined: Mar 2008
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From: Central Florida
Time to replace the carb?
So I noticed a steady fuel leak underneath my carb's accel pump and decided to take the carb off and take a better look. While messing with the screws I noticed one screw just spun and never tighten. It seems as if the screw hole has lost its threads. Is it a sign to replace the carb? Or can I buy a part to replace this side of the carb? I'm 80% sure the carb is a Holley 4180.
I've drew a red circle around the screw with the issue.
I've drew a red circle around the screw with the issue.
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From: Northeast, OK
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Elder User
Joined: Mar 2008
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From: Central Florida
That does look like a 4180. You can replace the float bowl, which is what that screw goes into. Here's a link to one. But, for that kind of money you can probably find another 4180 as they aren't highly sought after.
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From: Northeast, OK
Well, in my opinion all Holleys leak. Or, maybe I should say all old Holleys leak as I'm told the new ones don't leak. But I don't see why the 4180 would leak more than a 4160 or any other Holley for that matter.
As the casting says, it was made by Holley for Motorcraft. From what little I know of them Ford redesigned the standard Holley to fit their needs, but most components like the accelerator pumps and power valves interchange.
As the casting says, it was made by Holley for Motorcraft. From what little I know of them Ford redesigned the standard Holley to fit their needs, but most components like the accelerator pumps and power valves interchange.
Laughing Gas
Joined: Apr 2013
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You could try tapping some new threads for a little larger screw into the wallowed out hole.
In fact in the top picture you posted (which I'm assuming was used for illustration and is not actually a picture of your carb) it looks like the lower right hand screw is an oversized replacement. Kind of ironic, in a way...
In fact in the top picture you posted (which I'm assuming was used for illustration and is not actually a picture of your carb) it looks like the lower right hand screw is an oversized replacement. Kind of ironic, in a way...
pedant
Joined: Jan 2008
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From: EXTREME southwest CT
OEM's needed 'tamperproof emissions' in order to meet EPA regulations.
Capped idle mixture screws, breakaway choke cap screws, two stage powervalve, vented float bowls and a metering plate instead of replaceable jets are the things I can think of that differentiate it from a 4160.
It does have the nice annular boosters in both primary and secondary.
Accelerator pump diaphragms do tend leak after a while. and hamfisted owners crank the screws trying to stop the weep, instead of just replacing them.
I would bet the cover is now warped and will never seal right.
Ask Bill Vose how to straighten it out with a plastic hammer and a surface plate...
They DO make Helicoils that small!
Because I think I bought the very last 4180 primary bowl on the planet.
so, no. I don't think you can buy that part. (at least through normal Ford supply channels)
Capped idle mixture screws, breakaway choke cap screws, two stage powervalve, vented float bowls and a metering plate instead of replaceable jets are the things I can think of that differentiate it from a 4160.
It does have the nice annular boosters in both primary and secondary.
Accelerator pump diaphragms do tend leak after a while. and hamfisted owners crank the screws trying to stop the weep, instead of just replacing them.
I would bet the cover is now warped and will never seal right.
Ask Bill Vose how to straighten it out with a plastic hammer and a surface plate...
They DO make Helicoils that small!
Because I think I bought the very last 4180 primary bowl on the planet.
so, no. I don't think you can buy that part. (at least through normal Ford supply channels)
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Take it apart and look down the hole. There may be some extra threads down in there, and a little bit longer screw may work. You may have to take a longer screw and use one of those wire strippers with the screw cutter to get it exactly right to make it work.
All old carbs should have a kit put in them. The fuel with the alcohol in it hates the old carbs with the old rubber parts in them. And that's all you can buy now, ethanol, and they keep raising the amount they put in it. Most of the corn fields you see now are being harvested for fuel use instead of food use.
All old carbs should have a kit put in them. The fuel with the alcohol in it hates the old carbs with the old rubber parts in them. And that's all you can buy now, ethanol, and they keep raising the amount they put in it. Most of the corn fields you see now are being harvested for fuel use instead of food use.
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
I forgot about warped pump covers. You really do need to check for warpage as a warped cover won't seal, as Jim said. I've been able to sand them flat by using sandpaper on a piece of plate glass.
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FTE Legend
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From: Northeast, OK
True, on both counts. A badly warped cover might require removal of the ridge to flatten and that wouldn't be good. Do the covers interchange with other Holleys?
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Elder User
Joined: Mar 2008
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From: Central Florida
You could try tapping some new threads for a little larger screw into the wallowed out hole.
In fact in the top picture you posted (which I'm assuming was used for illustration and is not actually a picture of your carb) it looks like the lower right hand screw is an oversized replacement. Kind of ironic, in a way...
In fact in the top picture you posted (which I'm assuming was used for illustration and is not actually a picture of your carb) it looks like the lower right hand screw is an oversized replacement. Kind of ironic, in a way...
Accelerator pump diaphragms do tend leak after a while. and hamfisted owners crank the screws trying to stop the weep, instead of just replacing them.
I would bet the cover is now warped and will never seal right.
Ask Bill Vose how to straighten it out with a plastic hammer and a surface plate...
They DO make Helicoils that small!
I would bet the cover is now warped and will never seal right.
Ask Bill Vose how to straighten it out with a plastic hammer and a surface plate...
They DO make Helicoils that small!
Thread Starter
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Elder User
Joined: Mar 2008
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From: Central Florida
Taking the accel pump cap and diaphragm off to take to Autozone see if they carry replacements. The diaphragm itself appears to still be good, but for safe measures i'll get a replacement. Hopefully they sell helicoils small enough for the holes.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
P/N 26-139 for the cover.
P/N 135-12 for the diapghram w/ new screws.
https://www.holley.com/types/Acceler...ce%20Parts.asp
P/N 135-12 for the diapghram w/ new screws.
https://www.holley.com/types/Acceler...ce%20Parts.asp
Thread Starter
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Elder User
Joined: Mar 2008
Posts: 509
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From: Central Florida
P/N 26-139 for the cover.
P/N 135-12 for the diapghram w/ new screws.
https://www.holley.com/types/Acceler...ce%20Parts.asp
P/N 135-12 for the diapghram w/ new screws.
https://www.holley.com/types/Acceler...ce%20Parts.asp