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By darrell - 3 Years Ago
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my neighbor has a 56 with the 4000 carb which is flooding bad fouling his plugs.the car sat of and on for many years.i ordered a kit and was wondering is there anything besides the neddle and seat that causes them to flood.
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By Robs36Ford - 3 Years Ago
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Needle and seat are a main cause, usually just gummed up with old gas gum.
Running too rich can be caused by critters getting on top and clogging the air bleeds in the middle of the top cover, especially when the metal disc is not there.
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By Daniel Jessup - 3 Years Ago
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To add to Robs good advice, another problem - those O rings for the secondary tubes have a tendency to dry out as well. When they do, the tubes will leak extra fuel even when the secondary butterflies are not necessarily open. I don't know what brand of kit you ordered but I would suggest that you get something ethanol compliant - Daytona Carburetor is who I use.
If you have time, visit some of my blog posts and videos...
https://www.hotrodreverend.com/post/rebuild-tips-tricks-for-the-holley-4000-carburetor
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By 55blacktie - 3 Years Ago
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Better call Sal.
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By Tedster - 3 Years Ago
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Kind of want to back up a bit first, while the carburetor inlet needle & seat is of course critical they cannot be expected to function if the fuel pump output pressure itself exceeds limits, this is a common problem today and often overlooked.
Output pressure is easily measured using an ordinary Mechanic's vacuum gauge. No special contortions or setup is required either, simply connect the gauge to the fuel pump outlet and crank over the engine. Engine doesn't need to be running.
With the fuel pump pressure verified to be within limits, carefully adjust the float height to achieve the proper fuel height in the carburetor bowl. This is a key operating point for carburetor calibration, everything is predicated on this.
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By Hoosier Hurricane - 3 Years Ago
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There is a large brass threaded plug on the back of the fuel bowl for access to the needle and seat. When the gasket on the plug leaks, fuel runs down into the secondary bores and into the intake manifold, causing very rich mixtures and lousy fuel mileage. Also there is a brass transfer fitting between the throttle body and fuel bowl. It has an O ring on each end, and if the O rings leak, again fuel runs down the secondaries. There are gaskets and O rings in the carb kit for both of these areas.
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By darrell - 3 Years Ago
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the kit will be here first of the week.this thing was flooding so bad when you returned from a drive and took the breather of and shut it down the vapors would roll out of the carb.
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By FORD DEARBORN - 3 Years Ago
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All excellent advice and ideas. One more item that could be responsible for flooding is a gas logged float. Can sometimes hear/sense fuel in them when shaking and somewhere out there should be a weight spec in grams for that float.
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By paul2748 - 3 Years Ago
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55blackties has the best idea. These are not your usual Holley carbs and have quirks that most people don't realize. In my experience and opinion, a pro that rebuilds these carbs for a living is the best way to go if you don't have experience with them.
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By 55blacktie - 3 Years Ago
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Someone on another forum recently sent his 4000 "Teapot" carburetor to Holley to be rebuilt; he was pleased with the results. I think he paid $400+. I don't know what Sal charges, but he knows what he's doing.
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By darrell - 3 Years Ago
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thanks for the advice.i rebuilt lots of 2100 and holleys over the years but these sure are different.these are good carbs when everything is in order.they were great on fuel as well.
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By 55blacktie - 3 Years Ago
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They've gotten a bad rep over the years, but mostly undeserved. Ford had no problem putting 2 of them on the 57 E-code. There is a do-it-yourself modification that will allow you to use a 57-up distributor with the 55/56 carburetor. See Ted's article on eatonbalancing.com.
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By DANIEL TINDER - 3 Years Ago
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One thing not mentioned: The rebuild kits all have neoprene/vitron needle tips. Alcohol fuel eventually makes the tip gummy/sticky. I installed a NOS brass tip and never had a problem since. Of course, THAT ‘teapot’ issue causes the opposite of the O.P.’s ‘flooding’ problem, but just thought I’d add it to the Holley 4000 discussion.
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By DryLakesRacer - 3 Years Ago
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An old time carb rebuilder I’ve used and one who rebuilds Holley 4000’s for one of the larger Thunderbird/ Ford car/Mustang parts suppliers told me 8 years ago the accelerator pump material did not work well with the ethanol blended gasoline. Has that been addressed in the recent years?
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By PF Arcand - 3 Years Ago
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Just for info; as most on here know, there are fuel stabilizers on the market that are essentialy for storing fuel for extended periods. However, one product that claims it "neutrilizes" the Ethanol in fuel, is Sta-Bil "360 Protection". Approximately 2 oz treats 10 Gallons of gas. It's not cheap, probably about $8 U.S per bottle, which treats 50 Gallons, but having to repair or replace much of the fuel system on an older vehicle isn't either..
... N.B.- My blurb above seems to have been taken out of context in follow up here... Stabil "360" isn't advertised for long term fuel storage. It's labeled as a "neutralizer" for Ethanol with a use fomulae per gallon...
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By Joe-JDC - 3 Years Ago
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Use Stabil at your own risk. Here in south TX, it turns gasoline into a gel after a few months. Ruined two of my gas tanks and the electric fuel pumps. I will not use it. Just my experiences. Joe-JDC
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By 55blacktie - 3 Years Ago
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I've used it in my 2017 Ram and my daughter's 2001 S10/w no problems. My brother also used it in his I/O with 408 Windsor stroker. I filled up my 55 Tbird's tank and added Stabil before starting restoration. It's been in there for years. I probably will drain and replace the tank/w stainless and replace what could be the original fuel line, once ready for the road. If you would like, I'll check to see if it's turned to gel.
Had I known how long the Tbird would be sitting, I would have just drained the tank and left it.
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By paul2748 - 3 Years Ago
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I can add to that. First, I have never used this products and never had a need to. The 10 % I put in my cars in October/November was just as good in April/May when i got the cars on the road again. The only thing that I did was start up the cars during the down time.
My son used Stabil - it gummed up his carb just like Joe said. My son didn't mention about the other parts, but I assume he had a problem with the other parts.
. Joe-JDC (5/22/2022)
Use Stabil at your own risk. Here in south TX, it turns gasoline into a gel after a few months. Ruined two of my gas tanks and the electric fuel pumps. I will not use it. Just my experiences. Joe-JDC
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By DANIEL TINDER - 3 Years Ago
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I quit using the original formula Stabil after a blue accelerator pump failure (though it could just as likely been the gasohol, since failures continued). I started using the marine formula instead (and CASCO’s black pump), but had springtime engine miss symptoms last year (until after a couple fill-ups). Go figure. Maybe I got the bottom of the stations tank in the late fall?
Indications again the pump has failed/needs attention (bogging). I burn 93 just to keep the alcohol minimized, but winter storage success is hit-or-miss, depending on health, the weather, etc. I got away for many winters by just driving occasionally (if the streets were dry).
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By darrell - 3 Years Ago
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put neddle and seat in flooding like crazy.smell the gas as your driving shut it down and its running in to no end.theres something im missingstick your fingers down the back barrels and its soaking wet.
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By Robs36Ford - 3 Years Ago
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Clogged air filter ?
As Daniel mentioned the two brass tubes at the back beside those barrels you put your fingers into have o-rings at the top cover and the main body. If they have hardened or crack they will leak fuel. Also check the tubes for cracks, they bend real easy.
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By Ted - 3 Years Ago
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DryLakesRacer (5/20/2022)
An old time carb rebuilder I’ve used and one who rebuilds Holley 4000’s for one of the larger Thunderbird/ Ford car/Mustang parts suppliers told me 8 years ago the accelerator pump material did not work well with the ethanol blended gasoline. Has that been addressed in the recent years?
The Daytona Parts carburetor kits for the Ford Teapot carbs are advertised as being ‘Ethanol Resistant’. I have had good results with these while using10% ethanol laced gasoline. The part number for the ’55-56 Ford/Mercury Holley model 4000 carb is #603 while the part number for the ‘53-54 Lincoln/Mercury Holley model 2140 carb (also a teapot abeit just an earlier model) is #636.
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By darrell - 3 Years Ago
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fixed.if i would have taken the carb all apart i would have seen the problem the first time.when you take the bottom of theres a tube that fits down into a hole in the bottom called a fuel inlet adapter thats at the back.it has an o ring and thet was dried up.i havent worked on one for 50 years so tried to get away with as little as possible.
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By 55blacktie - 3 Years Ago
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darrell, you can't remember an "important" detail from 50 years ago? I can't remember what I had for dinner last night.
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