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In this Discussion
- Oldcar_Mechanic May 2010
- wizade May 2010
Carb Overflow - Carb / Classic Ford Guru's Assistance Needed
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I inherited a 1954 Ford Customline with an I-6 engine last year .. the car is almost completely original and has about 31,000 original miles.
Initially, it would drive and run great for a while, but then stall out after a period of drive time ... it felt like the engine was starved for gas. A mechanic friend of mine took off the little rubber fuel line that feeds into the mechanical fuel pump and found that it would barely pass any fuel at all.... Got a new one and put it in. Seemed to help a bit, but the Carb still didn't seem to be working very well, stalling out a lot ... the mechanic said I really needed a new carb.
I did some research and found that you can't really buy new carb's for these cars and that you have to get yours rebuilt, or buy another rebuilt carb. I went ahead and sent mine in to Mac's Antique auto parts to have it rebuilt. While it was out, I also replaced the steel fuel line that goes from the fuel pump to the carb.
Carb came back looking great... Installed it ... big problem though - the carb bowl completely fills and overflows all over the place every few minutes... I looked around and figured out how to adjust the float and did that ... I was able to get the car to run for a while sometimes with the float adjusted so that even the slightest movement upward cut off the incoming fuel... but it still overflowed quite often (and stalled the car. making a mess)
I decided that maybe I just needed to get another carb - I went online and found a really nice 1904 Holley Carb ... ordered it, installed it, and within 2 minutes of starting the car, overflow again!!!! Gas is coming out the top of the carb (round thing) and all over the place by the bowl gasket. I opened this one up and adjusted the float so that only slight movement upward would cut off the fuel, but that didn't seem to do anything ... 1 minute of running and it overflowed onto the floor again. This carb looks absolutely brand new .... I mean really nice.
So ... I'm a bit frustrated.
It seems like maybe there is way too much fuel pressure coming into the 1904 carb , and that its pushing fuel in even when it shouldn't be .... that seems to make sense, but I guess I don't understand how this carb ever would have worked new then?? Surely they didn't all run this poorly when new
Where should I go from here?
- Get a third carb? (ugh)
- Get another type of carb? (are there better carburetors that I should try rather than use a holley 1904?)
- Replace fuel pump or install some sort of fuel pressure regulator?
Thanks!!! any suggestions would be greatly appreciated !
carb_126747226853649.jpg799 x 599 - 65K -
Sorry to hear you are having problems.
First thing I would do is T in a pressure gauge to see if that is the problem. If it is to high a pressure then try the regulator. The pump may have been replaced sometime in it's life and it might be the wrong one but as long as it's working, I wouldn't worry about it.
If the float is set correctly, you should not have to alter it so I would put it back to spec. Another possibility to the float not shutting off the fuel flow could be a piece of dirt (even something that you can not see) not allowing the float to close entirely. It would be strange though that two different carbs have the same problem.
Have you contacted Mac's? They are super people and may have some good advice for you.
Something else I would do is make sure you have a good in-line filter just ahead of the carb. You may be picking up some debris.
Ron -
For those searching - I fixed this problem!!

I took the fuel bowl off, held the float up gently, and had someone crank the engine... the pin cut off the fuel flow nicely, but the inlet to the carb (where the fuel line enters) was letting fuel in quickly!
I took the fuel line, entrance bolt, and metal washers out, inspected them, and then installed them tightly this time ...
No leaks ..... driven the car 20 miles or so without any issue!!! -
Well done. Glad you got it fixed.
Ron