I have a 4x2 setup on a fresh build 327. The carbs are rebuilt holley 94's. I can't get the engine running right. After running it a few minutes trying to set the timing I noticed that two carbs are bubbling fuel out of the nozzles on top after I shut the car off. It then leaks out all over the intake. I even pulled the top of the carbs and it was still leaking. I'm at a loss, any help would be greatly appreciated.
What are you using for a fuel pump & do you have a fuel regulator? Those only use about 2 1/2 lbs. A stock Chevy pump puts out something like 7 lbs? Try a regulator, if you don't have one. That's what I'm gonna do on my 327 with a WC4D intake & 4 carbs.
The regulator may be marked 3 lbs., but have you checked the actual fuel pressure with a known good gauge?
I use 2 lbs PSI, 12 volt pump< and checked it to be sure thats all it is. {Check showed 2 1/4 lbs} I have homemade intake w 4x2 [ 94s] Ford 292 Y V8. I have had floats sink,an had to replace them. I do not use Power valve,use a block off plug< made for doing that. AX-pump arm to max on all 4,linkage is all 4 at one time. Scoops as in pic,kind of rear= maybe a rain day,But scoops all forword sunnyday.
Contact Charlie NY, formerly on "The Ford Barn" 716-662-9159. Charlie is the : Go To " person for 94 carburetor problems.
Thanks for the info. That's a great looking setup. My buddies model a is in my garage. We just put a 55 t bird 292 in it.
This is good advice and especially blocking off the power valves. I've never been able to make one run right without doing this and one backfire can rupture a power valve diaphragm. Double check your float levels and needle and seat condition...making sure you don't have any trash in them that would allow them not to seat
These guys covered the typical issues. I'll add one thing to help diagnose any carb that tends to flood at idle. Use rubber hose to feed the carb(s). Have a pair of forceps or other way to pinch off the inlet without damage. At idle, it take only a small amount of fuel to run. Pinch it off and see what the engine does. If it runs, then stumbles and dies as it runs out of fuel, that's normal. If it smooths out, idles higher, then stumbles and dies, it's getting too much fuel. That's pressure, needle & seat, float level or internal problem as described above.
I like the sound of this diagnostic procedure. It takes a valid and logical approach. And it seems like something you might never find in a factory service manual.
As I understand your problem, the gas is bubbling out AFTER you shut the engine off. You might check this link to the troubleshooting section of my website: https://www.thecarburetorshop.com/Troubleshooting.htm#Fuelleak Jon
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