Hey guys, back again with another issue, this time it's the carb. I have a 272 with the Holley-built 2 barrel. My old carb was leaking from where the throttle linkage went into the carburetor(or so it appeared), so instead of messing around with a rebuild kit, I found another one on Ebay(rebuilt). It bolted right on and started right up, but today when I went to start it again, I noticed it leaking in what appeared to be the exact same place! I though to myself " you've got to be kidding". I know there are some idle fuel mixture screws on the back and after adjusting these(they were all the way out) and adusting the idle screw it seemed to stop(for now). Could it be it is getting too much fuel and over running the float? I have the stock  mechanical fuel pump, but I did install an aftermarket glass inline fuel filter. Seems to me this wouldn't affect anything though. Any help would be appreciated, I'm tired of tinkering and want to start driving!

F-Fun2;

I also had a '56 F-100 with the stock 2bbl. holley. Never could get the original carb to perform right. Bought a new, 500 CFM 2 bbl Holley from Summit racing http://www.summitracing.com/parts/HLY-0-4412S/ and never had any more problems. That new carb made a huge difference in performance, although Iam not a big fan of the holley power valves. Could be that the "rebuilt"carb you bought on Ebay was having the same issues for it's owner as you had.

Just my 2 cents worth

Rono

  Ron Lane,  Meridian, ID

Before you give up on this one you might want to check the float level first.The add ons you made should not affect the carb.Did you replace the fuel pump?Sometimes excessive fuel pump pressure will overwhelm the needle and seat.I dont know if the Holley 2 bbls are like the Holley 4bbl but the 4bbl dont like too much pressure.5-6 pounds is good.If you turn the mixture screws in slowly at idle does the motor quit?It should if its working right.

  

Thanks, do you think it could be a power valve problem?

Will the Holley 2300 bolt right on or do I need an adapter as I have the 3 bolt manifold configuration.

To test for power valve leeking turn the idle mix screws in.If it keeps running you may have a power valve proble.Should quit when screws are turned in.

  

f-fun2,

I'd check the float level. If the mixture screws were'nt near spec who knows what else was checked. Float level should be checked and adjusted each time needle and seat are replaced.

A good way to check float levels is with a drill bit of the required dia. Float hieght is measured between the float and carb body. Sorry I can't remember the spec.

Using the later two barrel carb with four bolts best use a later 57 and up manifold they are cheap ($20) and relatively easy to get. Then you can use a 350-500 holley. You will have to do some linkage modifications and use a later dizzy.

Grizzly (Aussie Mainline)

I think the first thing I will do is replace the fuel pump. This truck sat for a long time and from what I've read, fuel pumps can actually pump too much or too little fuel when the start to go bad. I need to mention that it also died on me when doing a test drive. After coasting to a stop I saw no fuel in clear filter at all, however, it did start back up after closing choke all the way, and I was able to limp it back home. When I started it later, I noticed the leaking problem. I know the fuel pump has to be worn(like everything else!).

There is a clue right there.If the truck has sat for a long time there is probably a lot of crud in the fuel tank and line.Is the fuel fresh?Probably what is happening is the needle and seat are getting stuck open and flooding the carb.You need to go through the tank and lines and clean it out.Putting a new pump on is a good idea also.

  

f-fun2  Where are you located?  If you would like to go with the later style manifold (and dizzy) I'd be happy to give you one, the manifold that is.  Got a stack of them, just pay the shipping.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias