Ok so im new to carburators and having issues finding anyone who can help. I have an edelbrock 1404 500cfm new and stock componets. Im running rich I can smell some feul and my plugs have quite a bit of black. Its on a 300six with a offy intake, headers, 268h comp cam I belive .456 lift, forged rod, and crank, and 30 over forged pistons. Any advice is greatly appreciated, thanks.

 

Check your float levels. If the float is set too high it will be dumping too much gas.

 

You might need a fuel pressure regulator.
Edelbrock recommends no more than 6.5 psi.

 

Might be as simple as needing the choke adjusted.

 

All of the above. But tell us more about the conditions in which it is running rich. Idle? Cruise? Acceleration? I ask because those are 3 different systems within the carb.

And, what fuel pump are you running?

 

Which manifold do you have Matt?
It is getting colder here.
I don't know where you are, but you might need some heat in the intake.

 

How rough is the idle with that camshaft? If it's really rough and loping, the power circuit in the carb can be turning on at idle, giving you a rich mixture.

 

Sorry about the delay guys just got out of work.
1 float level im assuming is correctly its brand new and its not flooding like the needle and seat isnt sealing.
2I dont think its feul pressure its a mechanical pump oem from advance
3 needle and choke? I assume your talkung about metering rods and choke, but choke is fully open once warmed and needle again im not sure if your refering too needle and seat but I figure its sealung because its a new carb.
4 as far as when its running rich im not sure I dont have access to a wide band meter to assess when it has rich or lean conditions. Any suggestions on how to determine when my rich conditions are occurring are greatly appreciated though. And again oem mechanical feul pump
5offy dual plane and not here really im in florida
60s and not too noticeable of a lope you can barley hear it which kind of suprised me.

 

If it's idling rich, you can smell it. The exhaust burns your eyes and stinks like a old lawnmower.

Where have you set the timing at? I guess you know, you are out there now by yourself, and none of the factory specs are going to be exactly right anymore, including the timing setting. You might want to take a light and see where it is now, and then just turn it a little bit till the engine speeds up, lock it down and try it. There will be some experimentation involved with a non-stock setup like this.

P.S. I went back and re-read your 1st post and if you are smelling raw unburned fuel, then that's probably coming from the carb and a little bit of that can be normal. The original setup captured all the gas fumes from the tank and the carb, and stored them in the charcoal canister till you run the engine the next time, and then the engine sucked them out and burned them. I am going to assume you do not have any of the emissions lines hooked up, so you have a vent line from the gas tank running under the hood, and your carb is now also venting under the hood.

 

Matt - If the problem continues don't assume the carb is perfect from the factory. Pull the top and look for debris. Wipe the needles down. Check/set the float level. Make sure there are springs under the rods.

As for the fuel pressure, just because you have a mechanical pump doesn't mean the pressure isn't too high. If you haven't checked the pressure then you do not know.

Regarding running rich, you said you can smell fuel and the plugs are black. Are you smelling the fuel when it is parked? As Dave said, that is to be expected. Does it idle well and does the vacuum show about 20" at idle? When you drive around town does it have crisp response or is it sluggish? Ditto on the highway. How does it acclerate at full throttle? And, have you tried new plugs to see if they turn black?

 

Just because the carb is new in no way means it is even close to correct. I have seen more than one of these Edelbrock carbs that were not right from the factory. I have known a few guys that finally give up on them and go back to a Holley. My opinion on the Edelbrock carbs is they are pretty, and when they work they are good but they are not the most reliable.

 

I disagree totally and completely. When they work they blow a Holley away on reliability. Never had a blown power valve or accelerator pump on an Eddy and never will. Had lots of them on Holleys and Autolite/Motorcrafts.

But, I agree fully that just because a carb is new that it shouldn't be suspect when you have a problem.

 

Franklin yes idling it is a little rick I can see a puff of white smoke everyonceinawhile and can smell feul vapor. Emissions are totally removed I live in florida so I dont have to keep them but the vaopor canister.and feul lines were removed and plugged at the tanks while the body was off. Eddy yes I totally agree new stuff can be broke I just assumed these issues seemed more like incorect metering rods than too much feul pressuer or a flloding carb. And the plugs in are new

 

There are different fuel circuits in the carb, idle, off-idle and main and the accelerator pump. They are all adjusted differently.

If your problem is at idle, then that's the idle circuit and it has nothing to do with the main jets and metering rods. The idle circuit is adjusted by the small screws down low on the front of the carb. If you can't seem to get any affect from them, make sure your idle speed is lower. If your idle speed is too high because the throttle is open too much at idle, then the off-idle circuit can be kicking in affecting your idle adjustment screws.

If it's still rich at idle, and it seems to go rich and then not rich in a rhythm, your float may just a little bit high. When the fuel level is a little bit high, fuel can spill over into the engine and make it run rich. Even though the carb float level is set at the factory, different fuel pressures will raise or lower the setting. So it should be double checked on your application. Read the instruction book, but I believe I am right in saying you will have to run the truck, then stop it and take the top of the carb off to check the fuel level in this carb.

 

Do you hear fuel vapor pressure when you remove the gas cap? Seems like that plugged line was where vapor pressure was allowed to go to be burned by the engine.