Edelbrock stalling then flooding.

[threeonthetree]

Having a issue with Edelbrock carb. It runs good but it’s rich! If I let it run on idle it stalls out then floods bad. Fuel pressure is at 6 pounds.
I’ve set the floats at 7/16. Blown out the ideal circuits. The fuel mixture screw does nothing when adjusted also and my idle adjustment screw is backed out all the way.
Im not sure what the issue is I ordered a fuel regulator to try and bring fuel pressure down to 4.5. I’ve also ordered a 1/2 phenolic carb spacer but I don’t think that it is heat sink, because in this video the carb spacer is not hot to the touch.

Also have a video link of what it is doing. Any advice is helpful. Motor is a .06 over 283, I am running pcv on the old road draft system and it is working.

https://youtu.be/Snys2o8c4g8


https://youtu.be/frV850vG7VY

[rockyrivermark]

Give a little history in it.
How long have u owned truck?
Did it ever run good or always rich?
Is the carb new? Recently rebuilt? How old it is?
I have an edelbrock 600 and read they don't like fuel pressure
Over 5 lbs.
Thay video is beyond a rich/lean adjustment, gas really dumping in there.
Reduce fuel pressure is the first thing I'd do.
Post results.
Mark

[randy500]

The rubber tip of the seat needle is missing damaged or being held open by debris.
Remove the top of the carb, remove both seats and the strainer below the seats, blow it all out.

[threeonthetree]

Originally Posted by rockyrivermark

Give a little history in it.
How long have u owned truck?
Did it ever run good or always rich?
Is the carb new? Recently rebuilt? How old it is?
I have an edelbrock 600 and read they don't like fuel pressure
Over 5 lbs.
Thay video is beyond a rich/lean adjustment, gas really dumping in there.
Reduce fuel pressure is the first thing I'd do.
Post results.
Mark

Had the truck since 2009. Had a six originally.
The motor is a 283 .060 over that I picked up it has less then 2,000 miles on full rebuild I got all the paper work with it of everything done. Guy had it in a pickup and wanted more power so he pulled it. Motor runs good otherwise.

The carb is new 600 cfm 1406 it was used one season on a ice drag car but it’s is new to me. And all the internals look very nice and it’s very clean inside.
I am gonna try a regulator on it and drop pressure down to 4.5 pounds.
I got a holly regulator and it should be here tomorrow.

Originally Posted by randy500

The rubber tip of the seat needle is missing damaged or being held open by debris.
Remove the top of the carb, remove both seats and the strainer below the seats, blow it all out.

The rubber is there, in like new condition on both sides. I have had it apart to check float height I blew everything out with carb cleaner.

[ZEKE68]

Edelbrock's own 110 gph mechanical fuel pumps are advertised as putting out 6 psi. and they say that a fuel pressure regulator is not required in most cases. That sounds to me that they think that their carbs will run at 6 psi. Edelbrock carb manual says don't run more than 6.5 psi pressure. Every situation is different though. The regulator may fix it.

['68OrangeSunshine]

[QUOTE=threeonthetree;8219214]Had the truck since 2009

The carb is new 600 cfm 1406 it was used one season on a ice drag car
QUOTE]
You might check on the primary and secondary jets.
Dragsters live on another planet, as far as jet sizes go. Get the Edelbrock Carb manual, [if you don't have one] and check what size jets come stock from the factory in the 1406. I have the EDL 1404 [500 CFM] in my '68 C/10 w/292 L6, and a Carter AFB 9635 [~=EDL 1405, 600 CFM w/ manual choke] on a 350 V8 in my '71 Jimmy.
Both are easy to tune.

[randy500]

The problem with blowing out an edelbrock is the screen behind the seat, if you don't remove it there can be debris in there that just keeps making its way to the seat, then it floods.

Waste all the time you want with the regulator, you can work on that all month and it wont fix the flooding problem coming from the leaking needle and seat. Its not flooding from fuel pressure blowing open the needle.

[threeonthetree]

Originally Posted by randy500

The problem with blowing out an edelbrock is the screen behind the seat, if you don't remove it there can be debris in there that just keeps making its way to the seat, then it floods.

Waste all the time you want with the regulator, you can work on that all month and it wont fix the flooding problem coming from the leaking needle and seat. Its not flooding from fuel pressure blowing open the needle.

Alright I will pull it apart in the morning and take a look.

[randy500]

I have an edelbrock on one of my trucks, it was sitting a long time before I got it, started right up and ran good, then flooded, I blew it out, etc. a couple times and it ran fine each time, Then it would flood again. I didn't remove the seats, then read on here there is the screen behind the seat, took the top off, removed the seats and screens, cleaned and blew it all out, no more flooding.

My assumption was the seat didn't need to be removed because the air would blow through nicely...most carbs have a filter or screen at the inlet not at the seat, debris can be stuck there and will not blow out.

[randy500]

I'll add one more thing....

The idle screw could be opening the primary butterfly's too far allowing a vacuum to be created across the venturi, which causes it to drip....the idle screw should only be set 1/2 to 3/4 of a turn in. If its further than that a vacuum is created across the venturi at idle which will cause fuel to drip. The uncontrolled delivery of fuel will cause erratic idle, flooding and stalling.
Bent linkage can hold the primary and or secondary butterfly's open. Check the linkage and make sure the secondary is not dripping fuel. (I couldn't tell if it was in the video)

Often the primary idle screw is too far in because the timing is not advanced enough, sometimes the timing is off from mismatched timing tabs and balancers, there are basically 2 sets of tabs and balancer markings, a mismatched set can cause retarded timing which is incorrectly compensated for with the idle screw.

[Barnfind46]

I had a similar issue with my 327. Edelbrock carb got debris and would not idle and flooded out. If it continues to happen you may need to clean your tank. A lot of debris can get passed the filter.I got passed that and now I am dealing with the winter blend fuel wanting to vapor lock when the temp gets into the 80's. Old trucks are fun! Old trucks are fun!

[Myoldtruck]

im running the same carb on my stock 350. I also had same issues in the start with this carb.
Added a pressure regulator set to 5.5lbs, this is a must from every thing i researched.
confirmed my vacume advance was working, I have mine connected to intake vacume port.
I fixed my intake bolt vacume leaks, this prevented me from making mixture adjustments at idle, your going to need a vacume gauge connected to see what the engine is doing at idle.
I rejetted carb to factory manual choke specs, which is a little richer.

My truck runs really good now. At first I wanted to throw this carb in the trash.

[68Stepbed]

It's an Edelbrock. Every one I've had does stupid stuff like that. Also, if it's a 600, it's too much for that 283.

No one ever takes my advice, but a Holley 500cfm 2 barrel would work like a champ on that engine.

[69SCSS]

FWIW, been running Edelbrocks forever on street driven small blocks, and I have always run a regulator at 5-5.5lbs. When I had it set at 6-6.5 it floods out, overcomes the needle and seat.
And yea, a 1405 is a bit large, but with the weights on the secondaries it won't let it open them totally. Still, it may bog if you floor it, but the primaries aren't too large.

I second on the Holley 500, that's a great simple carb. But MPG will suffer because of the huge butterflies. Great for a small block performance application though.

[threeonthetree]

The regulator fixed all the problems thanks for the help.

[rockyrivermark]

Originally Posted by threeonthetree

The regulator fixed all the problems thanks for the help.

Wonderful. Glad we could help ya.
I've read those edelbrock are finicky about fuel pressure.
I have a standard pump and love mine. Runs good.

Mark

[Bearhawg]

I apologize for resurrecting an old thread. Would someone be willing to share a picture of where/how they mounted their regulator? Best would be someone with a stock looking engine compartment. The regulators I've seen are pretty heavy and have to be mounted to a solid surface rather than placed "in-line" on the existing fuel line. Just looking for the best way to reduce the pressure to my overly-sensitive Edelbrock 1406

Thanks!

[HO455]

Here is how mine is installed. PO did it with hose and I cleaned it up with tubing. I have an electric fuel pump. The filter next to the carb is 30 or 40 microns. It is a nonreturn system. The photos are showing the generic Holley regulator that came with the truck until it failed and its replacement. Not the tidiest set up, but I have found that regulators mounted on the engine have a shorter life span. Plus they get hotter and heat the fuel as a result.

[Bearhawg]

Thanks for the picture!! Very helpful. Anyone else?