Topic: carburetor problem

[jarrattbl]

I swapped a carbureted 302 from and 84GT into my '68 fastback.  I did not have the original carb so I installed an Edelbrock carb with electric choke.  I also changed the fuel pump to one for a '68 without a return line.  I have a terrible flooding condition that I have been unable to solve. I have tried another carb and another fuel pump and the problem still exists.  Any ideas??

[Soaring]

I swapped a carbureted 302 from and 84GT into my '68 fastback.  I did not have the original carb so I installed an Edelbrock carb with electric choke.  I also changed the fuel pump to one for a '68 without a return line.  I have a terrible flooding condition that I have been unable to solve. I have tried another carb and another fuel pump and the problem still exists.  Any ideas??

First of all, what venturi size isthat Edelbrock or the last one you put on the 302?  What size jets are in them?  The pump is most likely not your problem.  You just have too much carburetor for the engine.  If you can research and find smaller jets to put in the Edelbrock, then do that.  The pump will not flood the carb with the right sized jets.  If you can't change the jets, then get a Motorcraft 2100 carb if it is a 2V intake, or a Motorcraft 4100 if it is a 4V intake.  Put that Edelbrock up for sale on Ebay.  That is about the crappiest carburetor you can get to put on a stock Mustang engine in the first place. 

[jarrattbl]

Hey, thanks for the reply.  I originally tried a Carter AFB 625 on the 302 and it started, idled, and ran fine for about 5 min.  The flooding problem started so I swapped the Edelbrock carb off of my other ride to see what happened.  The Edelbrock is 750 which I realize is too much.  It started, idled, and ran fine for a few minutes and then the flooding condition started again.  I am wondering if its really the carburetor.  Thanks for the reply.

[rmodel65]

whats you fuel p.s.i.?? you might need to add a regulator

[Soaring]

650 and certainly 750 cfm are way too much carburetor for that 302.  The 480 motorcraft would be more like it.  I suppose you know that you can adjust the float in any carburetor to accept more or less fuel being dumped into it by the pump? 

[jarrattbl]

I installed a fuel pressure gauge and its holding 7.5 psi.  I think it should run with this amount of pressure but may add a regulator to get it slightly lower.  I also adjusted the floats in the carb to factory specs.  Still not running.  Any ideas??

[Soaring]

You should have 39-40 psi of fuel pressure at idle.  And, if you have an electric pump, you will need a regulator.  And, unless you have some pretty serious mods on that engine, those carburetors are simply too big.  Too much venturi.  Too much fuel.  The jets are just too big. 

[rmodel65]

he isnt EFI glen

[Soaring]

I know that, but he has yet to say if he has a 2V or a 4V intake. 

[jarrattbl]

its a stock engine out of an 84 mustang gt - 5.0 H.O.   Going to try a smaller carb though I think its more to the problem than that.  I have run 625's on 302's before without any problems.  Also this engine ran good for about 5 min. when this carb and the one before were installed.  It just doesn't quite make sense to me since it did start and was drivable with each carb for 5-10 minutes. Now it is blowing gas out of the carburetor.

[Soaring]

It doesn't make sense that you can run for 5-10 minutes just fine, then start blowing gas out of the carb.  For some reason, your float is not holding and after the 5 or so minutes, it is just turning loose and allowing as much gas as your pump can produce.  A question..... when you overhauled that carburetor, did you make sure the float spring was fully attached at the rear of the float?  It hooks into a groove at the rear of the float.  If not properly attached, it will allow too much fuel to enter the bowl of the carburetor. 

[Bossnutt]

650 and certainly 750 cfm are way too much carburetor for that 302. 

I had a 650 on my 302 and it worked just fine.

[Soaring]

650 and certainly 750 cfm are way too much carburetor for that 302.

I had a 650 on my 302 and it worked just fine.

Really?  And what mods did you have on your 302?  If a 650 cfm carburetor was meant for a stock 302, Ford would have put one on them at the factory. 

[rmodel65]

it will work fine but low end and mid range power will be hurt by it, a smaller carb will make the motor a lot more responsive.