Carb not getting gas?

Hitman73 · 07-17-2005

I have a Holley 4779 (4150) 750 cfm carb it needed to be rebuilt so i bought the rebuild kit and rebuilt it. My problem is that the carb is not getting gas? i can see gas in the filter and there is gas threw the gas line. When i first put it on it seemed to get gas ran real rough black smoke and i did not have to take out the distributor so the timing is the same now nothing?. I turned up the float and still nothing i took it off and there is gas in the fuel bowls and inside the carb but is not coming out the discharge nozzles. What could be wrong?.

Fordgazm · 07-17-2005

Black smoke would be too much gas as it would be running rich . Will it idle ? If so , the best way to set the float level is to pull out the side plugs from the bowl and while it's idling you should rock the car from side to side a little and the gas should just slightly drip out when it's rocked . Did theese problems just start after you put the kit in it ? Possibly the kit came with more than one metering block gasket and you installed the wrong one blocking off a fuel circuit .

Fordgazm · 07-17-2005

Another thin I will do after a rebuild is to screw the air/fuel adjuster screws ( the little screws on the side of the metering blocs down toward the bottom ) anyhow I screw those all the way in and then open them up exactly 2 1/2 turns That usually puts it right in the ballpark . What size of an engine is it ?Are you sure that all of the vaccuum hoses are hooked up and that no vaccuum ports on the carb are open ?

Hitman73 · 07-17-2005

No it will not idle i have to keep the throttle down to even keep it going and its is real rough with alot of smoke not black anymore kinda whitesh. Before the rebuild it was acting like it was gummed up. The carb now is getting gas but like i said real rough idle like its out of timing but i did not touch the distributor.

I did that with the mixture screws 2 1/2 turns. It is a 351 cleveland all hoses hooked back up to original spots. I did replace the intake gasket also as it was garbage i noticed today that tranny fluid is leaking under the car alot of it actually. I am to the point of frustration do not know what to do?.

Fordgazm · 07-18-2005

Yeah , I hear ya . sometimes it can be a real pain in the ass . Just take your time and try not to get frustrated . Did the air fuel screw thing help at all ? Did you set the floats like I said ? Are you sure that the accelerator pump is gapped right ? If the cam is pushing on the accelerator pump even a little it will cause it to push gas in through the accelerator pump circuit . What do the spark plugs look like ? Do they smell like gas ? What all have you done since the last time it ran ok ? Sorry for all the questions , but the more info I can get the better I can steer you in the right direction .

Hitman73 · 07-18-2005

Did the air fuel thing help at all?. Yes it stopped the black smoke.

Did you set the floats. Yes

Are you sure the accelerator pump is gapped right?. I have no clue.

What do the spark plugs look like?. I will have to check them today.

What have you done since the last time it ran ok?. Pulled carb did the rebuild kit, pulled intake manifold put in new gasket. Thats it the carb was not getting gas when i parked it it is now getting gas but does not idle and runs rough with some white smoke.

Fordgazm · 07-18-2005

Look at the arrow in this pic . This is the accelerator pump arm . Where that bolt/spring combo touches the accelerator pump arm, there must be a gap there . I'm thinking . 015" but I'm not sure . It's in your manual that came with the carb kit . Either way , if there is no gap and that bolt is pushing down on the arm even a little then it will be getting the pump shot even when it shouldnt . This will cause it to idle like crap or not at all . Now you said it wasnt getting fuel when you parked it . Do you mean before the rebuild ? If so then you heve another problem . bad fuel filter/s bad fuel pump . Is it a mechanical pump your using ? Do you have a fuel pressure guage installed anywhere in the fuel system ?If so whats the pressure reading ? Are you using a fuel pressure regulator ?

Fordgazm · 07-18-2005

Do you happen to know anyone that has a carburetor you know for sure is fine thet would let you throw it on yours for a few minutes to see how it runs ? Even if you pull it off a buddies car and put it on yours just to see what happens . That will tell us if it's the carb or if it's something else . Did you figure out the transmission thing ?

Hitman73 · 07-18-2005

The accelerator pump arm actually moves alot and there really is no gap. It was not getting gas before and after the rebuild. I think there was no pressure and had to wait for the fuel to come threw the line because now it gets gas. It is a mechanical pump, no fuel pressure gauge, and no i am not using a fuel pressure regulator.

I am going to see if my buddy will let me use his holley this weekend hopefully.

I pulled the spark plugs all were black and smell like gas somewhat. one spark plug was broke under the metal arm and the arm was bent very badly?. What you say about the acc pump arm is very interesting because they move alot when i push throttle down or move the throttle lever there is alot of movement in both. Are they supposed to move that much?

Transmission i have no idea keeps leaking somewhat?.

By the way thanks for the input your help and feedback are the reason i love this site thanks Jim.

Fordgazm · 07-18-2005

Ok here is the deal . You flooded it out , thats why the plugs are like that . Toss those in the trash because they are now junk . Get some new plugs . Do me a favor and check the oil and see if the oil level rose up any and if the oil smells like gas . If so then change the oil and get a new fuel pump because the diaphram is broke . The accelerator pumps should have a lot of travel in it , but that bolt must be able to lift off of the pump lever . there should be a little gap in there . I'm out of time right now because I have to get to work . I'll check back tommorrow at around 6:30 am when I get off work . I think we may be making some progress . Oh yeah , the broke spark plug is form actually hitting a piston . you may want to put a spark plug washer on that one when you put the new one back in . Good luck and let me know what you come up with . Later .

Hitman73 · 07-19-2005

The oil level has gone up and it does smell like gas. The carb i am leaning toward a reman or new one. I love the car my first stang but dam is it frustrating the car ran like a champ when i got it several months ago now i want to sell the POS

. 1 thing after another is going wrong with it dam salesman suckered me in i love classic cars. ignition went bad fixed it, then intake bolts were flying off, then carb, now new fuel pump, battery, new intake gasket ect. keeps going on and on and on

.

Fordgazm · 07-20-2005

It could also just be a stuck float that put all the gas in the oil , I'm not there so I cant tell ya for sure . you could pull off the fuel pump and see if there is gas by the pump lever . It shouldnt have any , so if it's there then the pump is bad . Personally I would just replace it since you said it wasnt getting gas before . I would do the pump first then see how it runs . The carb may be just fine It's just not getting the right amount of fuel because of the pump . Whatever you do , replace 1 part at a time and see what happens . That way it's easier to troubleshoot

Fordgazm · 07-22-2005

Any news ?