So my 74 F100 with 360 automatic and electronic ignition, all basic stock.
I had a problem with the float stuck and ended up replacing the carb with a rebuilt new one. stock carb. Started the truck and it ran great, choke worked good, would fire right off and idle with no issues.


Then, I decided since the EGR was unhooked and the previous owner had already removed the vac lines going to it, I would remove the EGR valve and replace it with a machined plate. Took off the carb, had to buy a new manifold to spacer gasket, and put a new EGR block off plate with new gasket on it, making the plate and such, the carb was off the truck about a week and was turned upside down a few times, just looking it over, but never dropped or anything.


Today, I put it all back together and I cant get the truck to start now, it spins over fine, acts like it wants to start but will not, I tried starter fluid to prime the carb, it coughed a few times and backfired through the carb. I took a plug wire off and using the wire not the plug, checked for spark and it had a good arch. Then I took off the line going to the carb and cranked it. It pumped out gas fine. So then, thinking maybe I had it flooded, I took off the carb and turned It upside down to get all the gas out of it and put it all back together. Still no start. I made sure the vac lines were all in place. The choke was hooked up as it should be.


The carb is less than 30 days old and has only run about 30 minutes on the truck. Could it be something in the carb? Nothing was touched as far as timing, and since I have spark, and fuel going to the carb, I'm thinking maybe I got a bad carb? Agree or disagree or thoughts guys. It was running fine before I remove the carb to omit the EGR valve off the spacer plate. That and the new gaskets are the only changes. Since the valve wasn't connected, blocking it off should have not effect. BTW, all surfaces were cleaned and scrapped when you gaskets were installed.
Thanks,

 

What kind of carburetor

Check the timing

Did you get junk in the lines

Bad fuel

Is it possible the egr had a vacuum leak and now the idle isn't high enough

Is it possible it has a leak now

 

It's s stock 2bl from motor craft.
No timing change.
Gas was fresh and was running fine before taking off carb.
Idle was good before and until it starts, I can't check that.
When cranking, it sounds like it's flooded. I opened the choke up all the way and held the throttle open and it still just cranks. Very weird

 

Pull a spark plug or two to see if they are fuel soaked. If it's flooded badly, you may have fuel in the oil pan.

 

sounds like everything is fine, when you go to start instead using starting fluid I would use gas pour it down the choke start it. you might have to do this a few times until it catches and runs. don't pour too much in it or you would cause it to back fire. I would get something the size of a 20oz bottle and pour a little less than half the bottle. in order to get it to run you will need to get the float bowls filled up.

 

plugs were dry

 

K.I.S.S. Look down the carb while operating the throttle. See if it is squirting fuel. If not and the fuel pump is pumping you may have a stuck float/needle and seat. You really shouldn't turn a carb upside down. Thats what I have heard for beaucoup years.Dont know whether its true or not. I do know there are lil b.b. sized check valves that regulate the fuel in circuits. Can they come out when turned upside down? I dont know. Can they stick? Probably.

 

Yeah I was told in HS Auto Mechanics class in the 70s never to turn a carb upside down. I still live by that rule.

 

Old farmer trick.......If something is stuck in the carb, give it a few light taps with a large screw driver handle, small hammer, crescent wrench.......what ever you have in your pocket. Don't get carried away and hit it too hard. A lot of times the needle valve hangs up in the seat and the tapping will jar it enough to free it up.

 

Yeah, handle of a screwdriver is how I was taught.

 

where do you hit it exactly? I'll try that.

 

Where the fuel line goes into the carb. If turning it upside down messed anything up, it made the needle stick, and that is where it lives.

Have you looked down into the carb and then operated the throttle by hand to see if any gas squirts out of the accelerator pump nozzles?

 

Tap around on the float bowl........In the area where the needle and seat are.

 

Sounds like a possible stuck float, does it squirt fuel down the throat like the guys stated above?

Lots of little springs, small parts, and tolerances can go wacky when you turn em upside

 

Instruction unclear, tried a BFH


and then JB Weld