carb flooding?

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wilcom

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I bought that new Holly 4 bl carb that has the crossover v ent tube from the front 2 barrels to the rear so you dont flood out when climbing. I just tried it and it didnt seem to work properly. I was climbing a steep grade slowly in 4 low and it started choking out.....i had to keep pumping the gas peddel quite a bit with the clutch in just to keep the engine running and I had to keep it up over 2500 rpm. when i left off the gas peddel it would die so I would pump the peddel like mad to keep the rpm's up.

Any ideas?

 

68rrflyer

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I bought that new Holly 4 bl carb that has the crossover v ent tube from the front 2 barrels to the rear so you dont flood out when climbing. I just tried it and it didnt seem to work properly. I was climbing a steep grade slowly in 4 low and it started choking out.....i had to keep pumping the gas peddel quite a bit with the clutch in just to keep the engine running and I had to keep it up over 2500 rpm. when i left off the gas peddel it would die so I would pump the peddel like mad to keep the rpm's up.
Any ideas?
I'd defenitely check those float levels to make sure you're not starving the engine that way. Have you checked them yet? Since it's a new Holley, they have the sight ports on the side and the fuel should be at the lower edge of the port. Even on new carbs it's a good idea to check the float levels as I've found most are not adjusted correctly from the factory based on fuel pressure, etc. What's the model number on the carb? That tube that interconnects the bowls is only for fuel distribution between the bowls during filling, not the climbing-stalling prevention. There's a different meetering block inside the carb that does that for the 4x4 carbs. Hope that helps! :D /emoticons/[email protected] 2x" width="20" height="20" />

 

BroncoJoe19

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IS this a common problem with carbed engines?

Could it be that you were actually low on fuel and the pick up tube inside the tank was sucking air on the steep incline?

Do the EBs have a fuel reservoir to protect against this?

 

Seabronc

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Ditto Broncojoe19. Carbs are never going to be completely satisfactory for steep grades. What carb did you put on it? Was it one designed for off road? Some have baffels to prevent starvation, also long vent tubes in an attempt to prevent flooding. An EFI is the best thing for most any angle except inverted :D /emoticons/[email protected] 2x" width="20" height="20" /> .

Good luck,

:)>-

 
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wilcom

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Yes the carb is the one from Holley that is for 4wd and has the venting and baffles and is supposed to be great on the steep climbs. Called the Avenger. It only has 100 miles or so on it and I didnt check the float alignment when I put it on since I assumed it was factory set per the data test sheet included in the box.

The gas tank was full and I was not bouncing a lot but more going slow in 4 low and bouncing a bit. After I about half way up the hill (25 yds) I stopped on the hill to pump the gas peddle to keep the engine running. I had to keep it a about 1,000rpms or more to keep it running until I backed it down on level ground....then it ran fine after ideling at 1, 000 for a bit.

Now that I have her in the garage to work on her over the winter I will check the level out and call Holley tech support for some other possible solutions.

 

Broncoholics

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I've tried it all and nothing worked but fuel injection. I went with the Holley Pro Jection system which uses the stock intake after taking off the carb. Its just like adding another carb with a bit of electrical and a computer. Its basic and runs at all angles. Look into it!

 

Bully Bob

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W/O "TAD's"

You shouldn't have enough traction to climb really steep angles that would stall a good carb.

Backing down some 60 ft. (on a steep hill) is not for the faint of heart..! :eek: /emoticons/[email protected] 2x" width="20" height="20" />

This sounds like a typical flooding scenario...... Look at float levels.

Some aft. mkt. carbs req. a inline fuel press. regulator.

I would think you would want to solve & test this prob. B/4 putting it up for the winter...as opposed to looking forward to it again next spring.

 
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wilcom

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I was thinking about the fuel pressure now that you mention it. I put a new stock fuel pump on it from one of the bronco stores on the web but cant remember who. It is chrome an i assume has the correct pressure. I will measure it when i get to that point while working on her over the winter in the garage. I wonder if it is a good idea just to put an in-line pressure regulator in the fuel line any way just in case.

I was thinking of putting an electric pump in as well just to make sure the fuel supply was a steady 4 lbs.

 

Bully Bob

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Somebody on here should know the fuel press. parameters for that carb.

(or check your paperwork)

Your new stock pump, as I recall, puts out 4-6 psi & should be fine...in that, it's not hi-pressure.

Elect. pumps have their places., but can serve as a fire danger.

 
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wilcom

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yes I am sure the mechanical pump I have is the correct one and puts out the required 4lbs and I will check it out when I get her in the garage for the winter to work on. You comment about the electric pump was interesting. I dont know if i really want to put something like that in and risk the electrical going out and the safety issues like you mentioned. I thought it may have been a pressure issue since I was up at about 5,000 ft and the mechanical wasnt keeping up the pressure for whatever reason. I will also check the float levels and call the Holley tech support for their idea on the flooding issue.

Thanks again everyone for your help.

 

Broncoholics

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There is no way around the flooding problem. I've seen some off-road carbs to OK at angles but they eventually fail at extreme off camber situations.

I tried the Q-Jet which worked great becasue the float is in the center vs. on both sides of the carb. When leaning hard with standard carb, the gas fills one side completely and leave the other side almost dry. So you are in a flood/lean state and it will not want to run correctly.

With the Q-jet being in the middle you get better performance but it still is a quadrapuke so it won't last long before a rebuild is in order.

Check the wrecking yards to craigslist and e-bay. you can get EFI cheap if you keep your eyes pealed.

 

wayprow09

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Which tranny do you have?

Could be the primary jet, although that jet should cover most driving and engine rpms. Teh secondary should only kick in when your stomp on it or get to higher rpms. Ever change the fuel filter?

Its been almost 2 decades since I worked on a carb.

What does your cap and rotor look like. Could be as simple as a cracked cap, or corrosion on the contacts. Check the points if it still has them too.

 

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