67 Holley 2300 Problem
Yesterday,I planned a short drive to exersize the car--- had not been run in about 4 weeks. No issues on last outing. As usual, I injected a few ounces of 100LL down the vent tube as has been suggested here . Fuel in the tank is probably 60% LL and 40% No-ethanol. Car started and immediately quit several times before finally starting and seemed to idle OK . I started out and engine quit after about 1/4 mile. It would not immediately start; but, did after sitting a couple min.. Got back home and it quit a couple more times idling in driveway. It's idled OK today without quitting. There's no external leaks and all fittings seem tight. HOWEVER, I do notice that engine-off looking down center carb while exersizing the throttle linkage there's very little gas from the pump discharge nozzels. In fact, you have to look close to see any . I'm assuming you should see two good streams of fuel ? Is this likely just an accelerator pump circuit issue? What other issues could be at play? Boy, I hate to pull that center carb! THANKS
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Re: 67 Holley 2300 Problem
Is the weak accel pump noticed right after shutting engine off or after car sits for a while? My initial guess leans toward a float issue. -
Re: 67 Holley 2300 Problem
First take fuel pump pressure should have about 6 psi. if that good I recommend a carburetor overhaul or you may have a sticky check valve in the discharge nozzel that is stuck in the bore passage going to the discharge nozzel , i think more the Check valve is stuck in the bore, To check the check valve remove screw that hold down the nozzle there should be 2 thin gaskets top and bottom, it a tight fit with the choke plate , remove nozzle put you finger on the bore then press accelerator it will un jam the check valve and make sure the check valve doesn't pop out and fall down the Carb. stuff some rags down the Carb. bore , and see if that works .Comment
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Re: 67 Holley 2300 Problem
Thanks, Danny & Mark.....
I'll be working on this today...I suppose this is what happens when we don't drive them often!Comment
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Re: 67 Holley 2300 Problem
Hi Ralph, that little check valve sometime get gum up over time and get stuck, try spray air intake cleaner down that bore after, lets us know what happens ,Comment
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Re: 67 Holley 2300 Problem
Thin gasket under the nozzel and one under the hold down screw you took off to remove the nozzel look closely it shape like in cave shape under head of screw very thin gasketthumbnail-1.jpg look at Item # 10Comment
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Re: 67 Holley 2300 Problem
I need to continue this thread as my problem has continued after spending a lot of time & effort rebuilding all 3 carbs again ! Prior to initial start I adjusted idle mixture 11/2 turns out as normal ; Floats set a little low ; and primed 100 LL thru vent tube . Engine started and ran not more than 30 seconds, then shut-off . I tried several restarts with shut-off after only a few seconds. NEXT, removed bowl sight screws & found fuel pouring out all 3 carbs. I adjusted the fuel valves clockwise about as far as they would go( only a couple threads showing). All 3 valves are new .110 vitron needles.Comment
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Re: 67 Holley 2300 Problem
... Didn't mean to send without following info...Since all 3 carbs are affected, I don't suspect a hung float .So, assuming I didn't screw-up exactly the same on all 3 , It seems logical that "something" is overcoming the fuel valve & filling the bowls regardless of the float setting....at least that's my thinking right now. FUEL PUMP...? Can a fuel pump failing result in EXCESS fuel pressure? This pump has been in place 20 years or more but with very low miles. There's no evidence of any internal leaks or gasket problems . Sure like to get some additional feedback as I have too much recent experience wrenching on these damned carbs! THANKSComment
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Re: 67 Holley 2300 Problem
Ralph,
Did you check the pump pressure at idle speed, I don't think the pump would fail and create excess pressure.
Where did you purchase the .110 needle and seat and what is the stock Holley size for the application, I would go back and install stock sized parts.
Could the floats be hanging up on the inside rubbing on something. Is there a little tang on the float top the contacts the needle and could it be bent down resulting in to little threads showing after lowering the float. I encountered that on a Holley 2818 and simply bent the tang up which allowed the float level to be lowered and still have 1/4" threads outside the bowl.
I feel you pain, try to figure out if the motor quits because of excess fuel or no fuel. You first post mentioned no fuel from the pump shot so you may have two problems to deal with. Get away from it for a few days and you will go back with a better attitude.Comment
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Re: 67 Holley 2300 Problem
Tim, the .110 needle is I believe recommended by Holley for this Tri-power setup. It's hard to believe all 3 floats would suddenly be hanging up & the front carb bowl I've removed so far shows no indication of that problem. The lack of a pump shot after shutdown is no longer ... I now get a decent shot when moving the throttle right after engine quits. I focus on the fuel pump just because the overflow is happening on all 3 carbs! I'm sure there's a relatively simple answer , but, my experience is limited. Guess I need to get a fuel pressure gauge & plumb it in on the main pump to carbs line somehow .Comment
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Re: 67 Holley 2300 Problem
Ralph, first check for proper fuel pressure, 6psi. if that ok remove front and rear linkage off carbs., remove all 3 needle and seat and check for dirt in each one of them , if ok install needle and seat and set the float level with side plug off so the fuel just come out, you may want to remove coil wire so you can crank the engine and fill the bowl and if the float still hang up then the float and shaft are sticking somewhere going up and down.5 All Oringinal Fuel lines.jpgComment
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Re: 67 Holley 2300 Problem
If you remove the coil wire from the distributor cap, be sure to ground it so you do not damage your TI ignition.Comment
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Re: 67 Holley 2300 Problem
I rebuilt my carbs on my 69 L71 and AAR Cuda recently. Very similar carbs. After I completed and set them up I had a similar problem that you are describing in the Cuda. Somehow I had gotten trash in the needle and seat in the front carb. I also needed to adjust the float levels on all the carbs a little high to get both cars running correctly. I had read that on a tech tip on a Mopar site. I had good luck with both cars after cleaning the needle and seat very well and adjusting the floats as described.Comment
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Re: 67 Holley 2300 Problem
Thanks, everyone.... All 3 fuel valves are new Holley's & float levels were set a little low before I started the car. As noted, the fuel pump has been on the car for many years operating OK . The most perplexing thing to me is that all 3 carbs were obviously flooded as fuel poured from each sight plug when I removed the screw immediately after it shut down. It just seems beyond reason that all 3 carbs were affected unless the fuel pressure spiked for some reason from the same old pump ! Can this happen?
OH, how do you connect a fuel pressure gauge to the tri-power fuel lines?Comment
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