fuel problem?

B

bama85

New member
I have a 1976 Scout II with the 345. I recently refurbed the 2300 carb. The problem that im having now is that I can only get the truck to start if I poor gas in to the bowl of the carb. It runs great for a minuite or two until it runs the gas out of the bowl. It has a new fuel pump and filter. Ive also unhooked the fuel line to ensure the gas is pumping. My only thought now is maybe a float adjustment problem. I installed and set a new float and tried the old float with no noticable differance. Any suggestions would be greatly apprecieated. Thanks
 
So the original Holley 22xx carb has been replaced by a Holley 2300 in the past???

If in fact what you are dealing with is a 2300, then those carbs are super-simple to make the fuel bowl system work properly. The first thing that should be done is discard the tiny fuel filter inside the fuel inlet boss and add a large capacity external filter that you can see.

Then set the fuel level in the carb by removing the brass side plug from the bowl and then altering the fuel needle position until the fuel level can be seen just below the level of the threads in the sight hole. This is also done with the engine running.
 
Ran a fuel line to a gas can to be sure I didnt have a bad line somewhere and got the same result. Ive noticed that the fuel filter does not have much gas in it when the truck is running probly less than 1/4 full is that typical or should it have more?
 
Ok, since the carb is actually a 22xx, that changes the game a bit!

The clear fuel filter will never show to be completely full or even half full. I'm not certain why that is but the filter appearance is not an indicator of a fuel delivery issue.

The fuel pump should produce a nominal 5psi of outlet pressure and a volume of one pint of liquid in 20 seconds of engine crank. If you get that result then fuel delivery is not the issue.

The only adjustment to the fuel level contained in the bowl is by adjusting both the shut-off point and the "drop" of the float. That is a simple bending of the float arm as described in the instructions. So verify that setting again. Also while you have the carb top off for doing that, make certain that the fuel inlet is completely clean with no obstruction of any kind.

Something is preventing full fuel flow into the carburetor fuel bowl.
 
I swaped the old carb for a 2300 it cranks right up but it idles rough then it goes dead. I havent made any adjustments other than removing the internal filter. So are there any tuning secrets I need to know.
 
This sounds like some boneyard piece in unknown condition. A new unit should run fairly well right out of the box. What's the list number of the 2300?
 
bama85 said:
I swaped the old carb for a 2300 it cranks right up but it idles rough then it goes dead. I havent made any adjustments other than removing the internal filter. So are there any tuning secrets I need to know.
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Is this newly acquired 2300 a fresh unit? Or has it been sitting for months/years with fuel residue inside?

If it's a boneyard-type unit then it needs a full rebuild! Any carburetor that has been sitting for months with fuel residue inside is going to to be really nasty. That is why they must be rebuilt on a regular basis.
 
Its a brand new one. Ive been messin with with the float level but I cant seem to get it to the sight port? Stock jets at 675 ft elevation.
 
You have a fuel upply issue. Either the pickup in the tank is blocked or the pump is bad. Could also be an air leak before the pump put a fuel pressure gauge on it just before the carb and do your run deal. Read the pressure. Guess it is zero.
 
bama85 said:
its a brand new one. Ive been messin with with the float level but I cant seem to get it to the sight port? Stock jets at 675 ft elevation.
Click to expand...

If the 2300 is new, then it should be a list # 0-7448.

Hopefully it is not a list 4412 which will not work on that application.
 
Good! Back to what rk said. Is your pump pumpin'? Pinched or partially blocked fuel line between the tank and the pump mebbe? Check 'em.
 
Yes the pump and filter are both new and seem to be pumping fine. Have checked the lines and tried runing from an external gas can.
 
I have found the issue it is either the pickup in the tank or the line before the fuel pump. I actually flooded it out today because I had the float level way to high. Soon as I started runing on the external tank and line it flooded. So atleast I got the problem narrowed down. Thanks for all your help on this.
 
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