What is the procedure to adjust the fuel level in a Holley carb (list#3247) with the external sight plugs? Is is a simple as starting the car, removing the sight plugs, releasing the locking nut then turning the adjustment screw to obtain the desired fuel level? When you release the locking nut will fuel seep out of the area, and in which direction do you turn the adjustment screw (CW or CCW) to raise the fuel level? Any other advice? Thanks
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Re: Adjusting Carb Fuel Level
John -
The locking device is the slotted screw, not the hex nut; you loosen the screw slightly (too much will result in a fuel dribble), make the adjustment with the nut, then tighten the screw to lock it. Turning the nut clockwise lowers the fuel level, counter-clockwise raises it. I find that setting the fuel level about level-to-1/16" below the hole works well. Stuff a rag under the float bowl to catch any dribbles. -
if the rear bowl level is high
you will have to take the car for a ride after turning down the float adjustment because you are using very very little fuel from the rear bowl at idle. you must get the rear barrels to open to take fuel from the float bowl to see where the fuel level will end up. the front can be done in the garage by just reving up the engine so the front butterflys open and pull fuel from the float bowlComment
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Re: if the rear bowl level is high
Clem,
It sounds to me that what I should do is drive the car on the highway, and "step on it" little bit to bring the fuel level up in the rear bowl, then check the fuel level at idle and adjust, front and back, as needed. Is this correct?
JohnComment
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Re: if the rear bowl level is high
John,
Or you could just intentionally pre-set the secondary float quite a bit low before you install the bowl, then follow the same adjustment procedure John H. outlined on the secondary float while it's idleing. Just go slowly so you don't go too far. If it was my car, I'd much rather do it that way than have to rev to p-ss out of it to get the secondary fuel level back down if it was too high. ..............not to mention trying to contain a bunch of fuel that might be pouring out of the site hole before my intake manifold turned into a barbecue grille.
VerneComment
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Re: if the rear bowl level is high
You can open the secondary throttle plates and let it run at very fast idle long enough to pull fuel out of the rear bowl and let the fuel level stabilize.Comment
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correct also if the rear bowl level is too high
to get the correct reading you should take it out and step on it again after the adjustment to lower the float.Comment
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Re: if the rear bowl level is high
But in the meantime, fuel is pouring out of the hole and the fan is blowing it all over the place. I guess it can be done, but I would prefer not to have to worry about that.Comment
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Re: if the rear bowl level is high
Well I think if you had fuel pouring all over the place it would behoove you to put the plug back in and adjust the float down. I just see no need to drive the car when you can pull gas out of the secondary bowl by cracking the secondary throttle plates open and letting it run off the secondaries. I don't recall spilling any extraordinary amount of fuel doing it this way. But, whatever works for ya'.Comment
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Re: if the rear bowl level is high, per mike
You can draw the fuel level down manually. I use the slotted return arm on the secondaries to bring up the idle to draw the fuel down. I first unscrew the sight plug enough to see if any gas seeps out. If it does then I screw it back in and adjust the float down and operate the secondaries and try again until no more seeping of gas from sight hole. I like to do as John has mentioned, setting the level below the sight hole. This helps to prevent flooding after shutting down a hot motor.
WayneComment
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Now Clem, be honest. You just like ....
to go out and giver hell.Comment
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yep,and not always in a corvette *NM*
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you can consider the clear plugs
Holley sells clear sight plugs to replace the brass ones to check the fuel level. Some racers choose to just leave them in. You may want to swap them for your brass ones and adjust to your heart's content without risking a fuel spill. Once you're happy with the level, swap your original brass plugs back in.
MarkComment
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