See full version: Why is carb float bowl empty after sitting
The truck should fire right up but after sitting for a few days (or maybe longer) the float bowl in the carburetor is empty.
So it takes quite a bit of cranking (about 15-20 cranks) for the mechanical fuel pump to pull fuel all the way from the tank and fill the bowl.
I’m certainly far from an expert but I know enough that I have cured many problems with Q Jets over the years. Weather you follow my suggestions or not I really don’t give a damn.
Oh..and all of the plugs are prone to leaking. [links]
I agree with Bill, that is allot of really unnecessary work to tap and fill, just epoxy and be done with it.
Adjusting Idle Mixture Doesn’t Change RPM [links]
Replace the main discharge ball, spring and T. Run thin wire through all of the passages in the venturi cluster and then replace it. Don’t forget the gasket.
Installing Jets
The bigger orifice jet goes in the primary side.
A piece of paper towel folded over the screwdriver blade will hold the part, or a screw, until it gets started in the hole. (sometimes it helps to dampen the paper towel a bit)
Replace the main discharge check ball and using a brass drift punch, hold the check ball down so that the hole seals. You should now get some resistance when pushing the accelerator pump down. If you get fuel out of the main discharge while holding down the check ball, then use a brass drift punch to gently tap on the check ball. This will reform the check ball hole. Don’t hit too hard, or the check ball might get stuck.
I soaked and cleaned my 2 carb both the 1 inch for a chev . One of them starts and idles good but when you try to raise the rpms it swings frm 1000 to 3000 rpms. It accelerates good if you push the pedal down but if you try to hold the rpms at like 3000 it swings up and down. Ive set the pump and metering rods per your specs and cant make it any better.
Test the check ball by taking the top off. Fill the float bowl. The check ball will lift up by the weight of the gas and allow fuel to flow into the well. For those that don’t use a check ball, the well if filled by coming over the slot in the side of the pump well. In other words it splashes over from the float bowl. If the well doesn’t fill up, then the passage is probably plugged up. Run thin wire through the passage. Ethanol will leave residue behind that cleaners cannot get out.
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