Join Date: Jul 2006
Location: Northfield, Illinois
The check valve on the dripping pump jet may have crud in it. Maybe more than one, do both drip? The passages that feed the pump is buried under the Weber in what I call the "catacomb" passages. The higher cross passage feeds the pump, the lower 2 passages, the starter circuit.
Are BOTH floats set the same? How have you set them?
Below is a diagram of the pump circuit, not a DCOE, but the operating principal is the same. Running, the weight above the ball, diagram parts #21, keeps the ball seated to prevent vacuum ( while running) from sucking fuel from the pump jets. It is possible, the bleed-back or pump exhaust jet (#23) is allowing fuel pick up to the circuit from running vacuum. These are a one way check valve to allow pump fill (#26) without allowing the pump to pump back into the bowl except by the small vent in the side. If the check ball in this jet is stuck up, fuel can be sucked by vacuum through the circuit and dribble while running, but then the pump will not pump properly, giving you variable squirt from the pump jets #24.
Does this help?
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