How does an acceleration pump work?
Just like a bathroom plunger, a rod pushes on a rubber diaphragm,which plunges into a reservoir of fuel, forcing the fuel into a small orifice, which leads to the intake tract. When you turn the throttle, a cam is activated by an adjuster screw to engage an arm that pushes on the rod.
How do you know if an accelerator pump is bad?
Signs that your accelerator pump may need to be replaced include: Car does not accelerate smoothly when gas pedal is pressed hard (note: a bad accelerator pump does not affect slow acceleration, only fast acceleration) Engine stalls or stutters during hard acceleration. Exhaust smoke.
Can a bad accelerator pump cause stalling?
Another symptom of a faulty accelerator pump is engine sputtering or stalling. The sputtering is caused by the lack of fuel that is supposed to be provided by the accelerator pump when throttle is rapidly pressed.
How do you know if your accelerator pump is bad?
Signs that your accelerator pump may need to be replaced include:
- Car does not accelerate smoothly when gas pedal is pressed hard (note: a bad accelerator pump does not affect slow acceleration, only fast acceleration)
- Engine stalls or stutters during hard acceleration.
- Exhaust smoke.
How do I know if my accelerator pump is bad?
You should be able to manually pump the accelerator pump arm, and watch fuel squirt. If not, you got the gasket in wrong, or the diaphragm in the pump assembly is messed up. In older carbs, they used a check ball under the pump diaphragm.
Why won’t the accelerator pump arm work?
I would make sure the shooter nozzle assembly allows the check ball assembly to come up. Put the check ball assembly in, but no shoot nozzle and LIGHTLY actuate the accelerator pump arm. See if fuel flows. Maybe the wrong shooter nozzle or wrong check ball assembly. Something goofy like that. You blew through the shooter assembly right?
Why is my check ball assembly not working?
I would make sure the shooter nozzle assembly allows the check ball assembly to come up. Put the check ball assembly in, but no shoot nozzle and LIGHTLY actuate the accelerator pump arm. See if fuel flows. Maybe the wrong shooter nozzle or wrong check ball assembly. Something goofy like that.
What is the purpose of the check ball on the carburetor?
It functions as a check ball assembly to stop any siphon affect. You should be able to manually pump the accelerator pump arm, and watch fuel squirt. If not, you got the gasket in wrong, or the diaphragm in the pump assembly is messed up. In older carbs, they used a check ball under the pump diaphragm.