About 1/64" from bottoming out when throttle is wide open.
Im guessing you have a carb, the accelerator pump is in it.
Carb needs adjustment? Accelerator pump needs replacement? Choke needs adjustment? If you have a diesel you might want to check the glow plugs.
32mm keihin with accelerator pump
Pump is on front of Carb. square panel with four screws.
On my engine,the accelerator pump on the Carb is going bad, 350 engine with quadrajet carb
To adjust the accelerator pump on a Weber carburetor, first locate the adjustment screw on the pump mechanism. Turn the screw clockwise to increase the pump's output or counterclockwise to decrease it. After making adjustments, ensure the throttle is fully closed and check for a proper squirt of fuel when the throttle is opened quickly. Fine-tune as necessary to achieve optimal performance without flooding the engine.
first of all is it injectors or carb, if a carb it could be a bad accelerator pump
To set the accelerator pump on a Holley 600 carburetor, first ensure the engine is off and cool. Remove the air cleaner and locate the accelerator pump linkage on the side of the carburetor. Adjust the pump arm by changing the position of the linkage or using the adjustment screw to achieve a slight amount of play—typically around .015 inches when the throttle is closed. Test the adjustment by opening the throttle and observing if the pump squirts fuel immediately; if not, fine-tune the adjustment until you achieve a quick, responsive squirt.
if it runs fine until you push the gas pedal the accelerator pump may be bad if it has a carb on it.
a double pumper is a 4 barrel carb. commonly made by holley. they were called this because they have two accelerator pumps. one on each float bowl on either end of the carb. most carbs do not have this feature, they usually only have one accelerator pump.
carb problem my guess would be accelerator pump or stuck power valves in carb.
Yes, you can adjust the accelerator pump on a Holley 600 carburetor. This adjustment is typically made by changing the pump lever's height or by swapping out the pump nozzle size to alter the fuel delivery. Proper adjustment helps improve throttle response and prevent hesitation during acceleration. Always refer to the Holley manual for specific instructions and settings for your model.