JOHN DEERE S120 Stalls Under Load
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
93%
CONF
|
Vacuum Fuel Pump
The engine uses a pulse-driven pump that operates on crankcase vacuum. Over time, the internal rubber diaphragm can stretch or develop micro-tears, which limits its ability to supply sufficient fuel volume when the throttle opens under load. Replacing the pump restores the fuel pressure necessary to keep the carburetor float bowl full during high-demand cycles.
|
VIEW ON AMAZON
#CommissionsEarned
|
|
4%
CONF
|
Fuel Filter
Under high load, the engine's fuel consumption increases significantly. A partially clogged filter acts as a flow restrictor; while it may pass enough fuel for a low-RPM idle, the increased fluid friction at higher flow rates causes a pressure drop that starves the engine, leading to a lean-out stall.
|
VIEW ON AMAZON
#CommissionsEarned
|
|
3%
CONF
|
Air Filter Element
Stalling under load can occur if the engine cannot achieve the necessary volumetric efficiency. If the air filter is saturated with debris, the engine cannot draw in enough oxygen to match the increased fuel delivery commanded by the governor, resulting in an overly rich mixture that lacks the energy to maintain crankshaft momentum against the load.
SKU: MIU11515
|
VIEW ON AMAZON
#CommissionsEarned
|
DIY Repair Guide
Watch exactly how to replace the Vacuum Fuel Pump.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.