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ENGINE WONT START

Honda · WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine

Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine ENGINE WONT START Error Fix: Engine Will Not Start

Pump engine fails to start — check that fuel is fresh, choke is engaged for cold starts, engine switch is ON, spark plug is clean, oil level is adequate, and the air filter is not clogged

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error ENGINE WONT START on the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine means: Engine Will Not Start. The top-ranked community fix is “Clean and Replace Spark Plug and Air Filter” (medium difficulty, ~30 min, DIY cost: $10-$20). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · water pump

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many water pump repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $120-$180.

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Other Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine Error Codes

Carburetor Clogged

Pump Cavitation

Pump Leaking Water

Low Water Flow Output

2 fixes

RUN DRY DAMAGE

Pump Ran Without Water

2 fixes

SURGING

Engine Surges or Hunts

2 fixes

WONT PRIME

Pump Will Not Prime

2 fixes

People Also Ask About Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine Error ENGINE WONT START

What does error code ENGINE WONT START mean on a Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine?

Error code ENGINE WONT START on the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine means: Engine Will Not Start. Pump engine fails to start — check that fuel is fresh, choke is engaged for cold starts, engine switch is ON, spark plug is clean, oil level is adequate, and the air filter is not clogged

How do I fix error code ENGINE WONT START on my Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine?

The most successful fix is "Clean and Replace Spark Plug and Air Filter" (medium difficulty, ~30 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code ENGINE WONT START on a Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine error ENGINE WONT START myself?

Yes — the top-ranked community fix ("Clean and Replace Spark Plug and Air Filter") is rated medium difficulty and takes about 30 minutes. Tools needed: 5/8-inch spark plug socket, Ratchet wrench, Phillips screwdriver, Wire brush.

How much does it cost to repair Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine error ENGINE WONT START?

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine have?

The Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine has 7 other known error codes, including: CARBURETOR CLOGGED (Carburetor Clogged), CAVITATION (Pump Cavitation), LEAKING (Pump Leaking Water), LOW FLOW (Low Water Flow Output), RUN DRY DAMAGE (Pump Ran Without Water), and 2 more.

Which other Honda models have the ENGINE WONT START error?

Error code ENGINE WONT START also appears on 15 other Honda models: EB10000 10000 Watt 120/240V Industrial Generator with Electric Start and CO-MINDER, EB2200i 2200 Watt OSHA Compliant Industrial Inverter Generator with CO-MINDER, EB5000 5000 Watt 120/240V Industrial Generator with Honda iGX390 389cc Engine and GFCI Protection, EB6500 6500 Watt 120/240V Industrial Generator with Honda iGX390 Engine and GFCI Protection, EG4000 4000 Watt 120/240V Economy Generator with CO-MINDER, EM5000SX 5000 Watt 120/240V Deluxe Generator with Electric Start and iAVR, and 9 more. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine have?

The Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine has 7 other known error codes:

CARBURETOR CLOGGED — Carburetor Clogged (2 fixes)
CAVITATION — Pump Cavitation (2 fixes)
LEAKING — Pump Leaking Water (2 fixes)
LOW FLOW — Low Water Flow Output (2 fixes)
RUN DRY DAMAGE — Pump Ran Without Water (2 fixes)
SURGING — Engine Surges or Hunts (2 fixes)
WONT PRIME — Pump Will Not Prime (2 fixes)

Which other Honda models have the ENGINE WONT START error?

Error code ENGINE WONT START also appears on 15 other Honda models:

EB10000 10000 Watt 120/240V Industrial Generator with Electric Start and CO-MINDER (industrial generator) · 2 fixes
EB2200i 2200 Watt OSHA Compliant Industrial Inverter Generator with CO-MINDER (industrial generator) · 2 fixes
EB5000 5000 Watt 120/240V Industrial Generator with Honda iGX390 389cc Engine and GFCI Protection (industrial generator) · 2 fixes
EB6500 6500 Watt 120/240V Industrial Generator with Honda iGX390 Engine and GFCI Protection (industrial generator) · 2 fixes
EG4000 4000 Watt 120/240V Economy Generator with CO-MINDER (portable generator) · 2 fixes
EM5000SX 5000 Watt 120/240V Deluxe Generator with Electric Start and iAVR (portable generator) · 2 fixes
EU1000i 1000 Watt Super Quiet Portable Inverter Generator with CO-MINDER (inverter generator) · 2 fixes
EU2200i 2200 Watt Portable Inverter Generator with Honda GXR120 121cc Engine and CO-MINDER (inverter generator) · 2 fixes
EU2200i Companion 2200 Watt Portable Inverter Generator with 30A RV Outlet and CO-MINDER (inverter generator) · 2 fixes
EU3000iS 3000 Watt Portable Inverter Generator with Honda GX200 196cc Engine and Electric Start (inverter generator) · 2 fixes
EU3200i 3200 Watt Lightweight Portable Inverter Generator with CO-MINDER and Bluetooth (inverter generator) · 2 fixes
EU7000iS 7000 Watt 120/240V Inverter Generator with Electric Start and CO-MINDER (inverter generator) · 2 fixes
FG110 9-Inch Mini Tiller/Cultivator with Honda GX25 25cc 4-Stroke Engine (tiller) · 2 fixes
HSS724AWD 24-Inch Two-Stage Wheel Drive Snow Blower with Electric Start (snow blower) · 2 fixes
HSS928ATD 28-Inch Two-Stage Track Drive Snow Blower with Electric Start (snow blower) · 2 fixes

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