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

Pump fails to draw water and prime itself — check for air leaks in the suction line connections, ensure the suction hose is not kinked or cracked, verify the suction lift does not exceed the rated maximum height, and check that the pump housing is filled with water before starting

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error WONT PRIME on the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine means: Pump Will Not Prime. The top-ranked community fix is “Inspect and Replace Pump Housing Seal and Check Suction Lift Height” (medium difficulty, ~75 min, DIY cost: $15-$25). 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: $140-$200.

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

Carburetor Clogged

Pump Cavitation

Engine Will Not Start

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

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

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

Error code WONT PRIME on the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine means: Pump Will Not Prime. Pump fails to draw water and prime itself — check for air leaks in the suction line connections, ensure the suction hose is not kinked or cracked, verify the suction lift does not exceed the rated maximum height, and check that the pump housing is filled with water before starting

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

The most successful fix is "Inspect and Replace Pump Housing Seal and Check Suction Lift Height" (medium difficulty, ~75 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code WONT PRIME 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 WONT PRIME myself?

Yes — the top-ranked community fix ("Inspect and Replace Pump Housing Seal and Check Suction Lift Height") is rated medium difficulty and takes about 75 minutes. Tools needed: T30 Torx screwdriver, Adjustable wrench, Flashlight.

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

DIY cost: $15-$25. Professional repair typically costs $140-$200. 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), ENGINE WONT START (Engine Will Not Start), LEAKING (Pump Leaking Water), LOW FLOW (Low Water Flow Output), and 2 more.

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)
ENGINE WONT START — Engine Will Not Start (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)

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