Record which transfer mode is affected
Slow gravity discharge, slow pumping and slow filling are different observations. Record the affected modes and individual outlets so the technician can narrow the checks. A blocked vent can resemble a pump or valve fault; suction air entry can reduce flow without a visible water leak.
Observe visible leaks from a safe position and stop transfer when containment is compromised. Increasing drive speed or pressure can make the problem worse. Do not defeat vent protection, open a pressurized tank or seal an unidentified crack as a substitute for diagnosis.
Keep venting, suction, drive and downstream restrictions separate
Qualified personnel need the installed-system instructions and the operating context to distinguish these possibilities. The water class also matters: repair parts, lubricants, sealants, hoses and post-service cleaning must remain compatible with the delivery duty.
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| Decision | What to establish | Condition or limit |
|---|---|---|
| Mode isolation | Compare gravity, pumped, fill and individual outlet paths. | One slow mode does not prove the tank or pump is defective. |
| Tank breathing | Check the approved vent and overflow path without unsafe opening. | Never defeat vent protection or open a pressurized tank. |
| Suction and drive | Verify priming, filter, air entry and approved drive condition. | Raising speed can worsen cavitation or damage. |
| Leak control | Identify, contain, repair and retest the exact source. | Sealant on an unknown crack or incompatible wetted part is not an approved repair. |
Request a traceable repair and repeat check
Send the tank and equipment identities, mode comparison, leak location and recent service history. Keep the exact cause, approved repair and verification with the record. This guide authorizes neither pressure work, welding nor internal tank repair.
Information to send with the service request
- Affected fill or discharge mode
- Water level, water class and recent service
- Valve and vent position
- Pump, drive, priming and filter condition
- Hose, elevation and receiver interface
- Leak location, rate and operating condition
Records to request and keep
- Complaint and mode record
- Isolation, vent, valve and hose inspection
- Before-and-after flow or time comparison
- Repair material, part identity and repeat-test record
Common mistakes and what to check instead
- Replacing the pump before checking the vent: Follow the complete flow path from tank breathing to receiver.
- Increasing speed to recover flow: Stay within the installed pump and drive instructions.
- Returning potable equipment without post-repair release: Repeat required cleaning and water-quality controls.
Service and safety limits
This page does not authorize pressure work, welding or internal tank repair.
Qualified personnel and the installed manuals control diagnosis and repair.
Remove the tanker from service for structural leakage, unsafe pressure, contaminated potable duty, abnormal pump behavior or failed controls.
Sources and applicability
Controls the project-input, quotation, approval and inspection workflow described in this guide.
Provides public checklists and worksheets; the signed project documents remain controlling.
Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Primary public guidance for tanker suitability, cleaning, hoses, delivery planning and potable-water controls. It does not approve a vehicle or replace local water rules.
Manufacturer example supporting tank, pump, PTO, valve and leak checks. Its component limits are model specific and not KEEYAK ratings.