Why Your Sewer Jetter Is Losing Pressure (And the Parts That Could Be to Blame)
Few things are more frustrating on a job site than pulling the trigger on your sewer jetter and realizing the pressure just isn’t there. Reduced PSI means slower cleaning, incomplete blockages, and wasted time — especially during the busy season.
If your sewer jetter is losing pressure, the issue often comes down to a handful of common wear parts. Here’s how to diagnose the problem and determine what may need to be replaced.
Worn or Damaged Nozzles
Your nozzle plays a major role in maintaining cleaning power. Over time, high-pressure water erodes the orifice openings, causing them to widen. When this happens, water flow increases but pressure drops — reducing cutting and flushing effectiveness.
Signs your nozzle may be the problem:
- Weak thrust
- Uneven spray pattern
- Reduced cleaning performance
- Visible wear at jet openings
If you haven’t replaced your nozzle in a while, it may be time to upgrade to a new sewer jetter nozzle designed for your PSI and GPM range. Fresh nozzles restore performance instantly.
Clogged Filters or Strainers
A partially blocked filter restricts water flow before it even reaches the pump. This forces your system to work harder and often results in inconsistent pressure output.
Check for:
- Debris buildup in inlet filters
- Sediment in strainers
- Fluctuating pressure readings
Cleaning may solve the issue, but worn or damaged filters should be replaced to prevent long-term pump damage.
Failing Pump Seals or Valves
Your pump is the heart of your sewer jetter system. If internal seals or valves are worn, pressure loss is almost guaranteed.
Watch for:
- Water leaks near the pump
- Pulsing pressure
- Excessive vibration
- Overheating
Seal kits and pump repair kits can restore proper pressure and extend the life of your equipment — especially if caught early.
Leaking Fittings or Ball Valves
Even small leaks in fittings or valves can cause significant pressure loss. Over time, vibration and regular use can loosen connections or wear down internal components.
Inspect:
- Ball valves for smooth operation
- Couplers and quick-connect fittings
- Threaded connections for visible leaks
Replacing worn valves or fittings is often a simple fix that restores full system pressure.
Damaged or Aging Sewer Jetter Hose
Your hose takes constant abuse — dragging across pavement, bending around corners, and operating under extreme pressure.
Common hose-related pressure issues include:
- Internal collapse
- Kinks restricting flow
- Bulging or soft spots
- Leaking at fittings
If your hose is several seasons old or showing visible wear, replacing it may be the safest and most effective solution.
Don’t Let Pressure Problems Slow You Down
Pressure loss rarely fixes itself. The longer you run your equipment with worn components, the more strain you put on your pump and the more downtime you risk.
At SewerShop.com, you’ll find the sewer jetter parts and accessories you need to restore full performance — from nozzles and hoses to pump repair kits, filters, valves, and fittings. If you're unsure which part is causing the issue, our Parts team can help you identify the right replacement quickly so you can get back to work with confidence.