High Flow Petrol Water Pump Kit | Honda WB30, 1,100 L/min
Built for the job
Petrol high flow pump kit for large scale dewatering, flood response and water transfer
Over a thousand litres a minute, with 80mm hose on both sides so almost none of it is lost to friction.
This FPS Engineered™ kit pairs the Honda WB30 with 10m of 80mm reinforced suction and delivery hose and 10m of 80mm layflat for the discharge. The pump supplies its own couplings, washers, clips and strainer, so the kit completes it.
The WB30 is the biggest of the Honda petrol pumps, a 5.5hp GX160 driving a 3 inch pump that moves up to 1,100 litres per minute. Where a 2 inch pump has to be left running for hours, this one gets the water gone. It is the pump for flooded fields, large yards, lagoons, deep excavations and anything where the volume of water rather than the height is the problem.
Part of our wider engine driven pump, Honda, pump kit and flood defence ranges.
Why a surface pump needs two different hoses
A submersible sits in the water. A petrol pump sits on the bank, and has to pull the water up to itself first.
That changes what the hose on the intake has to do. As the pump draws, pressure inside the suction hose drops below atmospheric and an ordinary hose flattens shut. Reinforced suction and delivery hose has a helix moulded into the wall that holds it open against that vacuum. Layflat on the suction side simply will not work: the pump pulls it flat and loses prime.
On the discharge side the hose is under pressure, which holds it open by itself. That is where layflat belongs: lighter, cheaper per metre, and it rolls flat to a fraction of the space for transport.
Ten metres of reinforced on the suction, ten metres of layflat on the delivery. The reinforced length also gives you room to reach down a bank or into a lagoon without moving the pump.
At a glance
- Around 1,010 litres per minute through the kit: Roughly 60,000 litres an hour at a typical 2m lift.
- Both hoses supplied: 10m reinforced for suction, 10m layflat for delivery, both 80mm.
- 80mm bore throughout: The full 20m run costs under 3m of head at 1,000 L/min, so you keep 92% of the pump's rated output.
- Honda GX160, 5.5hp, with Oil Alert: Shuts the engine down if oil runs low.
- Handles solids to 6mm, so it copes with silty and gritty site water.
- Suction lift to 7.5m, though shorter is always better for priming.
- No power supply needed, which is the point of a petrol pump on a flooded site.
What's included
- 1 × Honda WB30 petrol water pump, with hose couplings, washers, clips and suction strainer
- 1 × 10m length of 80mm reinforced suction and delivery hose
- 1 × 10m length of 80mm layflat delivery hose
Petrol and oil are not included. The GX160 runs on straight unleaded with no mixing, and has a 3.1 litre fuel tank, which is a little under two hours of running.
Expected performance
Estimated flow through the full 20m of 80mm hose supplied. Total lift is the suction lift plus the delivery lift added together, measured from the water surface to the point where the hose discharges.
| Total lift | Typical situation | Estimated flow | Per hour |
|---|---|---|---|
| 2m | Flooded field, yard or car park, ground level discharge | Approx. 1,010 L/min | Approx. 60,500 litres |
| 5m | Ditch, lagoon or excavation up to a road drain | Approx. 950 L/min | Approx. 57,000 litres |
| 10m | Up a bank, or filling a raised tank | Approx. 850 L/min | Approx. 51,000 litres |
| 15m | Steep ground or high storage | Approx. 735 L/min | Approx. 44,000 litres |
| 20m | Serious elevation, still moving real volume | Approx. 590 L/min | Approx. 35,000 litres |
Estimated using the published WB30 performance figures and Hazen-Williams friction for 80mm bore across the full 20m of hose supplied. At 950 litres per minute a 1,000 litre IBC fills in about a minute, and a 200m² warehouse floor under 100mm of water, some 20,000 litres, is gone in around twenty minutes. Work out a specific run with our pump performance calculator.
Why the 80mm hose matters more than it looks
Friction rises steeply with flow, so on a high volume pump the hose bore decides what you actually get.
The full 20m of 80mm in this kit costs under 3m of head at 1,000 litres a minute. Put the same water through 50mm hose and you would lose more than 18m, which is most of the pump's head and most of its output with it.
That is why this kit keeps about 92% of the WB30's rated flow, where a 2 inch kit on a long 50mm run keeps closer to three quarters. If you extend the discharge, extend it in 80mm. Reducing down to 50mm to reuse hose you already own will cost you more than the hose is worth.
How the kit connects, and how to prime it
Both ports on the WB30 are 80mm, 3 inch. The reinforced hose goes on the suction side with the strainer fitted to the far end, and the layflat goes on the discharge. Secure each with the clips supplied with the pump.
Fit the strainer every time. It comes with the pump and it is not optional. The WB30 passes 6mm solids, and the strainer is what stops anything larger reaching the impeller.
Prime before starting. The WB30 is a self priming centrifugal pump, but self priming means it will clear air from the suction line once the casing is wet, not that it starts dry. Fill the pump casing with water through the priming plug until full, then start the engine. Running dry destroys the mechanical seal.
Keep the suction lift as short as you can and the suction hose as straight as you can. Maximum suction lift is 7.5m, but priming takes longer the higher the pump sits above the water, and every bend on the intake side costs you more than one on the discharge.
Which Honda pump kit?
All three are Honda 4 stroke petrol pumps. Choose by how much water you need to move.
| Kit | Ports | Max flow / max head | Weight | Choose it when |
|---|---|---|---|---|
| WX10 Transfer | 25mm | 140 L/min, 36m | 6.1kg | Portability and height matter more than volume |
| WB20 Flood & Site | 50mm | 620 L/min, 32m | 21kg | The general-purpose standard for site, farm and flood |
| WB30 High-Flow | 80mm | 1,100 L/min, 28m | 26kg | Maximum volume for large dewatering and flood |
Buy the WB30 kit when the sheer volume of water is the constraint. It moves nearly twice what the WB20 does, and because it runs 80mm hose it holds on to that advantage over a long run rather than giving it back to friction. If you need more head than volume, or you are working on your own and lifting the pump in and out of a van single handed, the WB20 is the better buy at 5kg lighter with 4m more head.
Technical specification
| Specification | Honda WB30 |
|---|---|
| Pump type | Petrol engine driven self priming centrifugal surface pump |
| Maximum flow | 1,100 litres per minute |
| Maximum total head | 28 metres |
| Maximum suction lift | 7.5 metres |
| Inlet and outlet | 80mm, 3 inch, both ports |
| Free passage | 6mm |
| Engine | Honda GX160, 163cc, OHV 4 stroke, with Oil Alert |
| Power | 5.5hp, 3.6kW |
| Fuel tank | 3.1 litres, about 1 hour 54 minutes of running |
| Pump dimensions | 385 × 510 × 455mm |
| Pump dry weight | 26kg |
| Kit shipping weight | 44.3kg including both hoses |
| Suction hose | 10m of 80mm reinforced suction and delivery |
| Delivery hose | 10m of 80mm layflat |
| Part number (MPN) | WB30 |
| Warranty | 3 years limited warranty |
What can I use it for?
- Large scale site and construction dewatering
- Flooded fields, paddocks and access tracks
- Emptying lagoons, reservoirs, ponds and large tanks
- Flood water removal from yards, car parks and industrial units
- Agricultural irrigation and bulk water transfer
- Deep excavations and large footings
- Estate, farm and equestrian use
- Hire fleet stock where volume jobs come up
- Emergency response alongside a smaller pump for the residue
Water quality limits
Clean and slightly muddy water, solids to 6mm. Always fit the supplied strainer. It is not a trash or sewage pump, and not for foul water or salt water. It does not treat or filter water, so nothing it moves is drinking water.
Petrol engine safety
Never run a petrol pump indoors or in any enclosed space.
Petrol engines produce carbon monoxide, which is colourless, odourless and lethal. That rules out cellars, basements, garages with the door shut, containers, tents and covered walkways, even briefly and even with a window open. If the water is inside a building, put the pump outside and run the suction hose in, or use an electric submersible instead.
Stop the engine and let it cool before refuelling, keep petrol away from the hot exhaust, and site the pump on firm level ground. At 26kg this is a two person lift into a van, or one person with a sack barrow.
Frequently asked questions
Why do I need this kit if the pump is sold on its own?
Because the pump is supplied without hoses, and a surface pump cannot do anything without them. It needs a reinforced suction hose that will not collapse under vacuum and a delivery hose on the other side. This kit supplies both, correctly sized in 80mm to match the ports.
Why are the two hoses different?
The suction hose works under vacuum, so it must be reinforced or the pump will pull it flat and lose prime. The delivery hose works under pressure, which holds it open, so layflat is fine there and it is lighter and packs down far smaller.
Can I use 50mm hose I already own?
You can fit it, but it will cost you most of the pump. At 1,000 litres a minute, 50mm hose loses over 18m of head across a 20m run against under 3m for 80mm. Reducing a 3 inch pump down to 2 inch hose turns it into a slower 2 inch pump. If you need more discharge reach, add 80mm layflat.
Does self priming mean I do not have to prime it?
No. Self priming means the pump can clear air out of the suction line once its casing is wet. You still have to fill the casing with water through the priming plug before the first start, and running it dry destroys the mechanical seal.
How high can the pump sit above the water?
Up to 7.5m of suction lift, though shorter is always better. Priming takes longer and gets less certain the higher the pump sits, so set the pump down the bank rather than at the top of it wherever you can.
Should I buy the WB30 or the WB20?
The WB30 when volume is your constraint, since it moves nearly twice the water. The WB20 when you want a lighter pump with a little more head, or when one pump has to cover several kinds of job. The WB20 is 5kg lighter and has 4m more head, and for most site, farm and flood work it is enough.
Is a strainer included?
Yes, with the pump, along with hose couplings, washers and clips. Fit it every time: it is what keeps anything larger than 6mm away from the impeller.
Can I run it in a cellar or a barn with the doors shut?
No. Petrol engines produce carbon monoxide, which is lethal in an enclosed space. Site the pump outdoors and run the suction hose in, or use an electric submersible pump instead.
What clears the last few inches?
Nothing with a strainer on it will, because the strainer has to stay submerged. Once the depth drops below the basket, switch to a puddle sucker for the residue. A high flow pump like this is for getting the volume gone, not for finishing a floor.
Full spec sheet
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