What pump for 420cc predator

Weinersnitzelz

New member
Hello, I have a 420cc HF predator engine that has an old 4gpm 3500psi pun that's on its last leg. It's a direct drive pump. I do only residential work and use the x-jet M-5 for application of chemicals and a 20" surface cleaner for concrete. I would like to get more gpm as I have a tank to use as a buffer tank but need some advice on which pump to go with. I was looking at the Gp 4040 as a direct replacement but would like some input on maybe converting to belt or gear reduction style pump. By the way, so far the predator engine has been a work horse for almost a year now after my Honda gx390 bit the dust, bought the Predator in a pinch and I've been using it ever since.

Sorry for the long post!


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You could replace it with an EZ4040, or, for more volume, go with the AR RKV 5 or 5.5.
 
I believe the popular formula for figuring out horsepower is PSI x GPM ÷ 1100. Russ has a different one that is likely a little more accurate though. 13 HP can do 8 GPM at about 1800 PSI, 5 GPM at about 3000 PSI, etc. 5.5 at about 2500...

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