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Discussion Starter · #1 ·
I have a tank sprayer for my Gravely. It had a Hypro piston pump that sort of worked but leaked and was totally rusted. So I bought a new Hypro pump to replace it. I replaced the lines and added a Hypro pulse damper (precharged to 800 psi)on the output. The new pump is rated 500 psi and 2gpm. The pump will quickly pump up to 500 psi and when I pull the spray trigger I get a great spay pattern but the pressure immediately falls to zero. I thought I might have received a bad pump so I borrowed another and installed it with the same result. I am at wits end to know what is going on. Would appreciate comments. Thanks
 

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Smaller tip means it will spray farther too.

There is difference netween pressure and volume of a pump. Pump manufacturers give two ratings. One is max flow (usually at 0 psi) and the other is max pressure at 0 flow (gpm). Finding a nice balance is tough.
 
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