I am sure you could port them easily enough. Just like how grafitti artists port their spray bomb nozzles for different patterns.
Or you could just make your own also.
A few of the fuel pumps that I have seen around are like 2 GPM or so. I still don't know if they would be able to shove the volume though.
The piston pump idea is good. Especially if you have a 2 cylinder model. BUT, there is a very bad draw back too piston pumps. They heat up the water considerably. I used to work for a high pressure washing company. And we pushed 16GPM @ 10,000 PSI. The water was a little warmer than luke warm when it came out. We felt the water when it came out of the bypass tube on our gun of course hehe.
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