You can run two Aquamist pumps with at least 2 accumuators. Both pumps should be tired together. With two pumps and two acuumulators you will have full water flow for about 20sec.
If you use the 239 shurflo pump you can run as long as the water in the tank lasts.
The 239 has proven reliable for this aplication. The 238 would work but for the power you are after the 239 is my chose.
The 239 is set down to 110psi so that it does not over power the highspeed valves and to prolong its life. Yes the 239 is over kill but the extra reserve is worth it.
One pump should be enough. Do you drive the car every day or is it a drag car?
When using two aquamist pumps allways have them feed a common system, do not have two parrall system as they will not be balanced.
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Brad
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