I have been running the Shurflo pump for a year now, and within a month of installing it, there was a small amount of leakage at the pump switch. I have a high boost setup that may have contributed to that, since the pump was not set to turn on until 19 psi. The leakage started getting worse about a month ago. Anyway, I recently installed a snowperformance controller, and while tuning it in, the problem then got much worse, and also I could not get the knock to go away, and I noticed that the green light was not cycling. I dead-headed the pump in the garage for some testing, and found that at anything above 20psi pump pressure, water/meth was squirting out of the pump head, and the pump was never reaching full pressure!
I took apart the switch, and noticed that the tan seal on the piston that activates the pressure switch was torn. I was going to try ordering the repair parts, but I was not sure it would be worth spending the money on repairing a $70 pump. After looking the situation over, I decided to try the following. I removed the piston completely, and installed a thin rubber gasket between the switch and the pump. So far it works great. The pump cycles as it should when I increase the voltage. Even with the piston removed, the pressure is trapped by the gasket, and it pushes on the switch and activates it. In a few days of testing, the switch is staying bone dry. I also installed a check valve after the pump, and that may have also helped.
If the rubber doesn't hold up to the meth, I have purchased some sheet teflon at the hardware store and will try that next.
Just thought I'd pass that info along, and I will report any problems I encounter with this solution.
I took apart the switch, and noticed that the tan seal on the piston that activates the pressure switch was torn. I was going to try ordering the repair parts, but I was not sure it would be worth spending the money on repairing a $70 pump. After looking the situation over, I decided to try the following. I removed the piston completely, and installed a thin rubber gasket between the switch and the pump. So far it works great. The pump cycles as it should when I increase the voltage. Even with the piston removed, the pressure is trapped by the gasket, and it pushes on the switch and activates it. In a few days of testing, the switch is staying bone dry. I also installed a check valve after the pump, and that may have also helped.
If the rubber doesn't hold up to the meth, I have purchased some sheet teflon at the hardware store and will try that next.
Just thought I'd pass that info along, and I will report any problems I encounter with this solution.
