How to Fix Shurflo 4008 Pressure Switch Failure: Complete DIY Repair Guide
Every time I turn on a faucet in my new RV, this Shurflo 4008 water pump just won't quit running like it's stuck in overdrive! 🏃♂️ Even when I'm not using any water, this thing is chugging away like it's got somewhere important to be.
I'm pretty sure it's the high pressure microswitch acting up. As I learned, this can cause the pump to run continuously due to a high resistance short. The good news is you have multiple repair options:
- Replace just the microswitch
- Replace the pressure housing (3 screws)
- Or swap the entire pump (about $73 on Amazon)
Has anyone dealt with this before? I'd love to avoid replacing the entire pump if possible, but I'm also tired of listening to this mechanical marathon runner! …more
I'm pretty sure it's the high pressure microswitch acting up. As I learned, this can cause the pump to run continuously due to a high resistance short. The good news is you have multiple repair options:
- Replace just the microswitch
- Replace the pressure housing (3 screws)
- Or swap the entire pump (about $73 on Amazon)
Has anyone dealt with this before? I'd love to avoid replacing the entire pump if possible, but I'm also tired of listening to this mechanical marathon runner! …more
