[JSMC]

What amp fuse goes in these.  No power in mines but fuse looks ok. Cables also connected

[jk999]

Cheap chinese crap sorry to say this i had quite a few of his backpacks they were ok for first few months then problems once problems start never run ok it was always switches that went faulty

[slap bash]

Open your backpack  up and see what amp the pump is and put in the same amperage as what written on the pump label. It`s could be a 3 or 5 amp fuse.  I have used many of Hewit pumps and his stuff is cheap but still good. I have his 24-volt booster pump for my  pure operating every day for 8 years never missing a day yet.  To many only think things are good when it cost a shed load of money Sure Flow must be the most used pump and yet they give more trouble than most.
P/s most backpacks are not made well I have the Bright yellow from Window Cleaning Warehouse and I have rewired it and it`s only worked well since it`s rewired. Chucked out all the switches and battery and wiring and replaced the lot with soldered wiring. switches and a 12 amp hour battery.

[slap bash]

Use a multimeter set on 20 volt and test to see where the power is not getting to. |Check the battery see if the power is going through the  switch and if it`s got a flow controller check if it`s working. The flow controller is often the culprit. And also the battery  connections> I solder them on as they work loose at the worst possible time.

[JSMC]

Was fuse after all.

[slap bash]

I quick fix then. I find the fuse goes if the pump labours a little due to my pole tap not fully open.