Low pressure option on fuel pump

[Alfredo]

On my last flight I tried the cooling effect of the low speed fuel pump while at altitude and climbing. The fuel pump did not turn on. I checked again after landing and it did not work. The high speed/pressure does work. On my normal operation I never use the low pressure option until now that I wanted to check if it help me controlling the CHT temperature. Any ideas where I should start looking?

[Todd Peterson]

It could be either the switch or the resistor. When using high boost the switch directs the current directly to the boost pump. When in the low boost position the switch directs the current through a resistor then to the pump. It could also be a broken wire or connection in the low boost circuit. It shouldn't take long to trouble shoot.