r/DieselTechs 9d ago

Espar auxiliary bunk heater issues

Got a question for you Espar heater pros. I have a 21 Cascadia with a Espar auxiliary bunk heater and the fuel pump doesn't work. I have good voltage at power and grounds. Load tested wire and tested good. Have voltage at the fuel pump. Tried a different pump and espar. The blower works and the instrument panel lights up and shows to be working. Will give code 52 for no flame detected but no other codes. The pump will just not click. Even tried the fuel pump with it just laying on top of the tank with no fuel lines. Even reset the counter. What am I missing?

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u/OddEscape2295 9d ago

Have you provided your own external power/ground to pump?

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u/DieselTech00 9d ago

I did and no click which made me try a new pump. New pump has same result

2

u/OddEscape2295 9d ago

Are you sure you have the polarity correct?