Thermo king apu not running need help?

if you changed the filters, like I did last fall.

I cracked one of the fuel lines for the injectors at the pump. It let the air bubbles out and helped prime the pump.

 

Check the fittings on the pump and the plastic lines to them. I have had the fittings work loose from the compression fittings, and had one plastic line rub thru against another one. None of that is visible unless you remove the cover.

You may want to make sure the off switch under the cover was not tripped and be sure the breaker button is in on the control box in your side luggage compartment too.

 

my apu has same engine as thermo king, i have an electric fuel pump in between the two filters. see it it has power. check all the fuses.

 

It hasn't been mentioned so I must ask, "Did you bleed the system"? If you don't give it a means for the air to escape it will dead pump.

Do you have any alarm codes stored?

 

uh, yeah it was......

 

What is the fuel level in the tank you are drawing from, if it is less than a quater, the apu may not be pulling fuel from the tank.

Good Luck,
Larry

 

mine has the same motor, fuel pump wires broke from vibration just inside the pump, found them by wiggleing the wires, installed new lift pump, got it squirting , been great ever since

 

uh, by the OP!

 

Just before engine starts to turn over after the buzzing noise quits from preheat mode. You should here the electric lift pump kick on.