APU/heat unit broken in truck

I have one and there is an internal fuel screen and a glow plug in them that should be replaced regularly.

Once last winter in very cold and windy temps I did have the very thin fuel line that feeds it gel, so treating the fuel is very important in cold weather.

 

Be careful with the fuel treatments! This low sulfur fuel does create a carbon buildup in the furnace, BUT these engines do not do well with additives! You can void the warranty on the engine with an additive! Check with the company or engine manufacturer before you add anything to the fuel.

You can "fool" the APU into running more often by having something pulling power that pulls the battery down and getting the APU to kick on and recharge the batteries thus stirring the fuel and heating it up a little. You can also do what I did and get some of that water line wrap and insulate the fuel lines.

It got kind of funny in NYC in the winter time with my new truck! When the heater would kick on the Espar would smoke like crazy! This was due to the carbon buildup from the low sulfur fuel. It looked like the truck was on fire from all the smoke untill the Espar heated up.

I had the FDNY called several times from people seeing it start up and made the 911 call! I became friends with several FDNY companies! We got it figured out that if a 911 call came in from any of my 3 favorite overnight parking spots not to roll on it when they were told it was a truck that matched my trucks description. But it's nice to know that you now have some good friends in NYC! From the fire department to the police! It also helped that when I had a small amount of OS&D in frozen foods I would donate them to these guys.

 

Better yet , saw 1 in the Port of NJ a few years ago , guy was saying he never used it and was thinking of selling it . A new O/O in the line was interested , they opened the cover and there WAS nothing there.