Fuel heater relay question

[sheatay]

Hello, this is my first post! I'm a new 80 series owner, picked up my HDJ81 about 2 months ago. Trying to go thru everything and fix any issues before I go on longer voyages. One of my issues is with my fuel heater. I have the OEM fuel heater module on my fuel filter housing, and the wires from it go into the OEM harness. On my fuse panel, I have the "FUEL HTR" relay spot, and a fuse slot, with a good 20A fuse. The issue is, the fuel heater relay spot is empty, and the slot doesn't even have any pins on the inside, its just empty! Am I missing something? Would be odd for the system to have everything in place except the relay. Pretty sure my rig has the cold weather package as well, it has heated seats. Any help is appreciated!

As you can see, No relay, and no pins! (white slot top right).

 

[HDJ80L]

I wondered the same after seeing the empty relay socket. The answer is the diesel fuel heater circuit doesn't use a relay, it is directly powered through the 20A fuse and turns itself on and off through an internal switch. Now why is there an unused relay socket... maybe it is used in a different spec/model, maybe they added it to the design initially but later ditched the relay.

 

[Marvelicious]

Related: Lutz Auto sells a kit with the correct contacts and 20A relays to plug into those locations if you wanted to use any of those unused sockets for anything. Convenient if one is adding some fog lights, or the AUX fan or anything. No affiliation, I just ordered one myself, so it was on my mind.

 

[LongDuck]

I can't be the only guy who showed up here thinking I somehow need a Fuel heater on my GASOLINE 1FZ-FE, and neglected to educate myself on this often overlooked 80 feature, right?

 

[sheatay]

I wondered the same after seeing the empty relay socket. The answer is the diesel fuel heater circuit doesn't use a relay, it is directly powered through the 20A fuse and turns itself on and off through an internal switch. Now why is there an unused relay socket... maybe it is used in a different spec/model, maybe they added it to the design initially but later ditched the relay.

Wow thanks for that. So mine should automatically kick in when the temps drop! It is confusing that the fuse panel cover says there should be relays in there that are not present haha.

 

[sheatay]

I can't be the only guy who showed up here thinking I somehow need a Fuel heater on my GASOLINE 1FZ-FE, and neglected to educate myself on this often overlooked 80 feature, right?

Hey man 1HD fuel filter housing swap? Anything is possible lol! It is a cool feature, I'm glad I have it. I'm in the PNW, and when offroading in winter, especially overnight, temps could potentially drop low enough to gel the regular diesel. Good peace of mind, the fuel heater plus diesel additives should keep it running smoothly!

 

[LongDuck]

I live in the middle of the Sonoran Desert. It was 118F here yesterday...