Thread: Deleting fuel cooler.

Originally Posted by shack

I wouldn't overthink all this stuff guys.


The LR technical info says the fuel cooler is for "optimum performance and emissions"

The fuel is kept within a certain temp range as it enters the head/injectors.

The difference pointed out above as regards timing being affected is true, but the difference is negligible..I wouldn't worry about it.

The TD5 engine management has maps that makes allowance for different temperature fuel and adjusts pulse width to ensure the correct MASS of fuel is injected.

Personally I'd keep the cooler, it'll stop the fuel in the tank getting extremely hot when in hot weather with low fuel in the tank, it'll also lift the temp of the fuel entering the head when it's cold, I'd also view that as a win.

As a side note, I'd definitely be making sure the fuel temp sender is working otherwise you'll get poor performance results.

I've purposely run the tank down to almost fumes (probably 5l left in the tank) just to see how hot the fuel gets without the cooler.
Didn't see any real difference, maybe 5 degree hotter. Not sure if it's a myth the 'not running tank too low' ?
but this was in cold weather.


What you said about lifting the fuel temp when cold makes sense, I could imagine a pretty big temp gradient between injector #5 and #1 as the fuel is heated by the head as it flows through. Feeding with pre heated fuel stops this.

Originally Posted by laney

Yes a picture would be fantastic.

X2

I think the fuel lines need to be shortened as well - for optimum neatness.

Am away from the D2 till the 11th so will upload some pics when I return!

Originally Posted by sierrafery

search for PIB000080,
...
a T piece is needed instead of the old cooler's coolant outlet, i have such a cooler prepared for when my original fails

Originally Posted by sierrafery

... hence the cooler's thermostat(which the newer square type coolers dont even have):

Fuel cooler
...
The 'T' connection houses a thermostat which opens at approximately 82°C. This prevents the cooler operating in
cold climates.
...

Any idea why the new square design fuel cooler doesn't have a built in thermostat like the old cylinder units do in the t-peice?

What is the change in plumbing at the factory with the newer square design cooler? Does LR use a t-peice or is there other changes to make that redundant?