[skyking]

Originally Posted by oil pan 4

Cummins marine advises against heating fuel beyond 125°F and actually recommends keeping the fuel close to 75°F to prolong injector pump life and the best fuel economy.
You don't need to heat the fuel since the injectors are screwed into the cylinder head. So by the time the fuel is injected it's already at cylinder head temperature.

I have an artic fox fuel heater to install. I'm going to limit it's temperature to around 100°F.

75F is probably a lot easier on my CP3 high pressure pump too. That 5 F stuff has to be hard on a 18,000 PSI pump.

I have a tentative plan for tapping into my heater core coolant hoses, and making a heat exchanger that has about a pint of volume. Get it as close as I can to the engine mounted filter/water separator.
I don't know if my OBDII give me fuel temps or does anything with them, But it seems that 75 F fuel could never hurt, and may help.