I have a leaking fuel thermostat on an 87 300d OM603.
Instead of fixing it, I have temporarily bypassed the thermostat. Runs fine, no issues.
So I had an idea to reroute the fuel lines so that the fuel is always running through the heat exchange circuit. Full time winter and summer.
My thinking is that warmer diesel fuel will be more efficient with more power year round. (theoretically)
Or is there a sweet spot for fuel temperature?
Am I thinking wrong? What say ye?