Thread: Hot Long Range Fuel Tanks

the hotter the fuel, the less dense it is and efficiency suffers.

When I was a kid in short pants (talking circa 1979) Dad built some electronic fuel coolers using peltier modules, installed them in cars and put them on the dyno at I think Uni of NSW and the results were startling. Lower CO and I think NOx emissions, better fuel economy and a slight increase in power.

I suppose I should rather transfere the fuel aft than actually selecting the fwd tanks to the fuel suction. I will try setting up my electric pump as a transfere to the rear.
Will have to make a drawing least I confuse myself and end up taking a swig of fuel instead of water.
Thanks
James

Transferring fuel aft may be a good idea, but the effect of changes in temperature would be pretty small - although this depends on whether we are talking about petrol or diesel. Loss due to evaporation of petrol will increase quite rapidly at 45C - venting the front tanks into the rear one rather than the atmosphere could help - although it will have little effect on diesel.

But I would review the venting arrangements and make sure that expansion due to the increase in temperature is not simply causing fuel to be lost.

John

A side affect of the heat is should water will not build up in a cold damp climate.

In BMW motorcycles with low slung cylinders heat does not build up in the bottom of the fuel tank like it does in bikes with upright cylinders and they are more prone to contaminated fuel.

In TD5 and similar engines the fuel recirculates and heat would build up as well, many EFI petrol engines do this, and aerate the fuel as well.

Jeff