Originally Posted by ldillow (Post 4043734)

it's my understanding that fuel coolers were introduced because of the "closed loop" fuel return system to the filter or regulator and not returning to tank, or having no return. By looping the fuel it would return warmed fuel and then loop it again, causing gradual increase temp on fuel. I would assume varying fuel temp can alter the dynamics on afr. returning fuel to tank, or always having a fresh supply such as a carb setup wouldn't need a fuel cooloing system. I am sure there is a brainiac on the forum that can tell us the optimum fuel temp. Too cold, I would assume impacts fuel atomization, too hot probably
causes something as well. but then, i am guessing!
larry

Originally Posted by Black Baja (Post 4043632)

Will the cooler actually cool the fuel? Or will it heat it? The fuel bowls on my carb tend to get a little frosty after some hard running. I know of a boat that has triple 525/whipples and they actually used a heated fuel line on it cause the lines were freezing up.

Originally Posted by ldillow (Post 4043734)

it's my understanding that fuel coolers were introduced because of the "closed loop" fuel return system to the filter or regulator and not returning to tank, or having no return. By looping the fuel it would return warmed fuel and then loop it again, causing gradual increase temp on fuel. I would assume varying fuel temp can alter the dynamics on afr. returning fuel to tank, or always having a fresh supply such as a carb setup wouldn't need a fuel cooloing system. I am sure there is a brainiac on the forum that can tell us the optimum fuel temp. Too cold, I would assume impacts fuel atomization, too hot probably causes something as well. but then, i am guessing!
larry

Originally Posted by mike tkach (Post 4043952)

fuel lines freezing up in a boat,id have to see it to believe it,unless it is being run in northern alaska.