Inside of failed Fuel Coolers off of a 450C.

Cummins 330B, 370B & 450C owners, If you ever wondered what the insides of your Diesel Fuel Coolers would look like if the fuel flow through them was blocked, here it is. Our 450C's had their return fuel hoses, (4) of them incorrectly connected from the factory. When we switched the flow of the return Diesel fuel we prevented the blocked the return flow of Diesel fuel back to tank. Above is the result, along with Diesel fuel inside the boat. You should be able to see through the cooler from one end to the other. In essence like looking through a paper tower roll. Engine cooling water should be flowing through the center of these and in so cooling the Diesel fuel before returning it to the fuel tank. J Clausen 5/00

All used up Zincs on a Cummins engine.

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The actual Fuel Cooler on a 450C is in the center of this photo.