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Message: [QUOTE="Strictly Diesel, post: 447571, member: 1411"] I don't entirely agree with Charles on the temperature data. We did a BUNCH of testing on fuel temps and coolers years ago and found that fuel tank temp, fuel temp at the filter bowl and return fuel temp (at the regulator) were more closely related to overall underhood temp than anything else. The fuel in the tank did not show a significant increase in temperature over longer driving time and as the fuel level went down as some people speculated. The fuel returning to the tank actually lost quite a bit of heat just running along the stock frame mounted steel fuel lines. A return cooler did make a difference, but it wasn't huge and made no difference in how the truck performed or what economy the truck got. I've attached some images showing the digital gauges we used for testing...notice that the fuel in the tank was 84°F and the fuel in the stock filter bowl was 124°F...that's a lot of heat gain for fuel that has not yet reached the cylinder heads. Engine oil temp was always hotter than coolant temp, and the filter bowl in is bolted directly to the high pressure oil reservoir (7.3L test truck)...so that's where a lot of the heat came from. [/QUOTE]

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