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Originally Posted by BigJimZ28 the gas keeps the fuel pump cool the more gas the longer the pump will last |
That's presuming that the fuel pump is damaged by temperatures below the boiling point of gasoline. If the pump is immersed, it can't get hotter (other than local hot spots) than the boiling point of the coolant (which will be somewhat increased by positive tank pressure, if that exists). I presume you think the bulk temperature of the fuel in the tank will be increased by traveling thru the fuel rail in the hot manifold area and back to the tank (plus frictional heating from the pumping), but the ambient is quite a bit lower than fuel rail temp...my gut feel is the fuel in the tank isn't going to get heated much in the final analysis...heck, the tanks are plastic today (which of course reduces the radiation and skin convection due to the lower thermal conductivity of plastic vs. metal, which means the fuel could be hotter today than way back when).