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Old 08-06-2009, 10:47 AM
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Fuel Thermostat, How Does It Work?

How does the fuel thermostat work and does anyone have a cut away picture of it?

I know that it routes fuel in a loop up to the head somewhere but that seems like it would get too hot. It seems like the coolant would have been a better source of heat.



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Last edited by Oldwolf; 08-06-2009 at 01:28 PM.
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Old 08-06-2009, 11:46 AM
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AFAIK, the thermostat opens in cold weather and allows the fuel to pass through a section of the engine where there's coolant. Clearly this does no good on a stone cold engine (unless you have a block heater) but once the engine warms up the fuel will be warmed as it passes through the coolant. Warm fuel works better in the fuel injection system.
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Old 08-06-2009, 12:14 PM
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Is it hooked up to the engine oil recirculation by any chance? I have not investigated it yet but I see a lot of engine oil near the fuel thermostat or beneath it. I just put a rag under it to mop it all up until I have the time to investigate/work on it. Where else in that area can leak engine oil?

It seems to happen to all my to be fixed up 300SDL.

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