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Bypass the fuel thermostat (go straight from the tank to the lift pump) and be done with it. Unless you live in Siberia, it isn't really doing much anyway. Plumbing the fuel through the heat exchanger full time is detrimental to your injection pump. Not only does hot fuel have less power density (it expands), but hot fuel also has less lubricity so you're tearing up your lift and injection pumps.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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