My '87 300D has an intermittant air leak that seems to be coming from the Fuel thermostat, or possibly the hidden place where the fuel hoses come and go after that (dissappears near the back of the valve cover) which I assume is where it gets heated(?).

What would happen if I just ran my supply line straight to the lift pump, and bypass that whole fuel heating mess?

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1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine

i bet that 75% of the diesels i get to work on has the fuel heater bypassed, dosent seem to bother the running ability. where i get confused is why some one wouldnt just replace the o ring and keep the heater in service.
larry perkins lou ky

Thanks - I think I'll just bypass it for now so I can drive it while rebuilding the thermostat/heater.

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1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine

Its fine to bypass it. It only works below 65*f.