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The o-rings in the drain valve are factory Buna-N (coated in yellow PTFE that is quickly removed with ULSD) and are quite susceptible to compression set. With age they will flatten out against the fuel bowl and when cold, they can seep quite a bit. Warmer weather or heat from the fuel bowl heater can get them to seal temporarily.
The other two common areas is the fuel sleeve that connects the passenger's side fuel line to the rear of the head. It gets cooked by the turbo down pipe. The other one is where the passenger's side fuel line passes through a "P" clamp by the turbo pedestal. Movement here will actually rub a hole in the fuel line but in both of these cases, the fuel leak will not stop for any reason.
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02 F350 EC LB 7.3 PSD SRW Lariat 4x4
BTS valve body - AIS Intake - 4" MBRP - SS HPX
Lift pump - Dahl pre-pump filter - WW
DPTuner chip - Z-series Gauge - TC Lock
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