Series diesel lift pump draw the connection, or pipe, between the tank and the lift pump can suck air into the system. This can cause misfire while the engine is running. When the engine is stopped, fuel can drain the out of these leaks, to be replaced by air when the engine is cranked over, preventing if firing. The only way to get the engine running is by bleeding the system. Parking on the slight slope with the front facing downhill will prevent air getting in through slight leaks until you can sort the pipe work.
On vehicle with the plastic fuel tank and immersed lift pump, such as Discovery Tdi, the pipe work immediately above the fuel tank can rust and perforate, allowing air into the system. Clean the metal pipes and protect them with grease.
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