Ever heard of fuel flowing back into the fuel tank when the car has sat overnight? This was suggested to me as the cause for my difficulty starting the car after it has sat for several hours up to overnight.
New battery, new glow plugs, new fuel filters, diesel kleen and lucas added to last tank of fuel, fresh oil in oil bath, no clog in air intake.....
But everytime the car has sat overnight or for more than 3 hours it takes about 3-4 tries and about 30-45 seconds pulling the start knob.
If it is fuel flowing back into the tank, what would cause this to happen and how do I fix it?

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Anthony
'76 W115 240D
'67 IH Scout 800
'61 IH Scout 80