So Ive just put a 300 tdi back in my truck after being sat in the workshop covered over for 9 months, ran perfectly well last time. Left the old oil and filter in so it wasn't dry. Now the warning light wont go out, have tried an oil pressure gauge via a t piece that registers 0. Any thoughts ?
No oil pressure
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Bypass/relief valve stuck or broken?
Flossie
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Pump drive shaft broke, splines gone ?
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If all the oil has leaked out of the pump, do they self prime? How long does it take?
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Don't put any oil in the warning light! Bulbs only 
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This isn't going to help, but my 300Tdi stood for over two years on the drive before being dropped back in. Started up no bother and with no oil pressure issues. It was stood upright on supports along each side of the sump.
Colthebrummie
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Get a new oil pressure switch thingy
Col
Col
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I wonder of you had flattened the sump up against the oil strainer and so blocked the flow of oil?
When you say all good, does that mean the pressure is back?
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That's good pressure. Presume you didn't run it long with no pressure
