Start problem developing...

[fred98050]

1980, 300TD.

First start of the day is becoming harder than usual. Outside temp still in the 40s. I cycle the glow plugs twice before starting, the engine starts ok, runs for few seconds then quits. Try 2 or 3 times and it starts and runs ok. I suspected defective plugs, but when the car eventually runs It does not smoke at all which makes me believe that it might be fuel related (or both).

Otherwise during the day the car start and runs well.

- Converted to new pencil type/ parallel plugs 7 months ago.
- Looked for fuel leaks but can't find any.
- Fuel filters ok.

Any suggestions?

Thank you