Peugeot 406 hdi keeps stopping will start again but only runs for short while had same problem before fitting new high pressure pump Car drove fine for 350mls then started it again.?

The issue with your Peugeot 406 HDi could be related to several factors despite the new high-pressure pump. It may be experiencing fuel delivery problems due to a clogged fuel filter, air in the fuel lines, or issues with the injectors. Additionally, check for any fault codes that may indicate sensor or electrical issues, such as with the crankshaft or camshaft position sensors. It's advisable to perform a thorough diagnostic to pinpoint the root cause.