There has been a bit of forum talk recently of a few different HPFP solutions for the N54 cars so I thought I would give a brief intro into a new possibility –
The dual piston style pumps you see here are on my Z4 . So far, development has gone well. The car is driveable but still a ways to go to make it fully operational.
May never get this to work well enough – or it may turn out great! Hopefully by spring time I will be able to run full E85 without running out of fuel pressure