HPA High Pressure Fuel Pump

HPA HPFP Slow Start

Following the installation of the HPA high pressure fuel pump (HPFP) the GTI became slower to start with the engine turning over longer before catching.

A data log of the fuel rail pressure versus set point during a third gear pull at 26 psi of boost was also recorded:

HPA HPFP Troubleshooting
HPA HPFP Troubleshooting

The fuel rail pressure well below the set point was another indication that something was not right.

HPA had me return the fuel pump and about a week later after being serviced it was returned.

At this point the HPFP checked out good.