[scarceller]

Priming the fuel pressure actually is important for cold start. At initial startup the DME sends a cold start injection pulse width that's carefully calibrated based on ambient temps. This is a pre startup shot of fuel and typically lasts about 2milliseconds. But for this to work correctly the DME assumes fuel pressure is ample at the fuel rails. This is also why most modern day OEM fuel injection also has a fuel pump prime prior to startup.

All my DME offerings have this feature, my chips via software turn the pump on for 3 seconds even with the stock relay. I found that it really helps cold start especially on very cold days, motor catches faster.

The relay offered here does have value in this feature and it seems like a decent alternative to getting the fuel pressure primed in an all stock DME.