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chris164935

Fuel Pump Relay Setup

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So, the car is a 2001 Audi A4 1.8T (same motor as Audi TT 1.8T).  I am running the Vi-PEC i88 ECU.  I have 3 fuel pumps installed on the car (1 in the fuel tank, and 2 mounted in a surge tank).  I have the 1 pump in the fuel tank powered by its own relay and the 2 pumps in the surge tank powered by a second relay (1 relay for the 2 pumps).  I wired the Aux Output for the pump in the fuel tank to Aux 1 and the Aux Output for the pumps in the surge tank to Aux 2.  In PCLink, I set Aux 1 and Aux 2 to Fuel Pump Relay, however, only Aux 2 is priming and running when I try to crank the motor.  I have tested Aux 1 by setting it to Test and everything works fine then.  Is the issue that I am not supposed to have more than 1 Aux Output set to Fuel Pump Relay?  If so, then what can I set Aux 1 (or 2) to so that the pumps will prime and then run once the car reaches a certain RPM?  I would prefer to not have to do any re-wiring if possible.  I have attached my *.pcl file for review.  I am not on the newest firmware version that came out on May 16th.  Not sure if that will make a difference or not though.

B5 A4.pclr

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Hi Chris,

Yeah the problem is that you are only allowed one aux output allocated as fuel pump. Probably the easiest solution (no wiring changes required) is to keep Aux 1 as fuel pump, and then set Aux 2 up as a GP Output that is activated by Aux 1. This is how the setup of Aux 2 will need to be:

Aux 2 - GP Output.PNG

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