As long as the ecu has a map sensor it wouldn't really matter if it was connected or not as long as it was the same setup as was when the ecu was mapped. The vacuum connection changes the fuel pressure according the the inlet manifold pressure.

Jim


--------------------------------------------------
From: "xtreme brian" <[email protected]>
Sent: Monday, April 18, 2011 11:11 AM
To: "Quantum Owners Group" <[email protected]>
Subject: [Quantum Owners] xtreme zetec

Hi All,Ihave read somewhere that when running an injected zetec on an
omex ecu you leave the vaccum inlet on the fuel regulator open to
atmosphere.Can anybody shed any light why this is as mine is
connected?.  Regards Brian.

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