What code number is the EVAP code?
Not enough fuel is getting to the engine creating the lean and miss codes.
A restricted or blocked evaporative emission (EVAP) vent path is detected by the control module monitoring the fuel tank pressure (FTP) during normal operation. The control module commands the EVAP vent valve OFF, or open, and the EVAP canister purge valve ON, or open. The fuel tank pressure should remain low as vacuum is drawn on the EVAP system. If the vent path is blocked or restricted, the vacuum level will increase and DTC P0446 will set.
There may be a damaged EVAP vent housing, a blockage at the EVAP vent valve inlet, or a pinched vent hose.
IF this condition started right after the pump installation I would be looking for a pinched vent hose.
*A blockage in the vent system will also cause a poor fuel fill problem
Was the fuel filter replaced? If not do it ASAP.
Thursday, January 28th, 2010 AT 7:52 PM