Spood

I just finished my d16z6 swap intop my 94 Cx. I'm getting a Code 43: "Fuel Supply System defective or malfunctioning fuel supply system." The CEL does not come on all the time and goes away if I turn the car off and back on. I'm going to replace the fuel filter tonight or tomorrow and see if that helps. I know the injectors and fuel pump are good. The only other thing I was able to come up with is a little breather-dealie on the end of the fuel rail that is was not present on the d15b8 (we swapped the hose and fitting over). Any other ideas? Thanks!