plug a secondary EFI syt. parallele to CSI

[Denis]

Hi.
I pluged a Bosch regulator from a BMW to supply one extra injector. This inj is commanded by a little circuit i did.

I plugged one big hose side to supply, the opposite one to the fuel rail , then the little on the buttom to the vac line, then the opposite pluged to the return line.

But went i plug the return line it affect the CIS injectors pressure.....

So how can i plug a EFI system in parallele with the CIS. It s my dayli car so i cant remove the CSI right now.


Ðenis