I have recently been working on a project at home and have put a Red Top Turbo into my Mk4 astra.
Im not 100% sure what model engine it was but it did not have a fuel return pipe on it.
After reading both haynes manuals for the Mk4 and the cavalier thoroughly as well as trying to ask people. I believe that the proplem is due to the fuel regulator being in the fuel pump.( Hence no fuel return pipe)
If this is correct then would a change of pump be required and which pump?
Any help would be much appreciated!!