is there ever a time when any of your cars are stable and dont need something done?
To be fair, I've been working up to this on the red Z for some time. Replacing the fuel pump was the last issue that needed overcoming, since the original fuel system was so complicated, poorly designed, and (most importantly) incompatible with ethanol-based fuels.
The original fuel system had an FPR that was too small, which was compensated for with a multi-speed fuel pump, which resulted in requiring another FPR on the other side of the fuel rail (the incoming side), and a fuel gallery that ran over the top of the plenum (which in itself necessitated a separate solenoid valve to relieve overpressure on the heat-soaked gallery).
Now the fuel system is simple - it goes from the pump (which is now happy to run at full speed all the time) to the filter to the rails to the FPR to the ethanol content analyzer to the tank.
I've eliminated more than half the parts and junctions in the original system and changed the ones that were there to threaded AN fittings, which is a net win in my estimation.
This is sort of the capstone of that series of modifications, and it's been in the works ever since I decided to dump the stock EFI computer for one that's from this century.
Also, I don't "need" this done. I want it done. It runs just fine right now on regular gas without futzing at all. I'm just upgrading to a "flex fuel" setup.
The reason why it's taken so long is because I'm a pedantic fucker and like to change one thing at a time and work out the bugs as I go along instead of changing a bunch of shit at once and then ending up with a boatload of issues.