- Thu Jul 22, 2021 10:04 pm
#51982
I'm 100% sure the pump is shutting off, but agree that it's definitely not right for it to keep limping along (see my reply to neovin). The injectors are also a bit oversized compared to stock Miata, so if they are getting stuck open, I think there would be a wider-than-normal aperture. Maybe I've just accidentally replicated a semi-functional gravity-fed setup, like an old model T...
Chris Wolfson wrote: ↑Sun Jul 18, 2021 8:27 am Your fuel pump does not shut off if you think it does. There is no way for an electric injector valve to run on the engines vacuum. For that you need a carburetor...
The usual fuel pressure range is 2-3.5 bar, with the regulator port open to atmosphere. Set it once, then do not change it any more, as the whole fuel tune depends on it. When the engine is running, this port has to be connected to manifold pressure, so the differential pressure is kept constant, independent of trottle position/ engine load.
I prefer the fuel pressure to be on the high side, as fuel atomization is a little better, but you have to have an eye on injector opening times at idle, so you do not get too rich.