How does fuel pressure affect performance?

[TomoHawk]

I'm (only?) getting about 35-37 PSI of fuel pressure at the fuel rail on my 280Z, and I'm wondering if that's an answer to the low power problem I seem to be experiencing (slow acceleration from a stop). There seems to be some power at highway speeds- enough to get 60 to 85 MPH within a reasonable distance for passing, but acceleration & merging with highway traffic is kinda slow.

I put a can of SeaFoam through the engine, so I would assume it 'breathes' better than before, but still no improvement in power. The injectors were also serviced (and were pretty much matched for flow) about a year ago.

So right now I'm looking for reasons that would explain low fuel pressure on the fuel rail, like blocked strainer on the fuel pump ( can you buy new ones?) or low voltage to the fuel pump, or even the 6mm hard lines.

thx

[Virto]

The norm at idle is ~36 PSI, so it sounds like you're pretty much on target.

Have you checked the plugs for fouling, or the dizzy for any cracks or other wear?

Make sure the air cleaner is also firmly attached to the AFM, and that all electrical connections are secure.

I suppose you could have a gunked up filter or pickup in the tank, but your pressure seems ok, so we should check all the basics first.

[TomoHawk]

Thx Virto

I had the dizzy out last winter, to clean & rebuild. I did everything but a new pickup & vacuum pot (NLA). The cap is new also. Spark timing night need a little adjustment. As for electrical connections....

The tech that checked out my car after I got it out pulled ALL the injector connectors off (they had to be attached using RTV stuff. I think I could pull them again, and tighten the connectors a little. Injector-side pins were clean & shiney when I last looked.

I've been checking all the connections as I seem to be hearing a vacuum hiss, but can't tell from where. I've checked, serviced, or replaced many things, except the hose on the underside of the intake manifold to the block.

thx