do injectors have an effect on fuel psi?

[mr.prick]

specifically injector pulse width,
it seems my psi is inching upward and,
i have been changing the IBPW {B3701} as to try and avoid
making changes to other tables that i have set. (IFR, VE, MAF)
now i am wondering if the IBPW is raising it more
than it seemed to already being increasing or if i`m chasing my tail.

[Bruce Melton]

Never seen a change even with drastic IFR adjustments. Usually run a mechanical fuel pressure gauge on the dyno. I would think if there were a fall off it would be @ higher fuel volume, with min pulse width being insignificant.

[mr.prick]

i am averaging 75psi and have hit 80 psi max.
is that something to worry about?

[Bruce Melton]

All the OSs and tunes done here assume 58-60 psi fuel rail pressure (I believe) so if you are exceeding that your IFR settings and all fueling calculations are skewed. Are you using a stock style pump?

[hquick]

I see fuel pressures of around 75 or so whilst accelerating. Also, sometimes my fuel pressure guage jumps around all over the place...even hitting '0' for a second here and there....but no stumbles or what not???
Quite often as I back off the pedal the fuel pressure will drop a fair way before steadying back to 60.

[Bruce Melton]

Any air in the line before sender or gauge will dampen the response. I bleed out the line at the gauge when using my temporary mechanical gauge.
Amazing how well the fuel pump system maintains pressure given the rate of volume change.

[hquick]

I have a sender permanently mounted on the schrader valve on the rails.
Wonder if I have air in there?
It's been there for a long time.

[TAQuickness]

I have a consistent FP drop at WOT (61 psi to 53 psi). Seems this is the result of the physical location of the regulator (by the tank as opposed to the rail). On occasion I have seen spikes in the FP when I let off the throttle quickly, but nothing over 68 psi.

[mr.prick]

yeah,
i have had this high FP mystery for awhile and
now it seems to be getting higher with out reason.
i just have a walbro, no hotwire kit or anything special.

[hquick]

I used to see the same rises with the Whipple BAP setup but now that is no longer installed.
I recently installed the Walbro...but I used to see the same thing with the OEM pump.
I wonder if the fuel pump voltage offsets have anything to do with it?