Boost and fuel pressure

[btoscano]

Hello,

I have a problem with poor top end. I have a boost gauge and a fuel pressure gauge.

The fuel pressure gague does not suck down, but I did notice some small variations. It will idle at 6-7 psi. If I revv the motor, it will dip 0.5 psi or so and then increase a little. If I disconnect the fuel line at the injection pump and wait a few minutes and reconnect it will idle at almost 8 psi. If I revv the motor, it will not dip at all and increase to about 9.5 psi. I wonder if some air is getting trapped in the system?

As far as max boost... if I'm travelling down the road at 65 at 5 psi and floor the accelerator, it will move up to 12 psi (it doesn't get there immediately, it takes about 2 seconds) and fuel pressure doesn't decrease. However, if I am going downhill in 4th, and floor it, it will get up to 15 psi and briefly dip the fuel psi gauge to 4 psi as it does it.

This does not seem right. It seems I should be able to get 15 psi if I floor it uphill. I think if it did, I wouldn't be having any problems.

What do you all think may be the problem?

Brian