High Fuel Pressure---Help!!

[Topless]

Try a different fuel pressure gauge. A Boxster normally varies between 3-4bar (40-60psi). It is more likely that your gauge is reading incorrectly than you have blown out 2 fuel pressure regulators.

As to your other symptoms:
Any CEL error codes?
Model, year, mileage?
Any recent repairs or mods done?

[coolbreeze551]

Originally Posted by Topless

Try a different fuel pressure gauge. A Boxster normally varies between 3-4bar (40-60psi). It is more likely that your gauge is reading incorrectly than you have blown out 2 fuel pressure regulators.

As to your other symptoms:
Any CEL error codes?
Model, year, mileage?
Any recent repairs or mods done?

I will try a new gauge sensor and go from there. It is a 2001 base with 155k km's. I have recently added the sensor itself along with idle control valve (used), 74 mm TB with IPD plenum.

[Topless]

Originally Posted by coolbreeze551

I will try a new gauge sensor and go from there. It is a 2001 base with 155k km's. I have recently added the sensor itself along with idle control valve (used), 74 mm TB with IPD plenum.

A small intake air leak as a result of your recent TB/Plenum work would explain the idle stumble at high vacuum. Retrace your steps.

[coolbreeze551]

Could an air leak cause the fuel pressure to fluctuate like this?

[Topless]

Originally Posted by coolbreeze551

Could an air leak cause the fuel pressure to fluctuate like this?

Fuel pressure fluctuates whenever you go from idle to full throttle. It is unrelated to an intake air leak. You already changed out your fuel regulator so at this point I believe you have eliminated that as a failure point.

[BYprodriver]

Originally Posted by Topless

Fuel pressure fluctuates whenever you go from idle to full throttle. It is unrelated to an intake air leak. You already changed out your fuel regulator so at this point I believe you have eliminated that as a failure point.

Is it a oem fuel pressure regulator or aftermarket?

[coolbreeze551]

Originally Posted by BYprodriver

Is it a oem fuel pressure regulator or aftermarket?

It is oem purchased from pelican part number 993-110-199-01-M14