checked the pump. Pump is running fine.

You are right. Stock FPR is more than adequate. But my stock FPR became faulty. Not rising enough fuel pressure on boost causing it to lean out and knock which then caused the ECU to pull timing. Which is why I originally bought the SARD FPR. However, the SARD is now doing the same thing, but even worse.

I got my hands on another OEM FPR which I am going to try today. But after already purchasing the SARD FPR to replace my original faulty FPR, I may as well put it or the warranty replacement SARD FPR to good use once I confirm whether or not it is faulty.

WHS ^^

Possible fake Walbro? Google it.....

static pressure o.k. but poor flow?

Check the voltage at the pump when running, voltage drop will cause slow priming.

Is there one on the manifold to try?

[QUOTE=Mister Two;381528]checked the pump. Pump is running fine.



You are right. Stock FPR is more than adequate. But my stock FPR became faulty. Not rising enough fuel pressure on boost causing it to lean out and knock which then caused the ECU to pull timing. Which is why I originally bought the SARD FPR. However, the SARD is now doing the same thing, but even worse.
[/QUOTE]

This is pointing to a pump flow issue bud....... 2 x rooted FPR's? not likely.

Static pressure maybe fine as there is minimal volume being pumped static, but once the injectors starts using lots of fuel the pump can't keep up.

Have you tried running it under load with the return clamped to see if the fuel pressure drops away as injector duty cycle increases?

hmm I think i have or at least had a similar issue
mine got alot better after mounting the sard differently, but because i havent been running anything over 14pound for ages i dont know if it's fixed itself..

where'd you buy your walbro?

I got my Walbro off a rexnet vendor.

I am able to manually adjust the fuel pressure on the SARD to whatever level I want. If I set the base pressure to 50psi then the fuel pressure will ensure I dont knock on boost. but it will be quite rich everywhere else.

Getting base pressure is not a problem. Its the rising rate component of the FPR that seems to have problems.

got a leak in your vacuum line to FPR?

Its a new vacuum line. I checked it for nicks or cuts and it seems clean. When I take the vacuum line off I can feel the suction of the engine.

If you set it to 50 psi with the vacuum line off will it hold 50 psi with the engine under load/ on boost?

Just clarifying.......

yes, it will hold 50psi and under boost will rise fuel pressure, but only rise by 4psi when it should be rising by 16psi.