fuel pressure dropping @ wot

[8AV8]

I just installed a ta 60,42.5lb inj,THDP 3",with a postons chip to run them.The guy I got the car from had a ext fuel pump under the car but I think it may be insufficient. My fuel pressure will rise at half throttle and then suddenly drop when I get close to WOT. whats causing this, anyone know?

 

[Red Regal T]

Information given sounds like you need a new fuel pump.

 

[Under Pressure]

change your fuel filter and lose the inline put a walbro 340 intank