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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.The Pump Electronic Module controls current flow to the fuel pump to regulate pressure. The Engine Control Module pulses a reference voltage from the PEM to ground with a varying duty cycle. Can you install a fuel pressure gauge and monitor the fuel pressure while the problem is occurring, the pressure at idle should be right at - 43-45 PSI, under light load it should jump to 55 PSI and up to about 60 PSI under heavy load and should hold once the key is turned off. Check this for me and post back with the results and we can work from there to determine the cause.
You going to want to run the pressure test while the problem is occurring if at all possible.
No problem, Im here as long as you need me.
I would have to agree that you may very well be kinking the line, that may explain the drop in pressure when your turning. It dose seem like the problem is in that tank .
While the pressure is fluctuating have you checked your voltage at the pump to make sure its holding steady?