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Car runs great during hot laps, heat race but during feature the fuel pressure starts to swinging causing engine to do the same. It started this 2 weeks ago, checked pill,filter(ss one) and blew lines out last week, then it did it again last night. Came in, did those same things again but no luck, changed pill from a 200 to a 180(on gas) and pressure was back, took it out after races and it ran fine except fuel pressure was swinging 5-9. Thinking fuel line might be a problem. What pill are yall running with this pump on gas or have yall gone to a reg on the return to stop this. Its been doing great with the 200 until now. Any suggestions and sorry for the long explanation. Thanks