Run engine with return to header tank off and make sure you have a good flow to tank,if not you have flow/circulation problem or stat is playing up.
Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.