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Thanks for everyone's help. Problem fixed, it turned out to be a faulty fitting that was not sealing on the suction side, so under WOT it was sucking air. Now have a constant 6psi.

Thanks all. Yes this system has no return line and is vented via the fuel cap. I've removed the cap and still have the same issue. I to believe it's the suction side, the flexible line is new, E85 compatible and as too all the other lines. I have checked to see if any line has delaminated and...

Hi All Need some help with fluctuating fuel pressure. This is a all new dead head system and is in a Duster with new sender with 1/2 inch pick up, 1/2 to Holley 12-125gph pump, 1/2 to Holley 12-845 Billet reg and 1/2 to E85 Quick Fuel Q850. Have great pressure from idle to about 3500rpm (6psi)...

This is dash 8 form pump to y block then dash 6 to carbs, it may give you an idea.

Clear as MUD

So thats Yes I don't need a return line? This is the kit from Summit. http://www.summitracing.com/parts/HLY-12-802-1/ Looks like I want need one with this set up. Cheers

I'm up grading the fuel system from a standard fuel line Carter facet pump & Carter mech to a STR-12 to 1/2 line, Holley Blue pump & reg. I see there is a return line, by the way I'm looking if I'm running a fuel reg I want need the return line is that correct? Cheers