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**asshanson** · 05-07-2012

I think the stock feed line should be ok for that level. I wouldn't mess with the return until you get the fuel system working, then see how low you can get for base pressure. If you can low 40s with the walbro 450, then no need for a bigger return.

Is the new walbro 450 the same physical size as the walbro 400? Do you have flow rate comparisons between the two? Or is it just 50 more lph than the 400? If so I may be tempted to purchase one myself, it's a direct replacement for my OEM pump (same dimensions).

05-07-2012	#1
asshanson immune from paybans Join Date: Oct 2005 Location: West Des Moines Drives: poorly Posts: 4,358	Re: Project V8killa I think the stock feed line should be ok for that level. I wouldn't mess with the return until you get the fuel system working, then see how low you can get for base pressure. If you can low 40s with the walbro 450, then no need for a bigger return. Is the new walbro 450 the same physical size as the walbro 400? Do you have flow rate comparisons between the two? Or is it just 50 more lph than the 400? If so I may be tempted to purchase one myself, it's a direct replacement for my OEM pump (same dimensions).