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What size do you suggest, based on my system ? Looking to support 500hp.
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I would run an -6 AN fuel pressure line and -8AN from the tank to the swirlpot and to the pump,as mentioned above.You will need more pressure and volume than what you have now.If you run 3 bar of fuel pressure and 1.5bar of boost,you will need 4.5 bar minimum fuel pressure at the flow rate your injectors will be flowing. A good fuel pump that is also very reasonable is the walbro 392,and it is E85 compatitable.
http://www.fiveomotorsport.com/fuel-pumps/?itemid=12