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I've got an aftermarket fuel reg but when it was installed they left the standard one plumbed in as well, but i just want my aftermarket reg to control the pressure. I'm told i can just disconnect the vacuum supply to it and that will disable it? Just want to double check before i do it.

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https://www.sau.com.au/forums/topic/48724-disabling-standard-fuel-reg/
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It will disable it, but the pressure will stay pegged at 43psi, and will not go below this. Best thing to do is set a base pressure of ~50psi on the new reg, so that when under vacuum the pressure will drop accordingly. However you will need to adjust the fueling to suit.

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