i happen to have a 85 Mustang SVO which had a pump in the tank and a pump on the sub frame. However i have upgraded to a Walbro 255 that is plenty for the modifacations that i have. it is ok to only run the tank pump that is if it is addiquite for the mods that you are trying to support. also assumeing that this one pump is a good one also. you will need to keep the fuel filter, and do a fuel pressure test somewhere around 39 with vacuum line off regulator. remembering that fuel pressure should rise 1 psi for every 1 psi of boost. Get a fuel pressure gauge at advanced auto or autozone for like 30 bucks.
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