85 5l with cfi convert to mpfi with same pump? November 22, 2013, 07:31:16 PM My bird has a 5l with the cfi system in it. If i go with the ho top end can i keep the fuel pump thats in the tank now or will i have to swap it out? Quote Selected
85 5l with cfi convert to mpfi with same pump? Reply #1 – November 23, 2013, 12:14:15 AM the stock pump should do just fine, unless you are going for a big increase in power over the stock engine. Quote Selected
85 5l with cfi convert to mpfi with same pump? Reply #2 – November 23, 2013, 10:23:36 AM Does your car have the low pressure pump in the tank and the booster pump on the frame rail near the rear of the car? If so then you will need to change the in tank pump for sure. If you already have the high pressure stand alone pump in the tank the other question you may want to ask is how old your pump is and maybe its time for some preventative maintenance rather than towing the car home at some point and changing it then.Darren Quote Selected
85 5l with cfi convert to mpfi with same pump? Reply #3 – November 23, 2013, 12:43:48 PM I agree with aero it's good insurance to upgrade. another question what size injectors do you have if they are off of the HO they should b 19# I'm not sure if they work with SO engines guys chime in at any time I may b wrong Quote Selected
85 5l with cfi convert to mpfi with same pump? Reply #4 – November 23, 2013, 01:02:23 PM Research will help a lot coolcats.net mustang forums and our archives, figure goals vs budget and go from there. Quote Selected
85 5l with cfi convert to mpfi with same pump? Reply #5 – November 25, 2013, 01:40:11 AM have not ben on the computer in a while sorry ill look in to colcats i beleave its the high presure pump 42 psi i think. It has the stock cfi with 2 fuel injectures in it not sure the size injectorseems to hold the car back wuit a bit Quote Selected
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