Efi To Carb Plz Help

Lscam580 said:

I've honestly done just about everything. Carb it goes.. How do I use stock fuel pump and still run a carb

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You don't, you will need a carb fuel pump. EFI pumps are alot of pressure damn near 6 x's the amount of pressure you want on a carb setup. I have a carb setup. Although I agree with others, if I had factory EFI. I would never convert it to carb, unless it was strictly drag and I had absolutely no one to help tune.

Lscam580 said:

I replaced all rubber hoses,shot small amounts of break cleaner to each rubber connection, intake gaskets, upper and lower. Changed out new pcv, sprayed every where. I do have a Mallory adjustable fuel pressure regulator from 60psi to 2psi that will work for a carb won't it that's y I bought it. I'm half temped to sell the stupid car and start over

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You can regulate down into carb pressure range with that regulator. Not completely positive, but regulating an EFI pump that isn't meant to put out that little pressure will kill the longevity of its life. From what I recall though, if you had a fuel pump controller that would work safely. Someone will correct me if I'm confused.

Lscam580 said:

I replaced all rubber hoses,shot small amounts of break cleaner to each rubber connection, intake gaskets, upper and lower. Changed out new pcv, sprayed every where. I do have a Mallory adjustable fuel pressure regulator from 60psi to 2psi that will work for a carb won't it that's y I bought it. I'm half temped to sell the stupid car and start over

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I am a carb advocate, (one of the few) and you run this gauntlet everytime you make a post like yours here.
The fact of the matter here is that whatever is wrong w/ your current system, it will go away as soon as you swap over to the carb.The biggest reason for that will be that whatever is currently wrong w/ the EFI system, you are applying a shotgun blast solution to a bullet hole problem.
The one thing you will have to do if you do convert over however, is change out the FI pump, and use that Holley blue to deliver the fuel. Using that mallory reg that you have is asking it to restrict too much FP, (kinda like you pinching off a garden hose that has the water turned on full blast) and sooner or later either the pump will give up based on the constant restriction, or you'll spring a leak, and I don't have to tell you that could be a bad thing real quick.

What you'll get when you convert is a car that'll require a technique to get it started, and will more than likely require some time spent changing out things like jets/metering blocks, power valves, and squirters. The fact that the carb doesn't meter fuel as efficiently as a properly working FI
system does, you will probably have a more notably rougher idle, and all of those changes you make to the carb will have to be changed when, and if you ever drive into a significant elevation change. All stuff a good working FI system will compensate for automatically.

I'd keep trying to save the EFI if it were me. It's there, it's working, and if and when you find what's wrong w/ it, your current self will thank your future self for not changing it over.

You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without spending a lot of time and money. I continue to update it as more people post fixes or ask questions. You can post questions to that sticky and have your name and idle problem recognized. The guys with original problems and fixes get their posts added to the main fix.

It's free, I don't get anything for the use of it except knowing I helped a fellow Mustang enthusiast with his car. At last check, it had more than 159,000 hits, which indicates it does help fix idle problems quickly and inexpensively.

If you have worked your way though the checklist, let me know. I will ask you some oblivious questions and maybe even some irritating ones. It is for the purpose of understanding what you have for mods and then what you have or haven't done on the checklist