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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

fuel injection to carb conversion

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Old Oct 27, 2003 | 08:10 PM
  #16  
90f150moneypit's Avatar
90f150moneypit
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From: Still under the hood in O
Thank you, I think i will do as I want.

I am offering experience, not random speculation or opinions. If someone ask's a question and I know for fact the answer, I will give that answer.

If someone, including me, wants to make a conversion to suite THEIR needs, that's THEIR perspective. When someone ask's how to do it (not if they SHOULD), as what this board is for, they have the right to hear from people that have done it or know FIRST HAND how it was done.

The conversion is for performance, and/or, ease of obtaining and maintaining it. There is a LOT less that can be done with EFI (MAF or SD) than can be with a carb without making other costly changes that normally wouldn't be necessary, period. If someone wants to convert to carb just because they are more comfortable with it, so be it.
 
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Old Oct 27, 2003 | 08:39 PM
  #17  
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EPNCSU2006
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From: Concord, NC
I will quote myself: "it's your truck, do with it what you will." I'm offering my thoughts on what is involved as are you, which is what this board is for. You are correct that I don't know some of these things because I haven't tried this conversion before, and don't understand the need to either, but again, not my perogative. I was offering my thoughts on what all is involved so that the person asking the question wouldn't get half way into the swap and realize he's in over his head. Don't tell me that you can't make the same power with EFI that you can with a carb, because you can. Is it more expensive? Maybe so, maybe not. If you want to run a carburetor, go for it, it won't bother me. Oh, and you speak from experience? Your first post says "I too am going to..." I took from that you haven't done so yet. That puts me and you at the same "experience" on this swap.
 

Last edited by EPNCSU2006; Oct 27, 2003 at 08:41 PM.
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Old Oct 28, 2003 | 12:50 AM
  #18  
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Txquadhunter24
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I'm with EPN I was going to go this route with my 86 302EFI after much research I learned even my older EFI system would Take more to convert back to carb. Nothing under the hood of a EFI truck will run a carb'd motor It'll all have to be swapped. But if money and time allows it, it can be done.
 
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Old Oct 28, 2003 | 01:08 AM
  #19  
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From: Ashland City, TN
I'm not sure why you would want to switch to carb. I would keep the fuel injection personally.
 
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Old Oct 28, 2003 | 08:18 AM
  #20  
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thanks for all the information. I've been wondering about this conversion for a very long time but i've never talked to anyone who knew much about it until now. I appreciate all responses to this.
My original thinking was that this truck was to be my sons and he will want to put dual exhaust with glasspacks, mild performance cam....that sort of thing. I don't think those things mix well with factory fuel injection. logic would say...either leave this truck alone or get an older truck that was carberated from the factory. I don't want to get an older one because this truck is in excellent shape but it's not worth anything to sell because of the very high mileage. By the way.....this truck does have the AOD transmission...it is not computer controlled thankfully.
My first choice would be to put in an older engine with a carb so that we can do performance modifications (such as cam) without worrying about the fuel injection any more. The ignition system is not a problem, I can convert that. The biggest problem is how to draw fuel out of the tanks. My preference would be to use a manual fuel pump but I can't imagine how that would draw fuel through the old fuel pumps or switch tanks. Sounds like i'll have to use the existing electric pumps.
Since i have to stick with the fuel injection pumps, i'm swaying to sticking with the entire EFI system.
Do you guys think that the EFI system would still function properly with dual exhaust?? My neighbor took the converter out of his exhaust system on a ranger and the engine ran too lean and was ruined.
 
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Old Oct 28, 2003 | 12:00 PM
  #21  
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EPNCSU2006
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From: Concord, NC
Originally posted by ksvtwin
Do you guys think that the EFI system would still function properly with dual exhaust??
I think some people on here are running true duals with EFI with no problems. I can't say for sure, but it should be ok as long as you retain the O2 sensor in a location about the same distance from the engine as factory.
 
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Old Oct 28, 2003 | 02:47 PM
  #22  
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Txquadhunter24
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yes you can run true duels on the EFI trucks. I've got true duels on mine. I did mine this way, I put a crossover to mount the O2 in. Since it reads both sides coming thru the Y-pine. When in turn the crossover give the truck a better sound by equealing out the tones. If it's got to be done that way i don't know, Since I know quite a few who run duels and put the O2 in one side. As for mods for your EFI truck you can add cams and such to it without causing a problem with the EFI system. If you look there is tons of RV cams and such that is EFI compatable. If you do a net search you can find lots who are making 600HP with stock EFI systems. Just plain your build out and you'll be fine. If ya add the MAF converson your cams sizes are pretty much endless like carb'd motors. A Ford motorsports catalog can help quite a bit too
 
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