EFI to Carb Ignition Problems
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From: Glen Flora USA
EFI to Carb Ignition Problems
I've Posted before that I was doing an EFI to Carb swap on my 87 F-150. I made the swap I unhooked the high presser pump and put a regulater on the intank pumps. I went to crank it over and it was popping!! But, after that a wire by the fuel pump relay (by the air cleaner box) smoked up on me, it was the one with the fusable link on it(goes to show how that works). So now I bypassed the relay and ran a hot wire to the pump (so it runs constantly). Now I have no spark, what does that have to do with the ignition? I have power going to the coil and the tach moves while the engine turns over. Did I take the ignition modual out? If I swap distribiters from my 77 with the square seperate brain box would I still be able to use my altinater I dont want to change all of my pullys? What all would it take to go to the older ignition I have a doner.
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From: Virginia
EFI to Carb Ignition Problems
Putting the older ignition on would be the way to go, since it will advance the timing properly. The ignition you have now is interconnected through the computer which controls advance and controls the fuel pumps too. That fusible link that went out may have powered the computer or part of it's systems, and now that being lost, may be why it doesn't work. But there is going to be some wiring involved in hooking the other ignition up.
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From: Glen Flora USA
EFI to Carb Ignition Problems
Sounds Good!!! I have a 72 montego for a doner with the ignition and distributer on it. Thanks for the link you can't put it in better english!!!! A local junk yard said they would sell me the setup for $25.00 not bad, I suppose they are getting out dated. Another question, will it be ok to run my in-tank fuel pump at all times or should I find a low pressure aftermarket and put it in the place of the high pressure pump.
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From: Virginia
EFI to Carb Ignition Problems
I don't know about the fuel pumps. Does the regulator you have, have a return line on it? That's how the original efi fuel system worked. Any excess fuel was directed by the regulator back to the fuel tank. I wouldn't think the original fuel pumps would last very long if the regulator you have had one line in and one line out so the pumps would "dead head" or back up with excess fuel pressure. Some guys on this board have used a regulated system for their carbs and I guess it works ok, but I like conventional tried and true stuff like a pump made for a carb system. I think I would get an older style gas tank and convert the whole thing to the carb system.
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From: Glen Flora USA
EFI to Carb Ignition Problems
If a change the timing cover and relocate the Power steering pump would a manual pump work?(87 302) I heard that there is no loab on the cam to run it. I do only have the 1 in 1 out regulator. Do you know a place to get a regulator with a return line on it with out spending an arm and a leg?
Thanks again for your advice!!!
Thanks again for your advice!!!
Postmaster
Joined: Nov 2001
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From: Escondido, CA
EFI to Carb Ignition Problems
You could run a fuel filter that has the return line. Put it between the pump and the regulator if possible.
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From: Glen Flora USA
EFI to Carb Ignition Problems
Is there a relief valve on the filter? Where do I go about finding one of those?
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From: Virginia
EFI to Carb Ignition Problems
If you didn't mind all the work, you could change the front cover to mount the fuel pump. As far as the cam to run the pump, it just bolts to the front of the cam gear. It's a two piece set-up. Your engine now has part of this set-up to act as a big washer to hold the cam gear on. Wherever you got the front cover, I would get the fuel pump cam too. I am assuming you have a serpentine belt system, and I am not familiar with the mounting system on these, but my v-belt system has power steering and it's close, but the fuel pump has room to fit behind it.
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From: Glen Flora USA
EFI to Carb Ignition Problems
I'll probably go with the manual rout I wonder if the pump will suck through the electric pumps if so I will have to get an older model tank switcher.
Thanks again all
Thanks again all
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From: Gravel Switch, KY
EFI to Carb Ignition Problems
I have been using the in-tank pumps to feed my carb conversion for 2 years now without nary a problem. I do have a in-line regulator but am not using a return line. You will have to ditch the serpentine belt setup in order to run a mechanical pump because the power steering pump is in the way. You shouldn't have any problem with the electric setup once you get all the bugs worked out.
DannyP
DannyP
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From: Virginia
EFI to Carb Ignition Problems
Danny P, does your set-up have the low pressure pumps in the tanks, and a seperate high pressure pump on the frame? I think the low pressure pumps put out about 9psi don't they? If that is the case, I could see where that might work. I am not familiar enough with the different changes they made in the fuel systems, but I was worried about regulating a 40 psi pump down to 5-6psi for the carb.
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From: Gravel Switch, KY
EFI to Carb Ignition Problems
>Danny P, does your set-up have the low pressure pumps in the
>tanks, and a seperate high pressure pump on the frame? I
>think the low pressure pumps put out about 9psi don't they?
>If that is the case, I could see where that might work. I
>am not familiar enough with the different changes they made
>in the fuel systems, but I was worried about regulating a 40
>psi pump down to 5-6psi for the carb.
I disconnected and removed the high pressure pump mounted on the frame rail. The pumps in the tank put out about 6-7 psi according to my gauge, which is a bit too high for a carb so I installed a regulator.
DannyP
>tanks, and a seperate high pressure pump on the frame? I
>think the low pressure pumps put out about 9psi don't they?
>If that is the case, I could see where that might work. I
>am not familiar enough with the different changes they made
>in the fuel systems, but I was worried about regulating a 40
>psi pump down to 5-6psi for the carb.
I disconnected and removed the high pressure pump mounted on the frame rail. The pumps in the tank put out about 6-7 psi according to my gauge, which is a bit too high for a carb so I installed a regulator.
DannyP