1989 efi to carb conversion

[runningwild]

I see alot of questions about converting from efi to a carb .I completed mine so if any one has any questions,I will be glade to answer them.

 

[O'Rattlecan]

Do you have any photos of your transformation? What are the specifications of your truck?

Ryan

 

[johny89]

picking up this old thread because i have a question about a conversion: can it be done easily?
put on a carb on the headers and take out the computer/eec relais? or isn't it that easy?

and what power loss should i expect?

i already have a liquid gas carb on it and to make the car even more reliable i would like to put a fuel carb on it aswell

 

[5.0Flareside]

What?? You don't put the carb on headers.. Headers are exhaust..


A switch to carb is waste of time and a loss of reliability.. EFI self adjusts some and is easier on cold days. Much more efficient and better gas mileage


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[johny89]

What?? You don't put the carb on headers.. Headers are exhaust..


A switch to carb is waste of time and a loss of reliability.. EFI self adjusts some and is easier on cold days. Much more efficient and better gas mileage


Sent from my iPhone 4 using Ford Power

sorry meant intake manifold, translation mistake
i start the engine on the liquid petrol gas so that's no issue, neither is mileage,
would use manual choke, and if i don't loose to much Nm with a carb on it thats no problem either.
and as there are no relay nor comps involved so more reliable... less is more

 

[5.0Flareside]

even though i totally think this is a terrible swap.. heres what you'll need as far as i can think..

either a low pressure fuel pump or a fuel pressure regulator.. EFI runs low-mid 30 PSI fuel pressure.. carb is around 5-7

you'll need probably a new throttle cable. one that will fit a 80-86 carbed truck will work same basic fire wall and distances and pedal connections.

you will lose power because the EFI is the most efficient. and when something is efficient it can build power easier.

you will still need a computer possibly depending on transmission. if it's a E4OD trans you'll need a standalone trans controller when switch to carb.

probably need a different distributor and Spark ignition system..

 

[m78]

Chris, he's in Koekelare, Belgium and wants to run on propane. And only use the gas to start the engine. So which would be better for him.

 

[johny89]

do i need to take the whole fuel rail of?
rather get a donor car or just an engine or just the parts?

 

[kiwi f150]

If you have access to a parts truck you'll be able to get all the bits you need to convert it such as intake manifold ,carby,throttle cable,coil,distributor - that year of your truck if auto will most likely be aod so you will need an adaptor for the tv line to mate up with the carb unless you can get an aod carb from an 83 through 86 f150. Possibly have to change your lpg mixer ring depending on whether it will fit on top of the new carburettor.
If it was me i'd leave it electronic and just buy some of the common parts that break down from places like rockauto.com , also I would look at switching from the fumigation style lpg system you have now to an injected gas system as it will be more economical and also more powerful - prins make a good unit in your neck of the woods.

 

[johny89]

truck has a c6 tranny so that won't give problems, was thinking of putting carb on it for the fail safety and because when i rebuild the car/engine I'd like to put a supercharger on it.

and i have seen a few lpg installs (not prince i think) which have a huge bundle of wire going to it and then having faulty contacts, non working relais etc

 

[johny89]

so i should find a donor truck then or just the parts since i'll be putting other carb and intake on it?
and would it run with my low pressure in tank fuel pump?

 

[Fellro]

Essentially, you swap everything from the heads up. You can re-use the heads, just swap intakes. As noted, the distributor will not work properly once you ditch a lot of the electronic sensors that go with the injection system. You have two-stage pump setups on your truck, so you could take the high pressure pump off the frame rail and run by the low pressure transfer pump that is still in the tank. You will likely have to wire the pump to be run only when you need it. A regulator is still a good idea though. You wouldn't have to get a parts vehicle to do this though, as you only need the intake, carb, distributor, regulator and air cleaner. You likely would need a propane diffuser that fits the carb.

 

[johny89]

so been studying a bit about the ford injection, and found sruff making me decide to keep the efi after all but now i'm stuck with questions about this, should i ask them on this thread or start a new one?

 

[5.0Flareside]

Start anew thread.. But staying fuel injected is the way to go


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