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-   1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks (https://www.ford-trucks.com/forums/forum37/)
-   -   EFI Conversion (https://www.ford-trucks.com/forums/1570945-efi-conversion.html)

SIRHEN09 01-31-2019 08:05 PM

EFI Conversion
 
Hello everyone, I have a 1985 F-150 XLT Longbed. It has the 351W with a 4barrel in it. I am looking at doing a EFI conversion and I am looking to see if anyone else have done it and if it was worth it. I appreciate all the feedback I can get. Thanks.

NotEnoughTrucks2014 01-31-2019 11:11 PM

All depends on what you are expecting from an EFI conversion. I am a firm believer in the superiority of EFI over carburetion, but if you are expecting to unleash herds of untapped power, you will be disappointed. Modifications for power gains are handled easier with old school methods. OEM EFI calibration is a closely guarded secret that is difficult to unlock. Some of the aftermarket products may offer better tuneability, but you are giving up the ease of service that OEM offers. Be ready to learn how to work on your own system because you are creating something unique.

If you are an off roader, fuel injection offers a huge advantage in that the engine can operate efficiently off level. General driveability of a properly calibrated EFI system will be equal to the best carbureted applications without the need for constant tweaking as conditions change. Bet that will draw some rebuttals, but I'll stand by it.

Installation will be a bear. You will have to change fuel lines to exhaust systems and everything in between. You possibly could use 85/86 5.0 EFI components to do this or you could custom fabricate a wiring harness. It's not undoable, but it is a very large undertaking.

Olds64 02-01-2019 07:30 AM

I've considered the Holley Sniper EFI for my classic Oldsmobile. FiTech is well rated too. Installation shouldn't be too hard, especially if you are handy and do most of your own wrenching. Of course, cost is an issue. You could probably source parts for a factory :oval EFI system much more reasonably from a salvage yard.

ncoonen 02-06-2019 03:20 PM

I have an '83 F150 shortbed 4x4 4-speed with a very tired 4.9L I-6 that is going to be replaced by a freshened 351W this spring. I am considering the FiTech throttle body system instead of an Edelbrock 1406 600cfm 4bbl or something similar. I live at 7,600' elevation so carb drivability can be an issue if you aren't careful with your tuning. The self-tuning nature of the throttle body efi systems is very attractive in this situation but cost is an issue. I also have to revamp the fuel delivery system to provide 60psi of fuel pressure to the FiTech injection system and there are several ways to crack that nut. I would love to hear from someone who has successfully retrofitted a stock fuel tank with one of the in-tank high pressure pump kits. Or, if someone has done an external frame rail mounted pump setup that they are happy with. Sorry for the sort-of hijack but since we're going the same direction, I thought I'd ride along.

Thanks...ned.

FuzzFace2 02-06-2019 04:59 PM

Ned, you may want to check out the performance area http://www.ford-trucks.com/forums/forum9/
Look thru some of the older engines to see if someone has done this.
I know someone did this on a 300 six so don't over look the non v8 motors.

I also don't know if there is anything in this area http://www.ford-trucks.com/forums/forum10/
Dave ----

85e150 02-06-2019 05:04 PM

FuzzFace2 may be talking about this superbly documented thread in the 300 six forum:

https://www.ford-trucks.com/forums/1...i-install.html

FuzzFace2 02-06-2019 05:18 PM

Yes that is the one I was thinking of.
Dave ----

jackietreehorn 02-07-2019 09:24 AM

350 chebby TBI could be installed from the junkyard for CHEAP. If it were me, I would graft the Ford MPI from a 96-97 5.8, using GT40 heads, cam, headers, etc.

dziwei 02-07-2019 01:35 PM

1985 F150 351w H.O. 4bbl Auto For my retirement I would like to get this rig to start/idle/run/restart in all weather, needs to be uber reliable as I won't be able to work on it as much. EFI sounds good to me, can the later versions 1990s 6cyl 300 be put in these older trucks? Needs computer and O2 sensors I imagine, would the later automatic transmission work? what else? would it work without a corresponding instrument cluster? -OR- would an EFI throttle body be better, I see those need updated fuel delivery, higher pressure and venting tank?

Just let me know if a new thread for this makes more sense...

jackietreehorn 02-07-2019 02:30 PM

Throttle body is easier and much simpler than stock ford type. You get to keep the V belts and and most of the original set up. However most of the reliability issues in old carb vehicles comes from plain old wear and tear and just hacked up systems.

With fresh components, a well maintained carb vehicle is pretty reliable.

matthewq4b 02-07-2019 03:04 PM


Originally Posted by jackietreehorn (Post 18467770)
Throttle body is easier and much simpler than stock ford type. You get to keep the V belts and and most of the original set up. However most of the reliability issues in old carb vehicles comes from plain old wear and tear and just hacked up systems.

With fresh components, a well maintained carb vehicle is pretty reliable.

Yup second that. A non emissions carb is simple and reliable . Especially if you go the 4100 Autolite route Fuel economy approaching EFI with better reliability and dead nuts simplicity. Ad not worry about Winter with one 80F to -40 they work with no issues. You just have to let em warm up for couple mins before setting off in winter is all.

dziwei 02-07-2019 03:49 PM

I like the sound of this 4100 Autolite, my '85 has smog pump and all that goes with it but if changing out the carb makes it more reliable I'm all for it. Is there a good thread for installing the 4100? I imagine linkage and choke are important points...

matthewq4b 02-07-2019 04:10 PM


Originally Posted by dziwei (Post 18467957)
I like the sound of this 4100 Autolite, my '85 has smog pump and all that goes with it but if changing out the carb makes it more reliable I'm all for it. Is there a good thread for installing the 4100? I imagine linkage and choke are important points...

It will be a straight bolt on no modifications needed just choke cap swap and you can use the one off the Holley currently on the truck. For the 351 you will want source a 4100 from a 352. I have used 4100's from 352's carbs on many 351W's and it is literally a drop on bolt and up affair. Alternatively there is the Summit M2008 Carb that is based off the 4100.

dziwei 02-07-2019 07:33 PM

matthewq4b: thanks. I saw a 4100 that needs 2 'tubes' and a choke on ebay for $80 they list it as perfect for: 240-289-352-390-427-428

are parts and rebuild kits easily sourced?

I rebuilt the Holley 4180c from my '85 and it started right up and ran for weeks (but ran rich and fouled plugs and now all the adjustments I've tried don't make it run reliably especially during cold spells) and that is the limit of my carburetor experience.


Olds64 02-08-2019 07:21 AM


Originally Posted by matthewq4b (Post 18468002)
Alternatively there is the Summit M2008 Carb that is based off the 4100.

The Summit carb is based on the Holley 4010, which in turn was based on the Autolite 4100. :o I would advise against the Summit carb. I have one one my Oldsmobile and it ALWAYS needs tinkering. :-arrgh My Olds ran much better with the rebuilt Quadrajet I had on it but I sold it once I installed the Summit carb. Oh well... at least I got some good coin for the Qjet. :-roll

If you are considering an aftermarket carb there are better ones out there for not much more money (Holley Street Avenger or Edelbrock Thunder AVS). If money is an issue then find an Autolite 4100 like was mentioned above in a salvage yard and rebuild it.


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