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Old 02-06-2023, 02:16 PM   #1
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Smile New Member with Carburetor Questions

Bought an 1984 Holiday camper on a Ford E350 chassis with 7.5 engine.
Camper is in good condition runs great.
Thinking about putting a EFI carburetor on it. Anyone have experience on this let me know how it worked out.
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Old 02-06-2023, 04:50 PM   #2
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Welcome aboard!
Do you mean a TBI system? No. What is your goal?
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Old 02-06-2023, 05:26 PM   #3
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There isn't really such a thing as an "EFI Carburetor". There are two forms of Electronic Fuel Injection (EFI)that are offered as aftermarket conversions. First is Throttle Body Injection (TBI). Second is Multiple Port Fuel Injection (MPFI).

I have installed several of each over the years. TBI is less involved and less costly. It entails a throttle body that replaces the carburetor on the original or a aftermarket intake manifold. It uses a higher pressure electric inline fuel pump. replacing any original fuel pumps. It requires installing a fuel return line from the throttle body to the tank. Often, that is the hardest part of the install. Unless your system has an existing return from a mechanical fuel pump. If not, tank may need to be removed and a bulkhead fitting installed. TBI will have a computer (ECM) to locate inside and a ready made harness to wire it up. There are a few sensors, coolant, vacuum etc.

I like Holley's kits. There are a number of manufacturers to compare.

MPFI is more involved and higher cost. It requires a custom made intake manifold that includes 8 port fuel injectors on fuel rails. Manifold has a throttle body itself but no fuel goes to the body, just air. Higher pressure electric inline pump. Return line needed. Exhaust pipe needs a bung to mount an oxygen sensor unless you already have an O2 in place. Then just replace it. Distributor needs to be removed and internal parts replaced with hall effect device included in kit. ECM installed with more involved wire harness.

I like Edelbrock's Pro Flow system. There are others as well.

These systems are programmable with a handheld device that comes in the kit.

If you can justify the cost, you will love the results. TBI is a huge step up from a carburetor. MPFI is just better than TBI, not hugely better.
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Old 02-06-2023, 07:36 PM   #4
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If you're looking for a little more grunt. First change out the timing chain and gears for a 1988-1997 460. This will get the camshaft indexed forward where it should be, and you'll have a double row chain to replace you old morris silent chain.
Then consider headers. The 460 exhaust ports are NOT great and can use all the help they can get. You've got to get the exhaust out before you can get the fuel in.
Then If you still want more, consider injection.

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Old 02-15-2023, 01:59 PM   #5
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Quote:
Originally Posted by wspike View Post
Bought an 1984 Holiday camper on a Ford E350 chassis with 7.5 engine.
Camper is in good condition runs great.
Thinking about putting a EFI carburetor on it. Anyone have experience on this let me know how it worked out.

Lots of companies sell units to replace carbs.
Well worth it, Look at HOLLY.

I installed a HOLLY - SNIPER EFI SELF TUNING kit on my
All Original 1978 JEEP CJ-7 with a factory V-8 - 304 with a Turbo 400 Trans
I love it... it was about $1,300.00 plus tax.

The units are self-learning and are for the most part Plug and Play.
If you are not up to the task they can recommend install companies.

Research this topic as many companies besides Holly, offer EFI products to get rid of the problematic Carb.
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Old 02-15-2023, 03:44 PM   #6
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Not worth the cost or hassle !

TBI or MPFI injection by themselves do NOT add power. It is the redesigned manifolds that add power. Plus better ignition timing.
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Old 03-02-2023, 11:32 PM   #7
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Thanks for the info

Found a system from ACEís that has the electronics that you can mount away from the distributor.
They call it an EFI system but really is a TBI .
Wish me luck as this is what I bought.
Iím tinkering with it getting everything read to install.
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Old 03-03-2023, 07:27 AM   #8
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Quote:
Originally Posted by code2e View Post
There isn't really such a thing as an "EFI Carburetor". There are two forms of Electronic Fuel Injection (EFI)that are offered as aftermarket conversions. First is Throttle Body Injection (TBI). Second is Multiple Port Fuel Injection (MPFI).

I have installed several of each over the years. TBI is less involved and less costly. It entails a throttle body that replaces the carburetor on the original or a aftermarket intake manifold. It uses a higher pressure electric inline fuel pump. replacing any original fuel pumps. It requires installing a fuel return line from the throttle body to the tank. Often, that is the hardest part of the install. Unless your system has an existing return from a mechanical fuel pump. If not, tank may need to be removed and a bulkhead fitting installed. TBI will have a computer (ECM) to locate inside and a ready made harness to wire it up. There are a few sensors, coolant, vacuum etc.

I like Holley's kits. There are a number of manufacturers to compare.

MPFI is more involved and higher cost. It requires a custom made intake manifold that includes 8 port fuel injectors on fuel rails. Manifold has a throttle body itself but no fuel goes to the body, just air. Higher pressure electric inline pump. Return line needed. Exhaust pipe needs a bung to mount an oxygen sensor unless you already have an O2 in place. Then just replace it. Distributor needs to be removed and internal parts replaced with hall effect device included in kit. ECM installed with more involved wire harness.

I like Edelbrock's Pro Flow system. There are others as well.

These systems are programmable with a handheld device that comes in the kit.

If you can justify the cost, you will love the results. TBI is a huge step up from a carburetor. MPFI is just better than TBI, not hugely better.
Does the tank really need to be dropped to install a return line? Why not tap the return into the tank filler vent line instead?
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Old 03-03-2023, 01:29 PM   #9
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Quote:
Originally Posted by wspike View Post
Found a system from ACEís that has the electronics that you can mount away from the distributor.
They call it an EFI system but really is a TBI .
Wish me luck as this is what I bought.
Iím tinkering with it getting everything read to install.
The Ace's system is very similar to Holley's TBI system. I have installed 2 of those. Be sure to use fuel injection hose to install the fuel pump. Also replace any rubber fuel line on your chassis. It is old and not rated for the higher pressures.

Installation is straightforward for the most part. Just find the easiest way to get the fuel return line back into the tank, leak free. I do bulkhead fittings into the tank. You may choose another way. If you go into the fuel filler, be sure it slopes enough toward the tank.
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Old 03-03-2023, 01:37 PM   #10
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Quote:
Originally Posted by TandW View Post
Does the tank really need to be dropped to install a return line? Why not tap the return into the tank filler vent line instead?
I have always used a bulkhead fitting to return to the tank itself. Sometimes that can be installed with the tank in place, some must be dropped.

It is possible to return to the filler neck. The neck, being small diameter & round, can be harder to get a good seal. But it can be done. One should be sure of enough slope to keep fuel from traveling towards the filler cap.
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Old 03-03-2023, 10:38 PM   #11
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Fuel return line .

My motor home chassis has duel tanks that has a return line that already is directed back to the tank through the tank selector solenoid, I was planning to use the same return lines from the dump of my fuel regulator.
Yes I am replacing all fuel lines with injection hose, that has already been planned.
The guys from ACE’s have been very helpful in any questions I had before I even started this project, THANKS to those guys for my questions that I had . The only business that I ever called with questions that I didn’t have to press 5 buttons on phone and put on hold with horrible music. These guys answered the phone themselves right away and had every answer to my questions. Thank you guys.
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