Holley sold a TBI kit like this back in the late 80's. I had converted my 84 carbureted Camaro. After a year the ECU failed just short of warranty so I went back to the rochester carb. It was a costly kit back then and a costly repair. Since this is unlikely a potted ecu, I would highly recommend you mount the ecu on rubber vibration dampers and mount it as high as possible as it likely will be exposed to moisture

1.4k views and only a few subscribers.....typical KZfaq stuff. I subscribed to your channel. Great video.

amazing video loved the small humor in it great job man hope she is alive and well.... that sound at 4,400 is such a beautiful sound the women won't understand... my wife is the same way lol

Very nice. One suggestion: you may want to install a fitting to transition between the metal fuel line and the fuel hose rather than ring clamping directly to the metal line. This way it would be USCG compliant and less prone to leaks.

Great work! you can see the biggest advantage of efi over carbs is better cold starting and smoother running....too bad that you didn't have the best carb used on marine engines (Rochester Quadrajet) which has not been made since 1990, these when properly set up run almost as well as fuel injection, cold starts are not as good as efi but overall running and power is excellent. I have one on a 1988 4.3 same engine as yours but the older pre Vortec with no balance shaft. They are complex to rebuild for a beginner but once you do it, the next time it's easy. I think they are superior to both the Weber and Holley marine 4bbls. For carbs the cost factor is a big plus as rebuild kits are only about $50 and the older engines could use the simple and cheap to replace mechanical fuel pumps. Even the electric pumps for the lower pressure of a carb system are not expensive. Also, you might not be aware of this but I felt the need to point it out, those one piece exhaust manifolds are known as engine killers, they were cast poorly and have inconsistent wall thickness. When they fail (crack) they will put water right into a cylinder and rust the cyl walls and valves. Get rid of them before its too late. Barr Marine makes a nice conversion kit. Merc only made them for 3 years because of the casting problems. I had the OMC version of the same design on my 4.3 and never had a problem but I guess I just got lucky, I did convert it over to the later OMC/Volvo 2 piece exhaust style.

Sounds like a lot of work !

Nice job!

I’m surprised to read that you lost some hp. I have a 5 litre carb and from what I have seen is the 5 litre fuel injection has like 40 or more horsepower.. I was considering doing the switch only for more horsepower.

I did the same conversion from affordable fuel injection. Works great. Curious, how did you end up wiring your shift interrupt switch? I had mine wired up to the negative side of my coil to interrupt the pulsing. My ignition module (inside the distributor) recently failed after about a year of use and I’m not sure if that was because I grounded the unit (at the negative post on the coil) via the shift interrupt switch or if it’s just a fluke… curious how you wired yours up. Thanks in advance

Thanks for sharing

Where is this kit from?

Fuel line is safer with a hard line because of the heat of the engine. You don't want a hose with fuel melting on top of your engine 🫠

How has the conversion been holding up so far? Have you had any reliability issues? I'm thinking about getting one of these kits for my Ski Centurion with a Ford 351W.

All the people asking what brand and where. Does nobody click on more in the discription?

we have a mercruiser 5.7 that upgraded to a rochestor tbi product... Im having trouble finding out what wire matches with the green/white wire comming from the module on the manifold riser? wiring MESSS! Any help?

I want to do this to mine.

Can we have a video of this out on the lake now? Are you pleased with the Lake performance?? Any concerns crop up since installing it? Any regrets?

Gday Brian. Did that kit come with an oxygen sensor?

Wonder if they make one of these for the 4BBL version of this motor

Where did you purchase this kit from? Or did you just source each component

Great job do you have to put a fogging oil on it when you winterize it like the carb?

Hi, can you tell me where I can buy EFI for mercruiser 4.3?

Você tem peças usadas do motor mercruiser v6 ?

Hi I have a 30 maxum boat with twin 4.3 motors i would like to change like you did were can i buy the kits like yours?

Can you tell me where you put the O2 sensor?

Hello I am doing something similar. Where did you hook the crank singal wire to on the coil?

Where you purchase, kit EFI conversion My mercrusier mariner 4.3 its a boat tahoe 2008 excelent, thanks

How is the coil connected? Do you have a white and a pink wire connected to it? If so which one is on the + and which one is on the negative?

What is the name of the conversion kit and where to buy it?

Hi where did u bought this system and how mutch it cost

I have the same motor..what fuel injection kit is that?

You were able to use the stock fuel pump?

So you running fuel injection with carb fuel pump?

where can I find this kit?

Where did you purchase the kit from

How much less does the engine this way?

Wait, what's the power steering pump for?

which kit did you install?

what kit is this

Although it will run you should never install auto parts on a marine engine. The results can be catastrophic.

Is there a part number for the kit?