efi to carb conversion
 

has any of you guys ever done this conversion?i was told that all you need to change is manifold,carb,disturbertor,and fuel pump.does the engine wire harness have to be changed?i have a 1994 502,mpi.it is a vst type system.i have heard so many bad thangs about these motors.i have spent about 1700.00 so far and have had no luck.any ideas?

what have you spent 1700 on ?

I do,,,,, find another mechanic

I have no advice, only a question: Why go from EFI to a carb?

While I've only been into performance boating for a few years, I've been hot rodding for 20, and the advantages of EFI (efficiency, tunabiilty, minimal maintenace, and consistent power delivery regardless of lean\tilt angle) seem to outweigh the added cost and complexity.

yes it can be done its very easy and you dont need to buy a harness you seperate the 2 harnesses at the plug where the efi plug is. cut the plug of and that will feed your coil if need be give me a call i just did this 603 234 6363 Gordon

1700.00 was mostly on the fuel system.injectors cleaned.fuel pump r/r.distribor removed and cleaned,plugs,wires.i know very little about injecton.i have al the parts for the motor to do the conversion,except the wiring.i may not beable to spell,but i can work on a carbed motor.....lol.i have been chasing this problem for awhile and i am sick of it.i think it will be cheaper in the long run.

I went efi to carb on my 302 saves alot of room an makes for a cleaner looking motor. Wires you have to seperate cut off harness, need a 800dp holley , intake, I used my old disurbertor. Mine ran great but did give up a little IT WAS WORTH IT.

If i remember right you will be giving up around 4-5 MPH going to a carb in some cases.

well... like everything else, if the guy doesn't know what he is doing then you might as well just light the cash on fire. efi is easier to diagnose and repair than most other elements on the boat. you just need the correct tool , factory manual and fundemental knowledge that is required. you plug in the scanner, read the results, follow the diagnostic flow chart and fix whats wrong... once. you don't just throw parts at it or screw with it in some haphazard sense . the argument , carb vs efi always seems to presume the carbs always run well and the efi is always broken. this is nonsense. in my environment the carb guys re down far more often than the efi guys and even when they are running correctly, there are always some sort of nickle and dime mixture problems that make the boats run badly. the efi works very very well the vast majority of the time and when it does fail ... which mine has twice in 5 years... it repairs quickly and easily. are carbs simpler ? maybe... if you know about carbs. but for people that know the same amount about efi it is always a mystery why anyone would want a carb at all .

if you have spent 1700 with a mechanic on your efi and it still doesn't run then its the mechanic that's no good. not the efi . and i have $100 that says that if you have the same guy do the carb conversion, your problems are far from over.