97-99 Mercury efi's

[sqdqo]

Anyone using Mercury EFI's 97-99? Just looking for opinions on reliability, fuel economy, anything would be appreciated. Am considering a used 250 for replacement of my Evinrude 225 Ocean Pro.

 

[tashasdaddy]

Re: 97-99 Mercury efi's

you will have to change all controls, and wiring harnesses.

 

[WillyBWright]

Re: 97-99 Mercury efi's

And maybe a gauge or two. Tim gauges are different. Most others are universal or adaptable. V-6s suck lots of gas no matter who makes them. Expect about 8gal/hour ballpark @ full throttle.

 

[tashasdaddy]

Re: 97-99 Mercury efi's

i think the fuel usage is more than that.

 

[Silvertip]

Re: 97-99 Mercury efi's

I would guess fuel consumption is approximately triple that (depending on the boat) since my 75HP burns 7.5 g/hr at WOT as indicated on my fuel flow monitor.

 

[WillyBWright]

Re: 97-99 Mercury efi's

I'm going by my brother-in-law's bass boat with a 150 V-6 that drains a 12 gallon tank in 2 hours. Bottom line, the Merc is going to use about the same gas as the Evinrude.

 

[sqdqo]

Re: 97-99 Mercury efi's

Do you guys think that there is any appreciable fuel economy increase going from my old carburated 225 to the compuerized 250 EFI?

 

[kitebuz]

Re: 97-99 Mercury efi's

I'm looking into a similar situation - thinking about going from a pair of '89 Evinrude 120's to mid/late '90's Merc 200 EFI's. I have heard EFI's will see @ 15% better efficiency than a same size carb'd engine on same boat.

In my case, I think I will see some efficiency by running in a lower rpm cruise range. You won't see a big change in this dept going from 225 to 250. Cold starts might be a bit smoother for you, maybe a bit cleaner burning over-all. but I am guessing @ a 15% improvement in fuel burn in your case.

A Merc 275 Verado burns @ 9gph at cruise, so 8 gph on a 250 EFI @ wot is not going to happen - maybe times 3 if you are lucky.

 

[jimmbo]

Re: 97-99 Mercury efi's

The EFI burn as much as carbed engine( 22 to 25 gph), but they do have better throttle response. The DFI(optimax) is a different story, At WOT not much difference, at part throttle some difference depending on speed, at Idle these thing run forever on a cup of fuel.