1998 Mercury 225 Carb rebuild....

[DavidWebb]

Well, I guess the boat isn't fixed...took it to the lake last night, alarm still sounding, still won't plane out. I did notice that when you prime the bulb the filter is full (glass inline filter), but when you're on the water, the filter is almost empty. Could that be the fuel pump not pulling enough or the filter in the tank is clogged or it's doesn't have enough vacuum for the fuel pump to work properly or that wouldn't have anything to do with it??? All I know, he said it was ready to go, we went and it's still doing the same thing. emoBang emoBang emoBang emoEnforce emoEnforce emoHoppingmad emoHoppingmad emoBadLanguage

 

[wrechin2]

That is kinda normal on the filter unless you are up and running and have a constant fuel demand, because some will drain back into the tank. Make sure the filter is tight. I personally HATE those filters. I had a Mustange catch on fire because of one of those filters. They loosen up too easy. Pump the bulb just prior to coming out of the hole and see if it makes a difference. This will help indicate a fuel supply issue. But doesn't explain the alarm. JMO

 

[jbh3]

Have you tried running the engine on a separate, portable tank with known good gas? I know Merc doesn't like/recommend a lot of those in-line filters. There are a few they will "tolerate". You must be very careful about fuel flow restrictions. Hope you figure it out soon.

 

[DavidWebb]

The inline filter has been on since January. It ran fine up until I took it to a "boat" mechanic the first week of May. I have noticed since then the filter hasn't been staying full. Or staying a quarter full even.

 

[DavidWebb]

Gonna pull the back deck off tomorrow so I can get to the tank and pull the fuel pick-up out just to see if the screen is clogged.

 

[DavidWebb]

I did try pumping the bubble last night and it didnt make any difference. The filter would fill up while I was pumping, then go back down soon after, with no change in the engine planing out.

 

[wrechin2]

Some of the fuel will seep back into the tank, that is why the filter will loose some of it "fullness". When the demand gets high (going down the water) the filter will slowly become full on its own. If the carbs are full just before you take off and it has no effect, then it is more than likely not a fuel delievery issue. Most of the time you will pump the bulb prior to taking off and it will do good for a short distance and then lose power. I doubt if you need to go through all the work of taking it apart.

I am going to PM you a link to download a Mercury factory service manual from a site I use to transfer large files to people. You will need to download it and unzip it. It may be of use to YOU in trying to figure it out. Hope this helps!

emoToast emoToast emoToast

 

[jbh3]

If you're going to pull the sender/pickup, you might want to consider replacing the fuel line and bulb with the new Merc ethanol resistant fuel line components while you're in there. Lots of issues with the older fuel lines being degraded internally by the ethanol fuel. Here's a good thread from BBC regarding this issue: http://www.bbcboards.net/zerothread?id=452043. Keep in mind, this applies to the fuel lines on the engine as well. Running on the remote tank would eliminate (or confirm) a fuel delivery issue from the tank to the engine. Good luck, and thanks again to James for sharing his expertise.

 

[DavidWebb]

Kudos to James, and a man from California. emoToast emoWorthy

 

[wrechin2]

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