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I have a 2000 mercruiser 250 hp 2 barrel inboard outboard. It starts and idles fine, I can rev it up in neutral with no problem. I can put it in gear and idle out the dock but as soon as I give it gas it stalls right away.I have changed the gas and water seperater in the fall. Is there anyone that has had this problem? Looking for some advice. Thank you.
sometimes there is another fuel filter were the fuel line goes into carb or may be electrical like bad condenser in the distributor
Could you be more specific on the engine? 5.0 - 5.7 L? It does sound like a fuel delivery problem. Ethanol can build up a lot of white crusty crud in fuel delivery components. Sounds like main jets could be partially plugged. Will it slowly gain speed if you throttle up slowly? Or will it die with any acceleration at all when engaged to drive the prop? How old is the fuel could be a bunch of water in it too.Quote:
Originally Posted by Greatwhitehunter
Had an IO that and had lots of trouble with bad fuel had to change the water separator a lot. The shift cable also stretched and had to be replaced because the neutral cut out switch would kick in at the wrong time and kill the engine as you moved the throttle.
I have had lots of water problems especially when using that crappy ethanol gas. I have an outboard, but one time I emptied the same separator about five times in a row until I started getting all gasoline. You can also try that dry gas stuff you can get at auto store. Good luck.Quote:
Originally Posted by Greatwhitehunter
A few years back with another boat had a similar problem to much time sitting on shore so called one of those boys for a dock call over the years and probably the ethanol usage by previous owner the gas lines got weak, the line would collapse when you tried to
accelerate starving engine for gas. I did not get to watch to see it collapse but replaced about 8 feet of hose and fished that afternoon and no problems then on.
Gene
Rochester carbs, as mentioned, have a small filter that'll do exactly that, let you start, idle, run, but it collapses if dirty and eventually won't even allow you to run fast at all. I always run Yamaha's Ringfree into my carbs when ever I let them sit. Most additives are isopropyl alcohol, which is great in the spring and such, but Ringfree has zyline(sp?) in it which cleans up your carb while it sits.
clean the fuel tank filter and check the checkball if gas is being restricted in the tankQuote:
Originally Posted by Greatwhitehunter
I had the same exact issue last season. It ended up being the anti siphon valve on the fuel tank. So follow your fuel line to where it connects to the tank. Your fuel line will be connected to the valve. It will unscrew from the pickup tube. if you look inside you will see a small ball that has a spring behind it. You will probable see rust. You can clean it or replace the valve with a new one... If you clean it, make sure the ball moves freely when you push it from the tank side.
A new one is about 15 bucks.
clean carb and if possible replace all old gas line. the inner wall of older gasa lines will separate causing you to not get enough fuel when placed under a load. i have had this happen to me before.
Does the engine restart immediately after it has stalled or do you have to crank it for a while for it to restart?
If you want pm me and I can walk you thru a couple of possibilities to check
I have not heard back from you so I will throw out a few possibilities.
So if it is a Rochester 2 barrel carburetor you will want to take off the fire arrester and look down the carb you will need to hold the choke open with a small screwdriver next take the throttle cable loose so you can open and close the throttle . Look down the carb and when you open the throttle you should see two nozzles spraying fuel in a strong steady stream this will confirm your accelerator pump is working in the carb. Reattach the cable Now start the engine and let it idle for a few min (remember to pull the screwdriver out that you were holding the choke open first ) then shut off the engine this next step is a little tricky and you will most likely need a gasket to replace the old one they usually tear when removed , so pull the top of the carburetor off look in the float bowl for it to be about 3/4 full of fuel there should be two jets with small brass rods going thru the center of them these are your secondary jets that provide more fuel when accelerating and power demand is high they operate off of engine vacume and are spring loaded with the engine off and no vacume they will be in the up position and should easily push down with your finger they may be sticking in the down position which will mean you are not getting the fuel needed in open throttle . If you were not getting a good stream of fuel in the first step you can check the pump plunger this should be a round blue or red rubber plunger that looks like a bathroom plunger and works the same way as a toilet plunger check it for cracks or other damage if its bad replace it they come in the carb kit that will have the upper air horn gasket you will need I like to get them from napa auto parts they have the best carb kits in my experience and there cheaper than getting them from a marina.
As some others have said water and ethanol fuel can cause these components to start to stick which makes sense.
Final thought
Remember If the engine starts up and runs at idle and will move forward in gear at idle speed but dies when you are moving the throttle forward it sounds like an accelerator pump failure so check that first the carb number on a Rochester 2 barrel I believe is on the right side of the carb or when looking at it from the front will be on your left they will also have a tag on the top to identify it .
Great White Hunter, it's been a while just what were your troubles? I am sure all would like to know.
Gene
I'd like to thank every one for the advice. I ended up cleaning the carb good, turned up the idle a fuzz and put in some dry gas. Took it out today and ran great!
Great! sorry about the super long reply but I get little passionate about Auto & Boat Repair