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| rpms stay at 3000 for a while then accelerates. https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=9128 |
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| Author: | grenna [ Mon Apr 23, 2012 12:11 pm ] |
| Post subject: | rpms stay at 3000 for a while then accelerates. |
hello guys i am new to this boating hobby. I just bought a beautiful 1996 four winds sundowner 22'. i just put it in the water Saturday and i love it. I had 2 other adults in the boat. She drives great only one issue. Once she gets to 3000rpms at full throttle it takes about 20-25 seconds to start to pick up speed. The rpms do not race and the engine does not bogg down. She just stays at the speed with the rpms at the same as they were. Its almost as if she lags a minute or so on full throttle. Any advise would be greatly appreciated. |
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| Author: | wkearney99 [ Fri Apr 27, 2012 2:06 pm ] |
| Post subject: | Re: rpms stay at 3000 for a while then accelerates. |
There are any number of reasons why fuel delivery wouldn't be proper. Start at the fuel filters, make sure they're new. First suggestion would be to replace the fuel filters. Be sure to examine whether there's any debris in them. If there is then you have issues upstream back to the tank. Then check fuel flow rate. Check it at speed, under load. Make sure it's actually delivering the right fuel pressure. Then look at the hoses. As hoses age they lose their strength. This typically results in either leaky hoses or ones that collapse under suction. The more fuel that's pulled through them the more force that's pulled inward on it. This cause the hose to collapse, further starving the engine. Most hose vendors indicate no longer than 5 years before you should consider replacing them. If it's a '96 and those are original hoses be sure to consider whether replacing them is worth doing. Might be worth temporarily running a fresh line from the tank to the pump and see if the problem goes away. Be sure to replace the filter after a job like this to be sure any old chunks of the hose are caught. Then there's the fuel pump(s). If the pump can't keep up then the engine won't get enough fuel. In neutral the engine can rev up freely because there's nothing loading it. Put a load on the engine and that takes more fuel to make the same RPMs. So if your pump isn't keeping up then the engine won't get enough fuel. |
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| Author: | fiznuka [ Fri Apr 27, 2012 8:34 pm ] |
| Post subject: | Re: rpms stay at 3000 for a while then accelerates. |
Possibly a spun prop hub. |
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