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Fuel pump
aero3113
Member Posts: 8,797 ✭✭✭✭✭
My 2001 242 is new to me, we bought it last year and had a great season. There is a issue that I have with the fuel pump, if I turn the key to the on position the pump constantly runs ( am I right that this is not supposed to happen?) The pump doesn't run in the accessory position and starts normal.
2008 330EC
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Steve and the Rinker/Merc guys might know better but if the pump continues to run at the "on" position before the key is turned to "start" it may not be holding pressure like it should. I believe my FI pump on my car engine only runs on demand as the pressure lowers after the engine starts.
Just like your car, I don't leave the key in the "on" position if I'm tailgating with my sound system on for instance. You're right that the engine won't be energized in the Acc position and the pump can't run in that position.
Glad you're enjoying your boat and have a great season, Mike
Here's a couple of youtube links that might be helpful re Fuel pumps for FI engines and how to test them:
http://www.youtube.com/watch?feature=player_detailpage&v=QbzEeWy1b3o#t=67s
http://www.youtube.com/watch?feature=player_detailpage&v=aITQclp7zIE#t=42s
http://www.youtube.com/watch?feature=player_detailpage&v=ia0xFQH5kTg#t=7s
I have been an automotive mechanic for 30 years. On most G.M. fuel injected vehicles the PCM (computer) will energize the pump for aprox 2 seconds when the key is first turned to the on position. Once the computer sees oil pressure, the pump runs constantly. Although boats may be wired differently, and the earlier answer you received may be correct. That being said, I would turn your key to the on position with the engine off and see if you are showing oil pressure on your gauge, if so replace the oil pressure sending. Just my 2 cents worth. Next time I get in my boat I'll see if my pump runs all the time with the engine off.
Hope this helps.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
Glad to have you on the forum sharing your experience. My 2003 Suburban 2500 tow mule will be needing your insight too I'm sure. It wouldn't make it far if it totally depended on mine.
Boomer, Those links were straight from youtube so it must be an internal setting for your browser that wants to use RP....I think. Hey, I'm using FF too, it solved the typing issue. The site is coming together.
=D>
Sorry my mistake, I thought you had a throttle body fuel injected engine. And I assumed it is a G.M. engine, (5.0L, 5.7L, or 7.4L). I'm surprised that a carbed engine would have an electric fuel pump in the first place. All the factory equipped carbed engines I have seen, whether it be in a marine application or automotive, have all used mechanical fuel pumps, but yours is a newer year model than what we typically see with carbs so it may be different . Could it be that someone added an electric pump? Either way, I don't see why it would run constantly, without a return line (as most carbs do not have) the pump should shut off as soon as the carburetor bowl is full and the needle and seat close, and the come in spurts as the engine is running.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
Hope this helps,
Bruce