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TOPIC: Stalling history so far

Stalling history so far 27 Jan 2016 20:10 #1

  • kennyb93
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'98 2452 Ciera, 5.0 Merc W/Alpha 1

Cruised down to Salmon Bay from Everett on full tank, no prob.
Low speed (7kn) stalling a few times, no prob starting it up. replaced sensor on distributor & slave coil.
All this time, it starts & idles fine, now down to 1/2 tank of gas.
No low speed stalling all the way from Salmon Bay out to Lake Washington. Open it up to 25kn, doing fine till I reach Juanita, then cuts out. Starts back up just fine, but continually loses power till I run it at 2kn.
Replace electronic ignition & fuel pressure sensor. Runs solid at 25kn for an hour, then starts cutting out again, same routine: Start, try to bring up speed, falters, limp back at 2-5kn.

Water in the tank? Before we left Everett I had it tuned up & replaced exhaust maniflolds. Should I put some additive in the tank & take it out again?

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Stalling history so far 27 Jan 2016 20:17 #2

  • canoel
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It sounds like the tank vent may be plugged. It is very common. Try leaving the fuel tank filler cap loose, or try loosening it when the problem occurs.
Fuel filter new?
Maybe also the pickup in the tank has a hole in it, or possibly water in fuel, but unlikely because it runs fine for a while.
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Joel
1987 3818 Hino 175
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Stalling history so far 27 Jan 2016 20:32 #3

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New fuel filter, yes.

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Stalling history so far 27 Jan 2016 21:56 #4

  • builderdude
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canoel wrote: It sounds like the tank vent may be plugged. It is very common. Try leaving the fuel tank filler cap loose.

+1
That's where I'd start.
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Stalling history so far 27 Jan 2016 22:33 #5

  • Nauti Mike
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kennyb93 wrote: New fuel filter, yes.


No what they are saying is the fuel thank has a vent on the outside of the hull and it is most likely clogged, bugs. I agree with them.
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1997 Maxum 2400 SCR 5.7LX Bravo II

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Stalling history so far 27 Jan 2016 22:53 #6

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Yes, "canoel" asked if the fuel filter is new which it is. But now I have a new lead on this problem, thanks!

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Stalling history so far 27 Jan 2016 23:10 #7

  • kennyb93
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I'm guessing that running with the tank filler cap loose, one would find out yes or no, but the hose would need a proper cleaning wouldn't it?

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Stalling history so far 27 Jan 2016 23:27 #8

  • canoel
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Yes exactly. As fuel is used in the tank and the level goes down, air must be allowed in. If the vent plugs you get a vacuum situation.

I would run the boat with the filler cap on and wait for the problem to appear, then remove or loosen the cap. If plugged the boat should run much better and you may hear the air rushing into the tank as you open it.

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Joel
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Stalling history so far 28 Jan 2016 02:18 #9

  • Chief Alen
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All of the above can be true, also it could be gunk and junk in the tank, maybe water too.

So this is your setup at the bottom of the post ....

Starting at your tank " best on a trailer or on the hard " remove the vent hose, using compressed regulated air blow thru the vent hose towards the vent fitting on the transom, with someone watching the fitting.

The fitting of course should not be corroded closed or the screen blocked if it has one.

See if something comes shooting out, fuel would indicate, a loop in the hose that's a bad thing.

Now remove the fuel pickup tube and anti-syphin valve all in one unit.

Make sure if there is a screen on the bottom of the tube is clear and the anti-syphin valve is not clogged and working good.

Now suck all the junk and gunk ioff the bottom of the tank into a snapple glass jar, or any other GLASS jar, till the fuel is clear entering the jar.

Let sit for a while and see if there is water in the fuel. The water will be on the bottom of the fuel.

Next follow the hose to the fuel filter, there will be a 90 degree fitting, that can get clogged, the other fitting that turns the steel line to the fuel pump can get clogged. # 11

Water in the fuel is bad for the electric fuel pump.

Now remove the fitting that enters the carb, there will be a screen in the fitting make sure it's clean. Blow air thru all the sections of the steel tubes, and then reassemble.

Now you have a clean system.

Oh change out the fuel water sep, dump the contents into a clean glass jar.

Post back if the boat has lost the stalling issue.

www.marineengine.com/parts/mercruiser-st...pump-and-fuel-filter


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Be good, be happy, for tomorrow is promised to no man !

1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

'86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !
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Stalling history so far 03 Feb 2016 00:46 #10

  • rkcarguy
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Some kind of bug LOVES nesting in fuel vents! My 2nd year of owning my current boat, I de-winterized my boat and was doing a test run on the hard when it started bogging down like it was running out of fuel then died. Started right up again and then the same thing with the frequency of the stalling getting quicker and quicker. Looking over everything I popped the fuel fill cap because I'd hear of this before and whoosh.....major vacuum in there. Vent was plugged full of little black beetle looking things and this fine white nest/web looking stuff. Blew it out with the air and it was all good.
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Stalling history so far 03 Feb 2016 22:59 #11

  • Ion66
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I expected something Russian when I read a history of Stalin.

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1996 2252 LS Capri Cuddy Cabin. Merc. 5.7L . Port Perry, Ontario, Canada.

Stalling history so far 04 Feb 2016 20:03 #12

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Good one!

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