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  1999 90 h.p. merc. Stalling out at slow speeds

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Author Topic:   1999 90 h.p. merc. Stalling out at slow speeds
Hugh Williams posted 06-09-2003 03:01 PM ET (US)   Profile for Hugh Williams   Send Email to Hugh Williams  
I have recently had my engine serviced by local whaler dealer and I have always had a little problem getting gas to the engine at slow speed but it has gotten much worse. I have to pump the ball on the gas hose once every couple min. if I am at idle why is this? It is starting to make me go mad!
Also greese is dripping onto the splashwell. I have wiped off excess gress arond the steering cable but continues to make a big mess. I know many have of you have had oil leaking when engine is trimmed up but this is different. It does not matter if it is trimmed up or down I have tried them both, and even mid way! and it is greese
Thanks HW
pamlico posted 06-09-2003 04:31 PM ET (US)     Profile for pamlico  Send Email to pamlico     
Is this a EFI engine or does it have carbs? Does the engine stall out on you at slow idle speed?
Hugh Williams posted 06-09-2003 05:01 PM ET (US)     Profile for Hugh Williams  Send Email to Hugh Williams     
It is a carb and it stall out between idle and around 2000rpm's. If you pump it it works just fine.
pamlico posted 06-09-2003 05:27 PM ET (US)     Profile for pamlico  Send Email to pamlico     
It definitley seems to be a fuel issue. Has the fuel lines been changed latey or been re-routed in any way? Has the fuel filters been changed? Is there any kinks in your fuel lines that you can visualy see? You might have to go as far as installing a fuel vaccum/pressure gauge to determine and pin point the exact area. When you bring your Merc to WOT, have you tried to bring it back quickly to neutral? And if so, does she stall out then? Does she hesitate on quick acceleration? Im asking this to see if you might as well have a very rich running condition. I beleive that a fuel vaccum/pressure gauge will quickly pin point if theres a problem if it's coming from your fuel tank to your carbs.
lhg posted 06-09-2003 05:37 PM ET (US)     Profile for lhg    
Problem sounds like either a defective fuel pump or bad fuel primer bulb. Tempo brand fuel primer bulbs are notorious for restricting fuel flow. Try replacing the fuel bulb.
Hugh Williams posted 06-09-2003 08:20 PM ET (US)     Profile for Hugh Williams  Send Email to Hugh Williams     
It has a brand new fuel filter, the bulb has not been changed lately, I will do that tomorrow. It does not stall out after WOT to quick neutral but it does hesitate when you hammer down on the throttle from idle.
pamlico posted 06-09-2003 09:21 PM ET (US)     Profile for pamlico  Send Email to pamlico     
Start out with something simple like Ihg posted (primer bulb). If tha doesn't cure it, then go from the fuel tank to the bulb and see if there is some sort of vaccumm lock or obstruction leading from th tank to the primer bulb.
Hugh Williams posted 06-09-2003 09:48 PM ET (US)     Profile for Hugh Williams  Send Email to Hugh Williams     
Thanks I will, how about the greese dripping in splashwell?
drewc posted 06-15-2003 11:35 AM ET (US)     Profile for drewc  Send Email to drewc     
My 170 Montauk is 4 hours old, and I have a similar problem. As of yesterday, after sitting for 3 weeks in the 'up' position, the Merc (4-stroke) will turn over, but runs extremely rough and then stalls after 1-2 mins (if that long). Since the engine has such low usage and has run just fine in previous 4 hours of use, I have checked and ruled out the obvious: leaks, defective bulb, blocked filter, etc.

My symptoms appear to be the same - 'soft' bulb, repeated pumping doesn't seem to prime the system...I am wondering if the problem is on the 'other' end, ie, the carbs. How can I check for leaks there?

Also, I, too, have grease in the splashwell...I have considered this just another 'new boat' issue and have cleaned it up as it happens...anyone have any thoughts as to remedy?

Clark Roberts posted 06-15-2003 08:48 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Try positioning primer bulb so that it's vertical with output at top. This will let gravity help "seat" the plastic ball check valves and may allow complete priming. If this does not work, try a new bulb... Clark
PS> check that there is no restriction or air leak in tank pick-up tube!
Hugh Williams posted 06-15-2003 10:54 PM ET (US)     Profile for Hugh Williams  Send Email to Hugh Williams     
Good news. I went out every day this weekend and and not trouble with my engine stalling out. It was the best the engine has ever ran. I put a fuel treatment in the tank and it must have cleaned something good out because it is working great.

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