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disconnected fuel line and engine runs rough ?why
|Author||Topic: disconnected fuel line and engine runs rough ?why|
posted 05-16-2004 08:37 PM ET (US)
I just bought a 1985 newport (to go with my 1978 sport - even numbers more stable) It has the brown striped 1985 mercury 90 Hp tower of power. Yesterday it was perfect; smooth at idle, break your neck power, 5500 rpms without effort. Skied with a friend for an hour. Last night I disconnected the fuel line at the motor because I leave it at my dock and wouldn't want 24 gallons of 50:1 (walmart tcw3) to siphon from the pate into the pond. I wish I had just turned the little valve in the line, because the beast wouldnt idle without dying,ran rough, had a very slightly weaker stream and had no power at 4000 rpm max throttle. I brought her back to dock thinking maybe the disconnecting and connecting with squeezing the bulb got air in the line? Are these motors sensitive to that? Do I need to bleed it somewhere ? Will waiting alone help? The motor compression tested 140-146 all six cylinders last week. I cracked the tank lid to be sure it wasnt a vacume problem. It did rain alot last night but the lid was on tight and the fuel line wasnt in any water. Any ideas would be appreciated as I'm pretty new to mercury engines.
posted 05-16-2004 10:19 PM ET (US)
If your boat doesn't have a water/fuel separator now, you would be wise to add one. My merc had several episodes of lost power at WOT due to water getting into carb bowls (even with separator)-this does not sound like your problem, maybe replace the fuel line assembly if it's old (including bulb)
posted 05-17-2004 10:30 AM ET (US)
I don't understand why you disconnected it it. Why would
it siphon into the pond if you left it connected? Just leave
it hooked up.
It's not just air in the line from connecting and disconnecting.
My guess is that you are getting an air leak at the QD. I
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