1986 Mercury 90hp inline 6 carburetors spitting gas

[ab59]

Well, I removed the Autoblend oil injection unit, plugged off the WP line ( don't have the gauge yet ) hooked up the fuel and the motor fired and runs. However, the upper and lowermost carbs are spitting fuel. Is this stuck floats? see clip

 

[racerone]

Clean all 3 carburetors.-----Float valves and floats have issues.

 

[merc850]

Here's the float setting, check them first to see if they're "fuel logged" - the hole that the fuel's spraying out of is the back drag vent.What is that hose that's hanging loose, for?

There are also filters in the tops of the carbs; I had them in my engine and threw them away!

 

[ab59]

first off thanks for your replies. I have another short video that I will post. By tapping on the carbs I got the floats to un-stick and it runs pretty good now but after I solve some more issues, with all the help i can get, I plan on rebuilding them and the water pump. I have been looking for a good rebuild kit with floats for this motor. I still need to solve my trim bleeding down problem and put the gauges that I have ordered back into the dash that i made. New seats go in tomorrow unless I go ahead and put carpet in too. Have a look at this clip and tell me what you think. Oh, by the way, the hose hanging loose is a water pressure line that I plugged off since the gauges I ordered won't be here for a week or so.

 

[roscoe]

the best kit to get will be the factory merc kit from a merc dealer.

 

[Faztbullet]

All you need is a 15psi gauge max reading. will be about 2-3 psi at idle and about 9-11psi at WOT

 

[ab59]

Well, the only WP gauge I could find was a 2-30 psi so I guess I got what I got. Did not see any under that psi. I seem to be having trouble finding carb kits for my 1986 90 hp inline. Ser# A903----- Nothing seems to correspond to that ser # set. I live in a very small town and there really aren't any Merc dealers near me that I know of so I have been just looking online for OEM kits and floats, but no luck yet.
Would like to get a fuel pump and full water pump kit as well. Sooner or later I will find this stuff I guess.

 

[roscoe]

what's the serial number?

 

[racerone]

ab59----You are looking in the wrong places for parts.

 

[roscoe]

parts listed below are Merc factory parts available online from dealers like CrowleyMarine.

You need 3 of these @ $55 each
REPAIR KIT-CARB 1395-51091

fuel pump Diaphragm Assembly 89031A3 $15

water pump impeller only 47-89984T4 $30
Additional gaskets and such are available separately.

Or aftermarket impeller Sierra part # 18-3017

 

[ab59]

parts listed below are Merc factory parts available online from dealers like CrowleyMarine.

You need 3 of these @ $55 each
REPAIR KIT-CARB 1395-51091

fuel pump Diaphragm Assembly 89031A3 $15

water pump impeller only 47-89984T4 $30
Additional gaskets and such are available separately.

Or aftermarket impeller Sierra part # 18-3017

Thanks for your reply--- I appreciate the part numbers, I did finally find some at marineparts.com I tried boats.com by calling them since my ser#s did not match their inventory. After being on hold for more than 20 minutes a guy finally answered and then told me that since I needed parts info someone else would have to help me and put me back on hold. When on hold a recording said that it would be a minimum of another 25 minutes so I hung up the phone and have forever crossed them off my list.
I noticed that there is a new style and an old-style fuel pump kit. I would have ordered all the parts but I need to check my fuel pump to be sure of what I have. I will use your numbers and order the parts tomorrow and hopefully get them in a few days.
Thanks again.k

 

[ab59]

For all who are giving me a hand with this, I do appreciate your time and effort. Although I have some basic mechanical ability, most of this is new to me. I have worked on merc outboards a little over the last 3 years but aside from rebuilding carbs in an old 1974 85 hp and dropping the midsection on my old 1986 115 hp inline 6, I do not have much more experience than that and I feel like I'm doing this by brail sometimes, lol.

 

[roscoe]

Brail is ok, till you smash your fingers. Don't ask.

Old style fuel pump is 3ish " long rectangular.

New style is square.

Pretty sure all the 1986 models had the old style, at least both of mine do.

good luck

 

[ab59]

While I am waiting on parts to arrive, I have installed an RPM and WP gauge. My controller has 5 wires coming out of the front of the box. I can't seem to find a schematic that identifies these wires. All I find is a general plug to the tac but not 5 wires. I am by no means proficient at wiring but can usually fumble my way through the job. Anyone know where I could find a schematic for this controller?

 

[ab59]

found what I needed to fix the wiring thanks. Was a good piece on the internet that identified the wires. Now if I can figure out what caused the main fuse to blow and knocked out the power to the starter and the trim I will pretty much have this thing ready to go Crappie fishing.