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TOPIC: 1977 Merc 1150 Carb & Fuel Pump Rebuild Kits

1977 Merc 1150 Carb & Fuel Pump Rebuild Kits 6 years 8 months ago #132795

I am going to rebuild the carbs including the floats as well as the fuel pump on my 1977 1150 S#4689451. I have the parts & service manuals but I can't figure out exactly what I need.

I want to buy the correct kits and there seem to be numerous options. Can someone give me the correct part #'s to purchase for

1. Carbs
2. Floats
3. Fuel Pump

Thanks,

Kevin

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1977 Merc 1150 Carb & Fuel Pump Rebuild Kits 6 years 8 months ago #132805

  • ed-mc
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These should be your carb parts:

www.marineengine.com/parts/mercury-outboard-parts/1150/3525441-thru-4855152-usa/carb-usa-3761034-aus-8014004-canada-7025597-and-below

Floats are part #2 in the diagram, I'd also recommend replacing the fuel inlet needle & seat in each carb (#6 in the diagram).

Typically all the gaskets you'd need to reassemble the carbs are in the 1399-3523 Gasket Set, towards the bottom of the page.

Fuel pump parts for the old-style multiple pumps:

fiberglassics.com/forum/main-forum/131189-1977-merc-1150-carb-fuel-pump-rebuild-kits.html#132795

Unless your check valves are shot, all you should need is a diaphragm kit for each pump:

www.marineengine.com/newparts/part_details.php?pnum=MER55278A+1

On the off-chance you have a single fuel pump, here are those parts:

www.marineengine.com/parts/mercury-outboard-parts/1150/3525441-thru-4855152-usa/fuel-pump-usa-3761035-aus-8014005-canada-7025598-and-up

BTW if you should happen to have a brass jet in the float bowl cover, those are known as "vent jets" and per Mercury TSB should be removed. This is part of the "Back Drag" system which leans out the mixture at mid-throttle, for better fuel economy. Unfortunately, this led to burnt pistons from too-lean mixture on a lot of Inlines. Plug the hose where it connects to the carb. Some mechanics stuff a BB in the hose and then hook it back up, which seals the system quite securely. What you don't want is to leave the carb-end disconnected, as it'll cause a vacuum leak. Check out the inset diagram of the float bowl cover on this page; the jet is #11 in the diag and the hose is #12.

HTH.........ed
The following user(s) said Thank You: kck8385

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1977 Merc 1150 Carb & Fuel Pump Rebuild Kits 6 years 8 months ago #132814

Ed,

Thank you for the information. A couple of things.

1. I apologize that this is posted in the Main forum. I meant to post it in the Mercury forum. If a moderator would move it I would appreciate it.

2. Per my post my serial number S#4689451 so I will see verify the parts for my serial number.

3. I do have the single fuel pump.

4. I put a BB in the Back Drag hoses a while back and hooked them back up.

Again if a moderator would move this to the Mercury forum I would appreciate it.

Kevin

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