Mariner 15 2s problems

[Tommy c]

I've had worse

[Trello]

Originally Posted by Tommy c

I've had worse

That is some serious crud!

[Trello]

Originally Posted by lew198

Right now I’m thinking it was clogged jets, there was honestly so much crap in the carb and around the jets I’m shocked it ran at all!

There's no doubt that if you open up the carb and find crud in it, then giving it a good clean is a sensible thing to do.

But IF neil.mccrirrick,

Originally Posted by neil.mccrirrick

On the later model the hose connects to the manifold and provides crankcase pressure. It’s under the carb when it’s on so hard to see

and I,

Originally Posted by Trello

it could be an impulse line from the crankcase to power a diaphragm fuel pump in the carb. That would also make sense with the symptoms you're getting - it might have popped off after the first two minutes, starving your engine of fuel.

are correct, and the mystery tube IS to provide crankcase impulse pressure for the fuel pump, and IF you are right in saying that you think the tube was not attached to anything,

Originally Posted by lew198

I did just discover this pipe disconnected Attachment 143006

then you will have to find where the tube attaches to the crankcase and reconnect it, since the changes in pressure in this tube are what allow the fuel pump diaphragm to move to and fro and actually pump the fuel. Without the tube connected, it won't matter how good the condition of your diaphragm:

Originally Posted by lew198

I just stripped the fuel pump and it all seemed good! Diaphragm had no pin holes or tears.

.


(Wow - that was a lot of quotes).

[lew198]

Originally Posted by Trello

There's no doubt that if you open up the carb and find crud in it, then giving it a good clean is a sensible thing to do.

But IF neil.mccrirrick,



and I,



are correct, and the mystery tube IS to provide crankcase impulse pressure for the fuel pump, and IF you are right in saying that you think the tube was not attached to anything,



then you will have to find where the tube attaches to the crankcase and reconnect it, since the changes in pressure in this tube are what allow the fuel pump diaphragm to move to and fro and actually pump the fuel. Without the tube connected, it won't matter how good the condition of your diaphragm:

.


(Wow - that was a lot of quotes).

Thanks for your input! Agreed that it could have been an easily overlooked vital part, but after stripping the carb, it seems to be just a breather/ overflow in the top of the float chamber

[Trello]

Well that's interesting. Thanks for getting back with that information.

Have you had a chance to try the motor again since you cleaned the carb?