50 mercury hp no start

[scook]

Hey Step - I’m not an outboard guy, but I do have a lot of stuff with carburetors. To check if that guy’s needle comment MIGHT be correct (could also be a plugged passage or jet in the carb), and you can drop the float bowl, if there’s gas in the bowl, you’re probably getting gas to the carb(s).

That would be after checking the fuel line like Phat said and being sure you’re getting good fuel flow past the filter. For that, I’d test it by pulling the fuel line off the gas tank and motor and putting some air pressure in the tank end to see if the flow is good. Pretty gentle pressure should send a good flow.

My $.02 worth.

[steplift20]

The problem with removing the bowl is if I do than to reseat it with the gasket is very hard u less you remove the carbs,and I don’t want to do that. Only last resort. But if I hold 5he bowl in place and back off the screw holding it ,gas should leak out through the screw hole. Right?

[phatdaddy]

yes

[steplift20]

I disconnected the fuel line going to the carbs,I blew air through it and the bottom carb blew gas out of it but not the top carb. I did get it started and seems good. I shot carb cleaner through the carbs while running. And she ran for a l9ng time till I shut it. Now ,will she start tomorrow? I will let you know. If she starts then I think she is good. I***8217;m hoping it will be good
Scook I did what you said with the air. So far so good.***55357;***56842;

[scook]

Ah, genius - how did I not mention carb cleaner? Hope problem is solved.

[steplift20]

I’m going to start it today and keeping my fingers crossed. She starts. I will post it here how it went.

[steplift20]

No good. It started on the first try Great, then it stalled out and didn’t start again. But I noticed that the primer bulb is rock hard ,so there is no gas flowing to the carbs, is 5here @nything that I can do without removing the carbs? What to look for.

[phatdaddy]

I m confused. U disconnected fuel line at carbs and blew air toward tank. When u did this fuel came out of bottom carb. How did the air get to carbs if u disconnected the fuel lines to them?

[steplift20]

No ,I disconnected the fuel line from the inline filter and blew air in the line going to the carbs, the bottom carb blew air and gas out the top carb did not. But yesterday it ran great so today I started it and she started on 5he first try,then stalled out and could not restart it unless I put carb cleaner into the top carb,than it started but stalled so I think the problem is with fuel getting to the carbs. I think what I’m go8ng to do next is remove the fuel lines (. It may) and replace it with new fuel lines. I don’t know much about carbs so I will leave them alone but check the lines. What do you think?

[scook]

Again, not an outboard guy, but I would unhook the fuel line at the tank and at the carbs and blow air from the tank end through the whole fuel line/filter system. That way you know that fuel is getting there. Not blowing very hard, so you get as close to an actual conditions test as you can. If the fuel line(s) look crumbly or swollen on the inside, definitely replace all of them. If they’re at all crumbly, a chunk of the line could be in the carb(s) intermittently blocking flow.

With the fuel lines off the carbs, can you squirt some carb cleaner pretty hard in the fuel inlet on each carb? That should have some chance of freeing up a stick float needle and possibly clearing other passages.

If that fails maybe check to see if SpareParts would be willing to rebuild the carbs if you sent them to him?

That’s my best shot at it. There may be some diagnostic YouTube videos that could help, but it really does sound like something in the carburation is plugging up.