Still having fuel problems on 75 merc 8500

[tompowers85]

I am not getting enough fuel in the engine. When i start the engine i have to give it full throttle to keep it running (and then it barly idles), and if i prime the bulb it revs the engine to were it should be with the throttle that high. When the engine is off after running it, if i prime the bulb, the carbs start spraying fuel out of the top vent at the bowl. I have replaced the needle valves and seats, floats, fuel pump gaskets, all hoses and gaskets. Can anyone help me please this engine is driving me crazy. I am about ready to buy a big sledge!

 

[rabidfish]

Re: Still having fuel problems on 75 merc 8500

Sounds like you are getting too much fuel...<br /><br />I would try Home Depot or Lowes for the sledge.

 

[Bob H.]

Re: Still having fuel problems on 75 merc 8500

It sounds like a restriction to the carbs. It doesn't take much. Does it run off of a spare tank? Did you change the fuel pump diaphram (you only mentioned gaskets)and the fuel filter on the engine? When you split the carbs did you remove the welsh plugs and clean all orifices?

 

[tompowers85]

Re: Still having fuel problems on 75 merc 8500

I replaced the diaphram 2x's and i completely rebuilt the carbs. I took out the welsh and everything, and blew it out with compressed air.