35hp merc running out of gas

[kenny40391]

i have a 1985 35hp mercury ran fine last week till starter went out i replaced starter now it runs till it empty's the carb. bowl then dies. pump up the bulb and it runs for a minute or two then dies.pump up the bulb again and it repeats. i installed a new fuel pump kit and it is still doing the same thing. any sugestions? am i missing something? thanks kenny

 

[kenny40391]

Re: 35hp merc running out of gas

ok today i have run a compression check . it has 150lbs per cylinder. removed and checked the fuel pump again to make sure i had everything right. soaped up the entire engine looking for a gasket leak while it was running. still cant figure it out im lost.. help

 

[Mi duckdown]

Re: 35hp merc running out of gas

Did you rebuild the carb? if not. i would. your float may not be set properly also, or water/gas logged.

 

[Sunfish12]

Re: 35hp merc running out of gas

You need to disconnect the fuel line going into the carb. Pull your sparkplug wires then crank engine to see if you have a constant flow of fuel.

 

[kenny40391]

Re: 35hp merc running out of gas

i can squeeze the fuel bulb start the engine and pull the fuel line coming from the pump to the carb with the engine running and its just got a spitting of gas not a stream. a spurt or two here and there. the motor was running great till i installed a new starter. i know it dont have anything to do with it but im stumped.. local boat shop said to remove the fuel pump and check for air pressure from the crank case thats the only thing i havent done yet.

 

[jeffersondodson561]

Re: 35hp merc running out of gas

Could be your primer bulb, if you have a remote tank with seperate line and bulb that would eliminate it. Perhaps a severe air leak. If you have a boat with a permanent fuel tank check the vent line; muddobbers? You can hook up a fuel vacuum line and check fuel restriction. No more than 4"hg.

 

[Maxz695]

Re: 35hp merc running out of gas

if all eles fails you can buy a 6 LB electric fuel pump but theat would be defeating the issue does your water line run throught he fuel pump and if so is the pisser doing the tall tail thinggy? do you have a fuel filter on this line if so replace it. check valves may be gone in the fuel pump but not likely.

 

[Sunfish12]

Re: 35hp merc running out of gas

You could have a bad air leak as mentioned. It would most likely be before your primer ball. try the seperate tank and ball. If that doesn't work you probably have low vac on the pump.