Fuel Problem

ritzlimo

Cadet
Joined
Dec 11, 2004
Messages
10
I have a 1989 Mercury 35hp oil injected outboard. Every time I switched tanks, it would take forever to get the engine started again. This season, I replaced both tanks and all the lines and connectors. I went from the old long connectors on the tanks that you had to push in and turn, to the new Yamaha/Mercury connectors like the one on the motor. <br /><br />I have been having a lot of trouble getting it started from this point. There is fuel to the connector going into the motor, but it will not start. If I use starting fluid, it will run fine till the fluid is gone. Is there a fuel pump on these motors? Could this be the problem or should I be looking at something else. I am getting so frusterated!!!<br /><br />I did have it running on shore after a while (using the muff and garden house of course) and it would start each time. When I put it in the water, it started right up and ran for a few minutes then died, and now it will not start unless I use the starting fluid.<br /><br />Thanks in advance for any help you can offer.
 

ritzlimo

Cadet
Joined
Dec 11, 2004
Messages
10
Re: Fuel Problem

Where would the fuel pump be located in reference to where the fuel line plugs into the motor? Quick ? If I had a bad spark, would the motor still run with the starting fluid? Thanks for the help!
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Fuel Problem

First, stop using starting fluid. It doesn't contain any lubricant. Use a fuel/oil mix in a squirt bottle. Make sure you have good spark. If spark is ok, pull the fuel input line off the fuel pump and stick it into an empty bottle. Squeeze the primer bulb. If you have no fuel flow, you have a connector mismatch or there is a restriction in the line somewhere. If you have fuel flow, reconnect the line. Remove the fuel line at the output side of the pump. Attach a short piece of fuel line and put the other end in a bottle and spin the engine over to check flow. No flow = bad pump. Good flow = good pump. If fuel flow is ok at this point, you have a carb issue. Stuck inlet needle, gummed up carb, etc. Probably time for a carb rebuild.
 

ritzlimo

Cadet
Joined
Dec 11, 2004
Messages
10
Re: Fuel Problem

One more question, is there an inline fuel filter in the motor? I see what looks like a fuel filter on what would be your right side if you were facing the motor from behind the boat.
 
Top