Cannot get my motor to stay running

[Laughingstill]

Hello everyone, I am new to this forum and I need a little help.
I have a 2006 Four Winns Horizon 190 with a Volvo Penta 4.3 GL-D carbureted motor. I was out on the lake and the motor quit on me. It would not start and had to be towed in. Long story short the fuel pump was bad so I replaced it. The boat fired right up, I cleaned it and put it away for 4 months.
I pulled it out the other day to get it ready and it would not start again. I checked the fuel pump again (knock off not OEM) and it had a short (imagine that). I spent the money and got an OEM replacement and now it works as advertised. Here is my issue...for some reason I cannot get the motor to start and stay running. I know about the diode in the Alt so I had it checked and it was ok. I just saw there are other diodes in the harness as well so I am going to find them and replace if needed. I also replaced the fuel pump relay as well just in case. I check my harness at the Fuel pump and I get 12v (actually around 10.6 or so) when I turn the key over so just as a trial I filled the water separator with fuel, attached it to the Fuel pump and bypassed the relay by jumping 87 to 30. The boat fired right up! While it was running I pulled he jumper and it got rough and died. Now it will not restart no matter what I do.
If I pump the gas before starting, it will try and fire then die...it will not stay running...kinda like intros out of fuel. So I put fuel in the boat...no joy.
To me it seems like the fuel pump is losing it's prime...am I on the right track (along with replacing the diodes)?
Thanks in advance for your help and sorry for the long post, this has been a three week affair .....Ron

 

[Fun Times]

Hi there, welcome to iboats!

Maybe try using an outboard fuel primer bulb and a remote fuel tank and add some extra pressure to the fuel pump to see if it will help get the engine running. You may have a sticky needle and seat inside the carb.

Did the fuel seem old, have any debris or water? New fuel filter? Ensure there is not two fuel filter O-rings stuck to the base of the filter housing.

Does the fuel pump turn on when not jumped?

 

[Laughingstill]

The fuel may be old, been in there for a few months. I did put fresh fuel in the filter so that may be it. I didn't think it was a carb issue because it ran fine while fuel was in the filter, when it ran out, it died. Is there a filter in the tank? Maybe it is clogged?

 

[Bondo]

The fuel may be old, been in there for a few months. I did put fresh fuel in the filter so that may be it. I didn't think it was a carb issue because it ran fine while fuel was in the filter, when it ran out, it died. Is there a filter in the tank? Maybe it is clogged?

Ayuh,.... Welcome Aboard,.... No filter, but a diptube, 'n anti-siphon valve that could be an issue,....

Plumb a can of fresh gas to the filter barb, 'n Try it,....
If it Runs,... ya got a tank problem,....

If it still don't, look to the fuel pump/ carb,....

 

[Laughingstill]

Thanks for the help!

 

[Laughingstill]

Well the issue is definitely below the fuel pump. I took the fuel line off the tank and stuck it in my fuel can and it fired right up and ran like a charm. I checked the gas in the tank and it does not appear to be stale but I am going to drain it anyways. BTW, to be sure I reconnected the fuel line to the tank and it died in 30 seconds or so.
Is there another place I can look specifically? Is there some type of one way valve I am missing that may be bad? I also took the vent line off the tank and that did not help and the vent is clear. Thanks again....Ron

 

[Bondo]

Well the issue is definitely below the fuel pump. I took the fuel line off the tank and stuck it in my fuel can and it fired right up and ran like a charm. I checked the gas in the tank and it does not appear to be stale but I am going to drain it anyways. BTW, to be sure I reconnected the fuel line to the tank and it died in 30 seconds or so.
Is there another place I can look specifically? Is there some type of one way valve I am missing that may be bad? I also took the vent line off the tank and that did not help and the vent is clear. Thanks again....Ron

Ayuh,... The anti-siphon valve,.... It's the hose barb fittin' at the tank,....