242 Did Run Good for 45 minutes-gctid811491

[cant_decide]

2005, 242, 5.7L. Just bought it. All tuned up, tank topped off. Ran good for first 45 minutes at 4000 rpms then all of sudden motor slows down/boggs and then dies. Starts up, put in gear, little throttle and dies.. Thank God for Towboat US.

When I bought boat tank had 3/4 tank. I know for sure boat sat on trailer for 2 seasons could be longer. Can't ask owner, not on this earth any longer. I did add Seafoam and Marine Sta-bil before topping off tank. Installed a drainable water fuel filter.

Bad, stale fuel? Bad fuel pump?

I am thinking of attaching an outboard fuel tank to fuel line with new fuel and test.

[Pcpete]

My knee jerk reaction is a clogged fuel filter or, if your motor has an electric fuel pump, there is an oil pressure activated switch that can go bad. When that happens, the fuel pump runs during the starting sequence, but is switched to an oil pressure activated system once the engine starts. If the switch is bad, the carb fuel bowl goes dry about the time you would put it in gear. The sensor is located above the oil filter block fittings.

[Ruffryder]

+1, good idea to meter the fuel pump while starting & after

[Vic_Stewart]

Start simple.....sat for 2 seasons? Fuel filter is easy and cheap. I'd start there and see what happens.

Fill it with fresh gasoline....NO E-10

[cant_decide]

Fuel filter is brand new.

I will drain fuel out. Fill with new fuel. Check fuel filter at carb. still not working go to oil sensors and fuel pump

[Chief_Alen]

Check the vent

[CptCrunchie]

"cant decide" post=811507 wrote:
Fuel filter is brand new.

I will drain fuel out. Fill with new fuel. Check fuel filter at carb. still not working go to oil sensors and fuel pump

Two things come to mind:

A plugged fuel line from something foreign in tank. I once cleaned a tank that someone had syphoned from and left long lengths of rubber from pulling a garden hose in and out.

As Chief said, a plugged vent.

[builderdude]

Sounds like your on the right track. It could also be a plugged fuel tank vent. To test run it briefly with the fuel fill cap removed.

[builderdude]

My first thought also, a plugged fuel tank vent. to test, run it with the fuel fill cap temporarily removed.