OX66 - 250 Hp - 2 stroke - starting after new fuel filter

[Grandpaw]

OX 66 , - 250 Hp - 2 stroke
OB new too me ( always owing IOs ) problems will definitely educate me on this motor

changed external fuel filter ,cleaning clear bottom bowl , Looked clean
Primary filter ,- needed changing was dirty
Primed both with little fuel
Fired up
idled on hose ,
During week started ( always water running thru ) multiple times , letting it idle , few minutes , closing - never stalling ,

Other day ran about a minute then heard that sound sputtering , starving for fuel , DIED , - Just returned from few days out of town , back too boat , WHY ? , was running , maybe I hit kill switch clip ??
Nope , it seems good ,
Damn whats going on it was running ,

1/4 tank fuel , fuel sitting both filters bottom of bowls

Removed primary fuel filter ,maybe it was not sitting properly ? , looked good , seated properly
,
When I prime filter bowl should I see fuel entering while pumping ? ,
If I removed hose prior too primary and pump should I see fuel coming thru ?? I see no fuel pumping thru ?
air in line ? tank ? vent
Previous owner had shop clean VST box ,
Will check CO 2 sensor , clean

Will check fuses
heres were I dont know enough about this engine , coils , etc

Some thoughts and help is appreciated

[DennisG01]

Can you define what you mean by "primary" fuel filter?

The on-engine fuel filter... Is there gas in there? Yes, when you pump the fuel bulb, fuel should fill that. Does it?

There is a drain screw on the VST tank... unscrew that and drain the fuel into a suitable container. How much came out? A spaghetti jar is good for this.

[Grandpaw]

FOLLOW UP
Found it
2 issues ,
I call the primary fuel filter in engine , external is fuel / water seperator
I think external fuel water seperator had gasket not sitting even , allowing air ,
Once I had it sitting even , tight , pump ball pumped fuel into primary clear canister
But think the main issue was key switch , Got under dash found loose wiring , tightened everything and starts

thanks for getting back trying too assist

[DennisG01]

Yeah, if that gasket wasn't right or the external filter wasn't screwed down enough... that could definitely do it as the bulb has to PULL fuel through the external filter, first.

[Keithbaja]

Make sure you put oil on the rubber seal on top of the water separater. W/S . same with the treads & seal on engine filter I get SO many that were not installed correctly. A vice grip chain wrench is a great tool for the tough ones.. Some times I have to remove the complete Assembly,, mount to a stainless steel plate (I made for this) and use extreme force to unscrew.... Otherwise you can tear it out/off its mounting surface easily.