OMC 5.0 wont stay primed after new seperator. PLEASE HELP

[Car1is]

Boat was running fine until what I thought was bad gas put in it. New low pressure pump, because i thought it was bad, new water seperator because l thought I'd picked up bad gas from bottom when it refused to idle after new fuel pump. Drained/cleaned tank, and changed separator, new fuel, and now it will only run if I pull off separator, dump the gas, and put it back on. Filter is never full when I pull it off like before. But it'll only go past 2k rpm in neutral. Any thoughts?

 

[itsathepete]

Have your checked the antisiphon valve. It could be blocked, not allowing sufficient fuel flow and also allowing fuel to drain back into the tank

 

[Car1is]

Have your checked the antisiphon valve. It could be blocked, not allowing sufficient fuel flow and also allowing fuel to drain back into the tank

Where could I locate the anti siphon valve? Is it part of the seperator and pump assembly

 

[itsathepete]

it is built into the fuel pickup from the tank

 

[Grub54891]

The anti syphon valve is on the fuel tank, where the fuel line hooks to the tank. It basicly looks like a hose nipple but it has a check valve in it to prevent the fuel from syphoning if there is a leak. Do not disguard it, it's a coast guard regulation to have it. Either clean it or replace it.