Re: 1981 200hp Not getting Fuel, need help.
Ok, ............................... new line in my fuel tank, ............................ once it’s running wide open down the river, usually about a minute later it starts idling back and wanting to cut off. ...............................................
Do you mean the 'dip tube' in the fuel tank?
Have you also checked the anti-siphon fitting on top of the tank?
Either of these can cause a restriction in fuel flow that will not allow enough fuel for WOT.
The symptoms you describe are classic of a slightly restricted fuel flow, the motor can only run at sustained speed at that limited flow.
Some yr/model fuel pumps were not physically bolted to the crankcase and use a 'hose' to transfer the pressure/vacuum pulses, when that hose ages, weakens, that will also limit pump capacity.
Too tight a zip tie on a fuel hose/wiring harness can restrict fuel flow, as can too tight of bend in a hose.
Large HP motors require large fuel flow, you have to verify every fitting, every hose from initial pick up in the tank all the way to the carbs, or you risk running lean at WOT and hurting your motor.
Aftermarket primer bulbs and quick disconnect fuel fittings are often suspect. Many shops and owners absolutely refuse to allow them and insist on Merc fittings, or eliminate the fittings altogether and run straight hose to and from the tank, primer, fuel pump.
