Fuel injectors

[Tom C]

I put E-15 in a 1998 7.4 EFI, by accident, so I added some Lucas Ethanol Stabilizer, boat was running very rough. Pumped all the gas out and replaced with non-Ethanol gas and replaced WaterFilter canister. Now it starts fine , idles good but won’t get over 2300 rpm under load, barely enough to plane. I know there is another filter on the fuel regulator……very difficult to access. There was no water in the separator filter and no problems with the filter on the pump I used to drain the tank, So I’m thinking on starting with checking the fuel injectors

 

[Dieter]

I put E-15 in a 1998 7.4 EFI, by accident, so I added some Lucas Ethanol Stabilizer, boat was running very rough. Pumped all the gas out and replaced with non-Ethanol gas and replaced WaterFilter canister. Now it starts fine , idles good but won’t get over 2300 rpm under load, barely enough to plane. I know there is another filter on the fuel regulator……very difficult to access. There was no water in the separator filter and no problems with the filter on the pump I used to drain the tank, So I’m thinking on starting with checking the fuel injectors

I suspect that you have something else going on other than the E15, unless you left the E15 in it for a long time. If there was no water or debris in the fuel filter (or phase separation) you likely have another issue.

Is the ignition system in good shape? check with spark gap tester and can you measure fuel pressure .

 

[AllDodge]

Suggest compression test