Ok water pump belt broke didn’t know it until I saw smoke and temp gauge pegged …

I took it home and did following ..

changed the oil and filter , changed all the spark plugs and ignition coil. Installed block off plate and added new electric fuel pump and changed fuel filter/water separator …


boat will start fine , idle fine, rev fine while in neutral . BUT when it’s in the water and I try and accelerate it sputters and misses …

It is a 454bbc

should I check carb? compression??

Oil pressure shows over 40.. fuel pressure is staying around 3 psi. Oil looks good too..

your fuel pressure is less than half of what you need

Even at idle ? It was showing that low with mechanical pump also

I’ve replaced lines ,filters and checked fitting going to tank . Could it be something in carb

Except the mechanical pump pushed more as the rpm increased.....

Also where did you mount electrical pump?? they like to to push, they dont pull well.

The way it is wired . It pulls from tank through mounted filter then pushes to carb . Should I re route to pull directly from tank and push through mounted filter to carb

I’ve seen people use the pump on big carb trucks so I figured it would work for this

Fuel psi not enough. 5-8 is good.

I’ve worked on many engines, including marine, that ate a headgasket over heating. If bad enough can warp surfaces. Sometimes create a trough between cylinders. I’d do a compression test.