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You have water in your gas.

I'm pretty sure that the item in Red is the secondary(high pressure fuel pump). To avoid vapor lock, there is a low pressure pump on the engine which feeds the high pressure electric pump. One line...

I bought mine from Rinda Technologies. They have good support also.

Unfortunately OBD scanner won’t work. Boats use the MEFI ECM. You can buy a scanner ($500 ) or a simple code reader ($60.00).

First thing I would check was the v-belt. I’ve never heard a fuel pump squeal under load, but a belt will definitely do that. Not sure if it’s original , but the boat is 23 years old. Next thing I...

Carb, throttle body injection or multi port injection?

Great news. Glad you’re back in action.

Nope. Hardware store brand. Make sure both surfaces are clean. I used a little Acetone when I put my new pad on to clean everything.

St. Louis. I don’t do side work anymore though. If you had dual batteries, they would be mounted next to each other.

In your other post, the boat was sluggish but started fine. Now that you’ve changed plugs and wires it won’t even crank. You could put 8 different kinds of spark plugs in and mix up all the spark...

I would use contact cement.

I don't think the fuel pump and ignition are on the same circuit. Power goes to the fuel pump relay when you hit the key. There is also a relay for the ignition circuit and the starter.
They are...

Sounds like you have some serious positive/negative connection issues. If you battery cable keeps coming loose, something is wrong there. I would also check all the grounding connections. After...

Its interesting that it was OK last season. Fuel filter can't hurt, especially if its never been changed but I would retrace what you did during de-winterizing. If they pulled the spark plugs and...

Sounds to me like the mechanic didn’t disconnect all the power when removing the starter. Probably blew a fuse or two. They may left something off or loose and that’s what your rattle is. Take it...

No pics, sorry. In the engine compartment.

Disconnect the plug under the hatch where it connects to the cruise actuator. Or, find the fuse and pull that.

I definitely agree with other members that it is ignition related. You might want to pull the cap and inspect the shaft play on the distributor. I'm not sure what setup you have for ignition, but...

Check out a video on YouTube called
“GM FUEL PUMP RELAY TESTING “. It about. 30 minute video and describes in detail the biased voltage produced by the ECM. 12 volts with a test light plugged in to...

Check out this schematic- MEFI relay circuit. I beleive this is the "FROM SYSTEM RELAY" you mentioned.29797

29795
Here is a copy of the circuit diagram. It should be the same as your boat. There is a procedure for diagnosing, but it requires a scan tool. Maybe the schematic can help you at least trace...

I have a service/ diagnostic manual for the MEFI 4 system. In it, it states that when the key is first turned on you should have fuel pump run 2 seconds. The ECM sends a signal directly to the fuel...

Have you checked for any stored codes? What did your fuel pressure gauge read when you changed the regulator? This is the perfect example as to why I bought a scan tool. Its usually a whole lot...

My boat is older, but when I removed the interior panels in my rear ski locker for cleaning, I found the pump/reservoir behind the back panel(closest to rear of the boat).

Temperature sensor will keep it from passing 3000 RPM if the sensor is bad, going bad or poor connection. Its part of the programming know as EFI phased warm-up. Its keeps you from running at...