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Originally Posted by
vk_boomer
Well let me just start off by saying that I am have the worst time with this boat. Just 2 weeks ago I got back from Afghanistan with high hopes of having a problem free boat and shredding the water up. With much to my ad vale the first time I took it out the fuel pump took a crap. Replaced it along with the spark plugs, coil pack and fuel filter(just for s/g's). This is when the real issues started. The fuel pump I bought is OEM but it was causing the carb to flood out. So my first thought is that the needle and seat went bad. So I rebuilt the carb. After the rebuild, the carb was still flooding out. So I put a fuel regulator on it and set it to 5 to 6 psi. Now after everything is fine tuned to include fuel pressure, fuel/air mixture, float level, idle rpm and timing the boat idles great. The issue I’m having now is when I give her hell it bogs pretty bad to the point of shouting off. If I ease into it, the boat accelerates awesome and is still drivable. It just sucks pulling someone up out of the water because of the hesitation. I have checked for vacuum leaks, but nothing. The next step is playing with the squatters’ and accellarattor pumps cams. But the boat ran awesome last season without any of these adjustments. So, If anyone is running a Holley double pumper 4150 600cfm, p/n 80559 and can help or if anyone has some advice before I go this route, please chime in and help out a desperate man
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Thanks
How long was the boat sitting?
Was there much fuel in the tank and was it stabilized?
What kind of fuel pump did you replace the old one with?
The replacement should be a Carter P4389. It is max 6psi and has an internal regulating valve so you shouldn't have had to use a separate fuel regulator.
You said the carb was flooding out after you installed the new fuel pump.... Did you check to make sure everything was wired correctly? Turn the key to "ON" position and make sure the pump isn't running. It should only run while cranking the motor and while the motor is running.
Since you replaced the plugs and coil you should have done the cap & rotor as well.
When you rebuilt the carb did you shoot carb cleaner through all the passages and blow compressed air through everything to make sure no dirt was clogging anything up?
What size power valve are you using? It should be a 2.5.
Do you know what size the jets are on the primary & secondary?
I would leave the pumps cams alone.
It sounds like it's not getting enough fuel at hole shot.
Make sure the pump arm/spring for the acc pump is adjusted correctly so your getting enough gas squirted in the carb.
I would double check your float levels as well and make sure you do it on the water as it's hard to set them on the trailer.
Just sounds like you need to do a bit more tweaking to the carb to get her set up just right !!!!
'99 Outback (Maroon/Creme) GM 350/Holley 4150
550 HRS
LaSalle-Peru, IL