[K1W1]

Originally Posted by NYCAP123

That would be evident with a cold engine as well would show most coming out of the hole and would overrev the prop, not surge the motor. I'm remembering a boat that used to come into a transient marina I dockmastered. He went through 2 rebuilt carbs and I finally refused to allow him in. Then he splurged for a new. Problem gone.

Hi,

Surely if the engine revs increase when underway the propshaft will increase at a rate the same divided by the gearbox ratio. Once the boat is in gear there should be no clutch slip so the two things are closely interlocked.

[NYCAP123]

Both spins increase together, but totally different sound and feel. The surge gives thrust whereas cavitation gives slip.

[sgswrench]

Ok, I finally fixed my boat (and boy do I feel stupid!) I isolated that fuel filter housing, I insulated the fuel pipes with some heat reflective sleeving from the napa store (and it looks pretty on my new engine) and although I change that remote filter every season, I have not replaced the carb filter. When I rebuilt the carb (as a GM tech I think this would be about my 2000th quadrajet overhaul, one more reason I wasn't buying into missing something) I figured i would go back to the fuel filter without the check valve (I put one in with the check valve to help alleviate the carb drying out after sitting a week-it didn't work anyway) weelll....... after I cut that filter open and found all the dirt packed inside.... well we went for another ride! I guess the dirt would pack itself in after a cruise and really silt into the filter at idlem and well, not flow very well. Whay a dumby. well capt., I guess I can kiss that 6 gal per hour goodbye, but my '78 catalina express 254 sure does run sweet now. Thank you all for putting up with me..

[K1W1]

Hi,

Glad you found the problem, I know how you feel, in my early years I took a few shortcuts and came unstuck, as they say and none too kindly- there isn't anything like a mechanics car.

Thanks form me and the rest of the readers for posting back the actual solution, a lot of people don't. :-)

[Seafarer]

Originally Posted by K1W1

Hi,

Glad you found the problem, I know how you feel, in my early years I took a few shortcuts and came unstuck, as they say and none too kindly- there isn't anything like a mechanics car.

Thanks form me and the rest of the readers for posting back the actual solution, a lot of people don't. :-)

^^ K1W1 said it best... in complete agreement.

[NYCAP123]

Hey, you got it figured out just in time for the true start to summer, July 4th. Have a great summer.