Rayson Craft Pontiac engine Trouble

[azduster]

I have a 1964 17' Rayson Craft V-Drive with a stock pontiac 455. The motor has about 10 hours on it. The problem I am having is after accelerating and running at mid range the motor bogs down, (like its running out of gas), after I slow downit will accelerate fine and then repeat the same thing. If I accelerate slow and runat a slow speed the boat will run fine. If I accelerate quickly and stay in the throttle it will bog quickly. Also I can accelerate slowly into a higher range for a while before it will bog.
Things I've done
New fuel pump
New Steel fuel lines
Rebuild Quadrajet Carburetor
New fuel Regulator
Change coil
New ppoints and condenser
Checked timing
Replaced gas filter
Any suggestions or help would be greatly appreciated.

[obnoxious001]

Are your fuel tanks vented, either the caps or separate vent? If you have checked all the other,, I bet that might be it. The other thing to check is to make sure there is not debris in the tanks that may plug the fuel pickup.

[coolchange]

Ya what he ^^^^^ said.
<<<<<65 Rayson with 389 GTO

[azduster]

Thanks for the suggestion. I will try it first thing in the morning and I'm sure the neighbors will love me.
I'm not sure if it is vented but I am thinking I can leave the fuel cap open to check it.

[SnoC653]

Double check the ruber hoses before the pump. If there is air being sucked in it will do that or if the line is collapsing it will do that.

[GofastRacer]

If I accelerate quickly and stay in the throttle it will bog quickly
Now this sounds like a restriction more than a vent problem(not that it isn't), what size lines do you have??, since you have a quadrajunk did you remove the bronze filter in the inlet??. Also check for air leaks throughout the system!..

[Lefty]

Do you have fiberglass tanks? My boat used to do this the glass tanks were coming a part from the inside and would clog the filters. If your tanks are the original glass tanks I would bet that would be it.

[GofastRacer]

Yep, that's another possibility had that happen in my Stevens with glass tanks!..

[Moneypitt]

Has this combination ran before? If it did, what did you change? If not, and you just got into this deal, what is the fuel system plumbing? Are you feeding from both tanks to a single pump? Gravity feed out the bottom or sucking over the top?.........If you're drawing from two 3/8ths lines into one 3/8ths line you could have a vacuum drop that won't pull fuel up and over. Try a remote tank,(a 5 gal can SAFELY plumbed in) one line to the pump......If the problem continues you can discount the tanks/plumbing. If it is cured, you will know where to look..........MP

[DansBlown73Nordic]

a 5 gal can SAFELY plumbed in???? Would that be a can with a hose bungie corded to the back of the seat?????:D :D :D

[azduster]

Thanks again for the help, Heres where I am at. Tried running with tank caps open, No change. SAFELY attatched a 5 gallon gas container to my sons hands and ran a line straight to the fuel pump, yeehaa runs great!!!!! next I hooked the line from the 5 gallon container to the on/off valve or right side left side valve and everything still works great, So next I am going to check where the lines feed into the tanks (top feed) and look for air leaks Good connections, They are aluminum tanks. update later today
Thanks again:)

[Moneypitt]

a 5 gal can SAFELY plumbed in???? Would that be a can with a hose bungie corded to the back of the seat?????:D :D :D
Ah, yeah.........worked........Now he at least knows where to look......I didn't mean make a dam to dam run, just see if it made a difference, and it did...MP

[shirkey4750]

My Howard GN had the same problem. It had fiberglass tanks also. Cut the top open and found that the baffle had broken lose and was sliding back under the pickup on acceleration, causing it to starve for fuel.

[azduster]

After checking all the lines and connections I pulled the tanks from the boat. I had previously pulled and cleaned the tanks but did not check the pick up lines. They are top feed tubes (welded in) and I could not really tell if they were coroded or not so I drilled and tapped new outlets about 1 inch up from the back side of the tanks. Reinstalled hooked everything up and walaa the boat runs great.
Thanks again for the help!!!