Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Fuel deliver, and a brass float

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Cliff Ruggles:
441 heads have good ports but the big combustion chambers. With flat top pistons probably in the 9 to 1 range, not 10 to 1. 

I'm not fond of rubber hose and clamps on the pressure side of a fuel pump.  At a minimum put a "bulge" in the steel lines so the hose doesn't slip off and burn the vehicle to the ground.

The .135" high flow seat should be plenty for what you are doing.  Most store or Internet purchased kits come with a tiny N/S assembly and have now for at least 20 years......

Cliff Ruggles:
PS:  your distributor port to the VA is blocked.  If you are using the port below it in the baseplate it woln't work for VA, move it back to the port in the main casting just to the right of the fuel filter hsg....

lightning boy:
Be sure to check the sock in the tank and check the pick up tube for obstruction. Put a gauge on it tape it to the windshield see what it's doing.
like Cliff said .135 seat.
Make sure the fuel line is not too close to headers.

Gizmo:
Thanks for the feedback.

Yeah I always flare the ends on steel lines when the rubber line clamps on.

That port on the carb with the VA hose connected, I remember tracing it back to a port just above the throttle plate, so assumed it was the VA port. I'll move it to the other port.

The fuel tank sock is new, I ran 3/8 line all the way to inside the tank with a new sock.

I'll made a few modifications as suggested and see how it goes.

Glenn

Kenth:
Like Cliff said the port on baseplate wont work for distributor VA, this port is for the EVAP system and vacuum signal too weak for VA.
Also, the port beside fuel inlet on this unit is full manifold vacuum and wont work well for the VA with a hotter than std camshaft.
I have found the best remedy is to cover the port slot in baseplate with marine tex or equivalent epoxy and drill a .040"-.060" hole to cavity just  above the throttle blade at idle speed position of the blade.

HTH

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