Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Surging in high gear

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trw:
Just rebuilt a 17080212 "800" quadrajet with Cliff's kit and recipe.
Pulls like a freight train in second.
In 4th it starts surging at about 4000-4500 rpms.
what did I do wrong
Thanks
Terry

77cruiser:
How's the fuel supply? Is this at WOT?

trw:
Stock 73 Corvette fuel supply and yes at WOT.
No fuel pressure gauge.
The pump is only a couple of years old and worked with the stock Qjet.
It is a 489 with about 500 hp.

Cliff Ruggles:
A stock mechanical pump would be hard pressed to keep up with that kind of power.  Our kits contain the high flow N/S assembly unless you ordered a "basic" kit and did not specify that you needed the high flow seat.

With a .135" seat installed the carb will easily support 500hp if fuel delivery is adequate.......Cliff

trw:
I have the larger N/S.
How can I test to see if fuel delivery is adequate.
Would adding a small electric pump at the tank do any good? I have one laying around the garage.
Should I just get a high volume mechanical pump?
Thanks
Terry

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