Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

No RPM increase

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von:
Sounds like it might have a fuel flow problem from the tank. I'd change the fuel filter(s) first and see if that helps. Or could be a weak fuel pump. The last resort, and I've had this happen before, is the mesh sock that's on the fuel pickup in the tank is getting clogged with sediment in the tank. If it is the best cure IMO is to remove the sock from the pickup and install an in-line filter between the tank and pump.

429bbf:
i forgot about it until von said something . my wifes car 1981 vette would do the same thing. if you held it to the floor in passing gear it run up about 85 to 90 then fall on its face and them rev full bore again. it was still under warranty.so we took it to the dealer and they found a bull duram sack on the screen.for the guys that dont know what that is .its what tobacco used to come in for folks that rolled there own smokes.dean

78anniversary:
Thanks for the info guys, unfortunately, I am out of town for work until the 11th.  So won't be able to dig into it until then.  Doesn't it stink how work seems to interfere with our hobbies?

78anniversary:
For anyone still following this thread.  I found one of the secondary metering rods came off of the hangar and was just sitting down in the bottom.  Problem solved. 

Cliff Ruggles:
Good news.  Had the same thing happen on my last outing to the track.  I changed metering rods and one fell off during the install and I didn't see it.  Had to abort the run....Cliff

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