The Stovebolt Site Forums The Shop Area Engine Shop 4 bbl Quad - No Fuel

I have a 4 bbl Quadra on a 307 Olds Y engine (not orig carb, non-electronic) A friend helped me rebuild it about 4 years ago. About a week ago, it would not start without pouring gas into the carb, then would run fine. The bottom plugs were sealed when it was rebuilt. I changed the fuel pump, and after that it would not remain running after pouring gas into the carb. I removed the fuel line and it is pumping fuel, I removed the fuel filter even though it looked OK, still will not remain running. I do not see any jets of fuel when the accel is depressed. I noticed that the accelerator pump rod was stuck down. I cleaned and loosened up but still not running. Do you think its the Accel pump or float? Why would switching the fuel pump make it completely cease to run? Is it hard to take just the top off to check these out?

Thanks
Mike Glavin

It sounds like you need to pull the carb. & o-haul it. You can take the top off & check it out. Kind of depends on your expertise & how hard it is to reach. What part of Mo. are you in.

You can take the air horn (top cover) off the Qjet without taking it off the car. I'm betting that the float has hung up. There is a little plastic spacer that sits on top of the float valve and around the main metering rods. This may be hanging up the float, or the needle just has crud on it.

The old fuel pump may have been providing more pressure to the float, helping it open. The new one may be more in spec and it's not enough to overcome the sludge in the carb.

If the accelerator pump is stuck that may be an indication that the carb is full of sludge and needs to be cleaned out.

Qjets aren't terribly hard to overhaul. Doug Roe has a good book about them.

Thanks guys, I'm going to try and tackle it today. Wrenchbender, I'm in central Missouri near the Capitol city.

MAG600