Cliff's Quadrajet Parts and Rebuild Kits
Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: lakedrifter on December 23, 2015, 02:30:26 PM
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I know you guys have seen this issue a time or two but I need to pick some brains anyway.
I'm aware of the hard starts after sitting for awhile and the well plugs leaking and letting the fuel bowl go dry, but I don't believe that is my case. The last time I had my carb apart I drilled and tapped the well plugs, per some other post I had seen.
The issue I am having is when trying to start 30 minutes or so after I have shut the engine off. You have to crank and hold the peddle down and then it will fire up.
If you let it set for a couple hours, it starts back up just fine. No peddle required.
Any info is always appreciated.
Heath
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Certainly the symptoms of some fuel leaking into the intake after shut-down. Did you pressure test the bottom plugs after the repair?.....Cliff
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Float level? Possible that the inlet needle & seat are leaking.
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No, I had not heard of pressure testing the float bowl? Is there an easy way to do that?
I'll have it off today again so, i will check the float level again.
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One of the other problems i have had is poor warm ups. I havent been able to quite dial it in. While working on the van today i noticed that my efe canister did not close when i started the van earlier. I tested the efe with a vacuum pump and it operates correctly. So i started back tracking and figured out it works off of ported vacuum. With the TPVS now in question, I tested the vacuum at the vacuum advance and found less than -10lbs ov vacuum. Does anyone know what the vacuum should be at the advance on a cold start? Im wondering if the TPVS is out and maybe stimulating some of what i percieve to be carb problems?
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I figured it out. It was a vacuum leak!
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Good news!