[Ron Fowler]

I have a 750 Quadra Jet on my 400 cu. S/B Chev.If the Car sits for 2 days or more I have to grind and grind before it will start.
I believe the fuel is leaking out the Ports on the bottom of the carb. If this is the case What is the fix and what material should I use to fix it?
hank you
Ron Fowler

 

[BadBowTie]

Ron, I had the same Probem a while back on my q-jet. I tried all the fixit parts they sold that were replacement plugs. I tryed jbweld and other adheasives, and even melting some solder onto the leak. with no luck
I ended up buying a rebuilt carb from Autozone that works ok, but the Idle adj. screw threads in the carb were striped out. plus it was just a crummy rebuild any way. I've had serious troubles with the inlet valve in my carb. It has stuck in the open position and flooded the carb and spilt fuel over a hot engine, along with sticking shut, because the rebuild company was too cheep to put a little snap on hook thingy that pulls the needle valve up when the float drops. (sorry it just really ticks me off at the poor quality of parts that can be sold)
Sorry I dont' really have any suggestions on what will work except a new or a HIGH quality rebuilt carb might save some time and hassles of things not working.
hope someone else has some ideas

 

[liquid_larry]

I have found that with todays fuel anything with a carb that sits for a few days is hard to start, the fuel evaporates out of the carb. I used to blame the carbs but have found it doesn't make any diff what kind it is they all do it. The only cure I know of is an electric fuel pump.

 

[jimoo]

Hey Ron . Also have problem with that also. I just replaced the fuel filtre in carb inlet. It is there to stop fuel from returning to tank. Also pump the throttle twice before starting it will let high idle & choke to warm the engine.I hope this mite be your fix as it was mine!

 

[Dave K]

In a word... EPOXY!

Hmmmm... well, depending how much you're willing to spend on fixing this carb I'd say just get a good rebuild locally and avoid the AutoZone/Advance/Whatever remans 'cause they're almost ALWAYS minimal quality and workmanship. When in a similar situation myself, even my local parts house recommended me to get my Q-Jet rebuilt instead of buying one of their off-the-shelf wonders... like, wonder how many times it'll be returned?

If you can't find a re-builder in your area that you trust I personally recommend SMI (Sean Murphy Induction) here in Huntington Beach--- they know their stuff and won't steer you wrong. They do mail order rebuilds be it stock, custom or high performance racing. Give 'em your specs and you won't regret it.

had my '86 Q-jet done there and I think it cost me around $280, but in your case you'll have to bump for shipping. Good luck!