Q-jet Fuel Pouring out
 

I am new to these Qjet carbs and I put one on the car and as soon as i turned the fuel pump on, fuel came running out of the vent tube and out of the part that plunges in the front bowl (i think that what it does) when you open up the throttle. Sorry to sound like a rookie but is something stuck or broken?

Thanks,

JP

Re: Q-jet Fuel Pouring out
 

Sounds like you have something sticking like a float or a needle /seat has a piece of dirt or silicone/tape stuck.. Carb needs to be taken apart & checked for dirt in needle/seat or hole/crack in float... When you take everything apart, lay on a towel & put back the same order ? Check main fuel inlet on front or side of Q-jets for silicone or dirt/tape in their ??? Good luck & take your time they are pretty simple to work on !!!!

Re: Q-jet Fuel Pouring out
 

Also check your fuel pressure; QJ's do not like excessive fuel pressure.

Re: Q-jet Fuel Pouring out
 

If the carb has been sitting for a while the needle will dry out especially of you are running racing fuel. Let the carb sit for a half hour or so with fuel in it and try again. Cut the fuel pressure back to 6 lbs and try. My car runs good at 6 lbs.

Re: Q-jet Fuel Pouring out
 

And be very careful with these problems. This is what my Holley was doing when a spark started an engine fire. Toasted my wiring but other than that, alls OK.

Dale

Re: Q-jet Fuel Pouring out
 

Please share what you found wrong. Thanks

Re: Q-jet Fuel Pouring out
 

If you are referring to me, I had the float adjusted too high and it didn't cut off the flow of fuel into the carb. It just pumped like a fountain until it caught fire.

Holley has you remove the sight plug and turn the adjustment until fuel trickles out the bottom of the hole. I have clear sight plugs now but they are for adjustment only and don't stay on the carb.

Those Push-Off switches are there for a good reason. Killed my pump and let us deal with the fire. Always know where your fire extinguisher is.

Dale

Re: Q-jet Fuel Pouring out
 

I think he was referring to the people who come on these various forums who want and need help, and then you never hear back from them.

Re: Q-jet Fuel Pouring out
 

In the early 70's, we used clear p'glass and a dial ind..to set the
float level. Depending on launch it was accurate and dependable.
Bob

Re: Q-jet Fuel Pouring out
 

I'm sorry, but I forgot to say to use Viton needle+seats and
NO Teflon tape @ the inlet. An extension for the front vent
tube is helpful.
Bob

Re: Q-jet Fuel Pouring out
 

I was hoping JP Schuster had some words of wisdom, about his Q-Jet problem.

Re: Q-jet Fuel Pouring out
 

Nothing yet, guys. I apologize. I slapped my spare carb on for now and it was fine. I do appreciate The help with fuel pressure. I think that could've been one of my problems. The carb was completely fresh but sat without fuel in it for about a year, so I think i will take it apart and see if anything is stuck. Sorry to keep you guys waiting! I will respond as soon as I get some time to take it apart.

Thanks for all your help!

JP

Re: Q-jet Fuel Pouring out
 

Hey guys, just another update:

Being the rookie that I am with these carbs, I looked right past the fact that the needle and seat could be stuck... It was a fresh Q-jet, however it sat for a number of months before actually getting to put it on.

Nonetheless, I was told to tap the front of the carb, pulse the fuel pump for the initial filling of the bowl, then let it rip.

Sure enough, no leaks.

Thanks everyone for their help and technical expertise! It was just a simple fix (or procedure) that got me back on the right track.

Thanks,

JP

Re: Q-jet Fuel Pouring out
 

Yep, knocked on quiet a few Q-jets over the years. :D If you take your stored carbs and run a little atf thru the needle/seat and accell pump after draining everything goes much smoother the next use.

Re: Q-jet Fuel Pouring out
 

If the Viton tip of the needle valve is dried out from age, etc. you will get it to work for a while, then it will leak again. I had this happen with Rochester 2-jets and new needles and seats fixed it.