car stumbles in the air!

TinSoldier 3215 · 06-05-2011, 12:01 PM

We are having issues with the car as soon as you release the trans brake and it leaves the line and starts in the air it hesitates and acts like it is out of fuel. We have change 3 different carbs and regulator, fuel pump, msd box, we have looked at rotor button, distributor cap, and when car lands to runs fine and comes clean out of water boxs. any input would be helpful. thanks

Bob Gullett · 06-05-2011, 12:29 PM

What car, engine, carb?

Jeff Lee · 06-05-2011, 12:49 PM

If it runs fine everywhere except "x", then "x" is the only issue.
Running out of fuel either due to pressure or just's uncovered or sloshing fuel where it's not supposed to be. Maybe a wedge plate will work? But you have to look at the whole picture.

TinSoldier 3215 · 06-05-2011, 01:38 PM

The car is a camaro, engine is a 350 and carb is a quadrajet. As far as Jeff's reply I don't understand what he's saying?? If the fuel pressure is off, then what should it be??

it has been 7lbs. When it comes out of the water box it has no hesitation, no stumble, it's just when u stage and go up on rpm's and release the trans brake button it hesitates and when it comes down and planes out, it runs great!!

Do you think it could be a fuel pressure issue?? Thanks for any response...

Dragsinger · 06-05-2011, 01:58 PM

Jones,

judging by your first post you have checked the basics for a bad part. So, it is reasonable to look at other items. [and do not mean any disrespect, just beginning the brainstorming process] begin looking at the entire package in a different light. That is to say, go back and look carefully at every small thing. Look at every wire, every ground, every terminal connection, etc.

One idea is to have someone else drive the car while you look and listen, might give a different idea of what is happening.

Bob Pagano · 06-05-2011, 02:00 PM

Fuel pressure or bad ground that only happens when you do a wheelie would be where I would start.

TinSoldier 3215 · 06-05-2011, 02:50 PM

And just to add the car is still in low gear. and I did have the trans brake button break on me and the wires touch. Do you think that the trans brake button by touching could have shorted sum thing out?

Thanks for the help.. I'm stumped.. it's in low gear in the air.

Ed Wright · 06-05-2011, 03:05 PM

Hmm, sounds familiar. Re-check all your grounds. That was my problem.

TinSoldier 3215 · 06-05-2011, 03:13 PM

Thanks Ed.

Jeff Niceswanger · 06-05-2011, 05:43 PM

Just to be sure its not a fuel issue, put the .149 ( bigger) needle and seat in the carb at the same float height as the previous ones. We have had that same issue before. If it gets alot better or cures the problem, you have a supply problem

06-05-2011, 12:01 PM	#1
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	car stumbles in the air! We are having issues with the car as soon as you release the trans brake and it leaves the line and starts in the air it hesitates and acts like it is out of fuel. We have change 3 different carbs and regulator, fuel pump, msd box, we have looked at rotor button, distributor cap, and when car lands to runs fine and comes clean out of water boxs. any input would be helpful. thanks

06-05-2011, 12:29 PM	#2
Bob Gullett VIP Member Join Date: Mar 2002 Posts: 1,106 Likes: 57 Liked 507 Times in 116 Posts	Re: car stumbles in the air! What car, engine, carb? __________________ 68 Chevy11 327 F/S

06-05-2011, 12:49 PM	#3
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: car stumbles in the air! If it runs fine everywhere except "x", then "x" is the only issue. Running out of fuel either due to pressure or just's uncovered or sloshing fuel where it's not supposed to be. Maybe a wedge plate will work? But you have to look at the whole picture. __________________ Jeff Lee 7494 D/S '70 AMX

06-05-2011, 01:38 PM	#4
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: car stumbles in the air! The car is a camaro, engine is a 350 and carb is a quadrajet. As far as Jeff's reply I don't understand what he's saying?? If the fuel pressure is off, then what should it be?? it has been 7lbs. When it comes out of the water box it has no hesitation, no stumble, it's just when u stage and go up on rpm's and release the trans brake button it hesitates and when it comes down and planes out, it runs great!! Do you think it could be a fuel pressure issue?? Thanks for any response...

06-05-2011, 01:58 PM	#5
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: car stumbles in the air! Jones, judging by your first post you have checked the basics for a bad part. So, it is reasonable to look at other items. [and do not mean any disrespect, just beginning the brainstorming process] begin looking at the entire package in a different light. That is to say, go back and look carefully at every small thing. Look at every wire, every ground, every terminal connection, etc. One idea is to have someone else drive the car while you look and listen, might give a different idea of what is happening. __________________ Larry Woodfin 471W

06-05-2011, 02:00 PM	#6
Bob Pagano VIP Member Join Date: Jun 2002 Location: New Holland, PA Mooresville,NC Posts: 1,163 Likes: 241 Liked 16 Times in 11 Posts	Re: car stumbles in the air! Fuel pressure or bad ground that only happens when you do a wheelie would be where I would start. __________________ Bob Pagano A/SA

06-05-2011, 02:50 PM	#7
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: car stumbles in the air! And just to add the car is still in low gear. and I did have the trans brake button break on me and the wires touch. Do you think that the trans brake button by touching could have shorted sum thing out? Thanks for the help.. I'm stumped.. it's in low gear in the air.

06-05-2011, 03:05 PM	#8
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: car stumbles in the air! Hmm, sounds familiar. Re-check all your grounds. That was my problem. __________________ Ed Wright 4156 SS/JA

06-05-2011, 03:13 PM	#9
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: car stumbles in the air! Thanks Ed.

06-05-2011, 05:43 PM	#10
Jeff Niceswanger Senior Member Join Date: Jul 2003 Posts: 894 Likes: 685 Liked 1,032 Times in 368 Posts	Re: car stumbles in the air! Just to be sure its not a fuel issue, put the .149 ( bigger) needle and seat in the carb at the same float height as the previous ones. We have had that same issue before. If it gets alot better or cures the problem, you have a supply problem __________________ Jeff Niceswanger 3740 SS