car stumbles in the air!

Tom Goldman · 06-06-2011, 09:32 AM

I've seen similar problems when the fuel pump is not low enough in relation to the tank.
when the wheelstand is high enough the pump momentarly starves,and then recovers as the car falls out of the wheelstand.

ron mattson · 06-06-2011, 09:57 AM

I just went through the same situation, on my car it was a loose power supply wire in
my switch panel, it would lose power then get power and peck like a miss at the top
of the wheelstand after that it would run great.

TinSoldier 3215 · 06-06-2011, 08:15 PM

The car did not do this until we made a change to the Bindo Terminator Button. Haves anyone had to make modification to the button maybe shorting out? We made the change only.

Jeff Goss · 06-06-2011, 10:14 PM

Change it out to the old button and see if problem persists. Can't imagine that button would cause the problem.

Dean Oliver · 06-06-2011, 11:11 PM

Like many others who have commented, I'm not convinced that you have a carburetor issue. If I were you, I'd probably be looking for some of the electrical issues that have been mentioned.

But, let's look at two things related to the carb to see if we can begin to determine what is at fault. First, what is your fuel pressure? A good ballpark number for most Q-jets regardless of builder is 7 psi max. You will need to verify your gauge reading by comparing it to a second gauge. Typically, if a fuel pressure gauge goes bad, it will just give you an incorrect reading and make you believe it all day long. Also, do NOT use the little 1" or so gauges that screw into your regulator port for your fuel pressure reading, especially a liquid filled one. I have seen more than one racer chase similar problems that ended up being a faulty fuel pressure gauge. Your gauge could be showing 7 psi but maybe you really have 10.

Next, what size needle/seat is in the carb? I've seen too big of a seat cause more problems that it potentially solves.

These are obviously not the only two things to look at, but just some brainstorming suggestions as someone else stated. Good luck.

Dean

TinSoldier 3215 · 06-08-2011, 11:10 PM

Going racing this weekend to see if we made the Right Moves!!!!

06-06-2011, 09:32 AM	#1
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,477 Likes: 893 Liked 883 Times in 237 Posts	Re: car stumbles in the air! I've seen similar problems when the fuel pump is not low enough in relation to the tank. when the wheelstand is high enough the pump momentarly starves,and then recovers as the car falls out of the wheelstand. __________________ Tom Goldman 1500 SG , 1506 STK

06-06-2011, 09:57 AM	#2
ron mattson Member Join Date: Nov 2005 Location: cloquet mn Posts: 467 Likes: 17 Liked 68 Times in 31 Posts	Re: car stumbles in the air! I just went through the same situation, on my car it was a loose power supply wire in my switch panel, it would lose power then get power and peck like a miss at the top of the wheelstand after that it would run great. __________________ Ron Mattson 5015 STK

06-06-2011, 08:15 PM	#3
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 did not do this until we made a change to the Bindo Terminator Button. Haves anyone had to make modification to the button maybe shorting out? We made the change only.

06-06-2011, 10:14 PM	#4
Jeff Goss Member Join Date: Nov 2001 Location: Burlington, WA Posts: 361 Likes: 1 Liked 0 Times in 0 Posts	Re: car stumbles in the air! Change it out to the old button and see if problem persists. Can't imagine that button would cause the problem.

06-06-2011, 11:11 PM	#5
Dean Oliver Junior Member Join Date: May 2002 Location: Stuttgart, AR Posts: 53 Likes: 1 Liked 0 Times in 0 Posts	Re: car stumbles in the air! Like many others who have commented, I'm not convinced that you have a carburetor issue. If I were you, I'd probably be looking for some of the electrical issues that have been mentioned. But, let's look at two things related to the carb to see if we can begin to determine what is at fault. First, what is your fuel pressure? A good ballpark number for most Q-jets regardless of builder is 7 psi max. You will need to verify your gauge reading by comparing it to a second gauge. Typically, if a fuel pressure gauge goes bad, it will just give you an incorrect reading and make you believe it all day long. Also, do NOT use the little 1" or so gauges that screw into your regulator port for your fuel pressure reading, especially a liquid filled one. I have seen more than one racer chase similar problems that ended up being a faulty fuel pressure gauge. Your gauge could be showing 7 psi but maybe you really have 10. Next, what size needle/seat is in the carb? I've seen too big of a seat cause more problems that it potentially solves. These are obviously not the only two things to look at, but just some brainstorming suggestions as someone else stated. Good luck. Dean

06-08-2011, 11:10 PM	#6
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! Going racing this weekend to see if we made the Right Moves!!!!

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