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1973 Challenger with a mild build 440.

Mopar Muscle
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1973 Challenger with a mild build 440.

Batman7713 Batman7713
New User | Posts: 1 | Joined: 07/08
Posted: 09/01/12
09:22 PM

Hi all,

I took my Challenger to a Wensday night drag at the local track and I have DOT tires I run on it. The first pass I did my burnout just fine, got to the light and when the light turned green I hit it hard and the car launched nice but then fell flat, I let up on the peddle and hit it again and it did the same thing. The car did it three times before it took off down the track. I have a 750 eddelbrock (new) on it. Pulled the top off and reajusted the floats next pass the car ran good. But every pass after that if fell flat 3 times before it would go. More info it has hooker headers, the original 5/16 fuel line from the tank, clutch fan, 40 over stock pistons, Lunati Cam Duration 262/268, Lift .475/.494, and stock rockers. The car did this every pass the rest of the night. Is it vapor locking or what? Any ideas as to what to try would help me alot. Thanks Jeff  

Garys69RR Garys69RR
User | Posts: 99 | Joined: 03/12
Posted: 09/08/12
07:38 PM

Sounds like carb is running out of fuel. Check fuel filters, pump volume, etc. My 451 in a 69 RR ran fine at the track, and thats with a new stock mech pump and new filter.  

Garys69RR Garys69RR
User | Posts: 99 | Joined: 03/12
Posted: 09/08/12
07:40 PM

Do you race at Bandimere in Morrison, Co? Thats where I go on wed nites.  

RBolig RBolig
Moderator | Posts: 948 | Joined: 12/03
Posted: 09/11/12
07:17 AM

Are your floats set high enough?

Maybe you need to adjust the cam on the squirters to get a little longer shot.  

Some people are like Slinkys; they're not very useful, but fun to watch when pushed down the stairs.

jerryg7 jerryg7
New User | Posts: 37 | Joined: 08/08
Posted: 10/10/12
06:18 PM

check the line into the fuel tank. A friend of mine had exactly the same problem with a 340 challenger but found a cracked fuel line going into the top of the tank...I'd just guess as others are saying that you are starved for fuel somewhere.  If I remember correctly my buddy said there was a plastic part there somewhere that had a crack in it (but I could be wrong...all I know is that this was his issue and it was at the fuel tank.)  

69_340_GTS 69_340_GTS
Enthusiast | Posts: 535 | Joined: 06/09
Posted: 10/11/12
04:07 AM

Not enough gas. I'd go to a bigger accelerator pump squirter, and also adjust the accelerator pump linkage to yield more gas, quicker. The carb should have come with tuning instructions. I've found that they are usually built more for economy than for racing, and usually need quite a lot of adjustment for maximum performance.