Car stalls after pass

Casper302

Casper302

Club Member
351 Windsor, 950 hp holley, bg 280 pump.

Engine wants to stall after a pass at the track or street. Plugs look good, it acts like its loading up and boggs the motor down. It just started doing this. Car idle's fine and makes good power, just has this issue. Have had the carb rebuilt, new plugs, timing set and nothing has worked. Any ideas?
 
Is the butterfly (throttle) too tightly adjusted closing off air too much? Are you using some sort of stepper motor?
 
Fuel might be rushing to the front of the carb and when you let off from full throttle and killing it??Thats why you see guys with the little rubber tubes and the carbs at the track some times,just a guess.
 
dante1120 said:
Fuel might be rushing to the front of the carb and when you let off from full throttle and killing it??Thats why you see guys with the little rubber tubes and the carbs at the track some times,just a guess.
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Yep, make sure the splash gaurd/vent tube is installed correctly inside the secondary bowl. And this is the reason some guys use 2 90* spark plug boots, witha peice of steel tube between the float vents with hole drilled in the top. Keeps the fuel slosh from going down the carb.
 
What does the fuel pressure look like when this happens? I have duel 750s on mine and it used to do that. We took them off, and shined a flashlight thru the secondaries and opened them up just so the light began to shine thru. That was enough to keep it running when you took your foot out of it.
 
dante1120 said:
Fuel might be rushing to the front of the carb and when you let off from full throttle and killing it??Thats why you see guys with the little rubber tubes and the carbs at the track some times,just a guess.
Click to expand...

I am gonna try this and see if it helps.
 
Prostreet72 said:
What does the fuel pressure look like when this happens? I have duel 750s on mine and it used to do that. We took them off, and shined a flashlight thru the secondaries and opened them up just so the light began to shine thru. That was enough to keep it running when you took your foot out of it.
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Around 7lbs just as it was set.
 
Ever figure this one out?

fuel bowls possibly running dry? Possibly click it off after a pass, and pop a sight plug out and make sure they're still full of fuel. Were the needle & seats replaced with carb rebuild?
 
82bird said:
Ever figure this one out?

fuel bowls possibly running dry? Possibly click it off after a pass, and pop a sight plug out and make sure they're still full of fuel. Were the needle & seats replaced with carb rebuild?
Click to expand...

It was the pump. I switched gauges and it would drop to 3lbs during hard acceleration and the bowls went dry. Switched pumps and the issue is gone.
 
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