Sudden Stop shutdown
Thread Starter
Burning Brakes
Joined: Sep 2010
Posts: 799
Likes: 26
From: Lexington Park Maryland
Sudden Stop shutdown
Several months ago I had the 750 CFM holley re-built on my 1972 LT1, but not satisfied how the car ran with it. A buddy had a year old newer version installed that, at first it had a flat spot from the idle. I adjusted the accel pump, that took care of the problem. However, during my test drive if I get on the throttle and then stop quickly the car wants to die down to 3-500 rpm but picks back up.
Fuel delivery is not my strong point, hence looking for some help.
Fuel delivery is not my strong point, hence looking for some help.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Check your float levels. If the rear one is a little high, it could slosh over and be flooding during a quick stop. Same for the front if it's a touch low- uncovering the jets and leaning it out.
After the engine has been running, shut it off and remove the sight plug from one end. Shake the car- gas should just barely creep over the threads. Repeat for the other end. Adjust until the fuel level is right at the bottom of the sight plug.
After the engine has been running, shut it off and remove the sight plug from one end. Shake the car- gas should just barely creep over the threads. Repeat for the other end. Adjust until the fuel level is right at the bottom of the sight plug.
Thread Starter
Burning Brakes
Joined: Sep 2010
Posts: 799
Likes: 26
From: Lexington Park Maryland
Check your float levels. If the rear one is a little high, it could slosh over and be flooding during a quick stop. Same for the front if it's a touch low- uncovering the jets and leaning it out.
After the engine has been running, shut it off and remove the sight plug from one end. Shake the car- gas should just barely creep over the threads. Repeat for the other end. Adjust until the fuel level is right at the bottom of the sight plug.
After the engine has been running, shut it off and remove the sight plug from one end. Shake the car- gas should just barely creep over the threads. Repeat for the other end. Adjust until the fuel level is right at the bottom of the sight plug.
I found a video by holley, but the narrator was a speed talker. but I did catch, if the fuel level is too low the float should be raised. I guess I am bouncing my findings in here for verification.
Last edited by newbie2vette; Aug 6, 2013 at 08:05 PM.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Put a wrench on the nut, and a large screwdriver in the slot. It won't take much to break the nut loose. When it's loose, hold the screw and turn the nut clockwise, then tighten the screw down on top of it. Same to raise the level, but turn the nut counter clockwise. If you have clear sight plugs, the fuel level should be right at the bottom.
Thread Starter
Burning Brakes
Joined: Sep 2010
Posts: 799
Likes: 26
From: Lexington Park Maryland
Put a wrench on the nut, and a large screwdriver in the slot. It won't take much to break the nut loose. When it's loose, hold the screw and turn the nut clockwise, then tighten the screw down on top of it. Same to raise the level, but turn the nut counter clockwise. If you have clear sight plugs, the fuel level should be right at the bottom.
