My truck keeps dying when I stop

[Chevytruck70]

My truck runs good and starts right up.... It runs good and stays on when is on parking but as soon as I run it and stop at at sign stop or I stop accelerating it shuts off... What's the problem... Here's a pic of my carb
Posted via Mobile Device
Posted via Mobile Device

[buddylj1990]

its most likely the bad brake booster when u mash brake it causes it do draw to much vacuum

[buddylj1990]

lamest terms when applying brake its drawing all the air from brake booster instead of drawing air and gas from carb

[geezer#99]

It's not your booster. The evidence is on your carb by the accelerator pump. Your float level is too high and it's flooding a bit.

[buddylj1990]

let me know what u find out had same problem and it turned out to be booster .but do u have to apply gas when trying start it after it shuts off and is it to the floor when my flooded out i would have to hold it to floor to start it

[whiskey_marc]

Originally Posted by geezer#99

It's not your booster. The evidence is on your carb by the accelerator pump. Your float level is too high and it's flooding a bit.

Buy a rebuild kit for your carb. geezer#99 is right, your float level is too high so your fuel bowl floods out and stalls your engine when you slow down. Rebuild the old girl. The kit will show you how to set your float level properly, or you'll be able to find a thread on the site!

[SCHRUMGMC]

What causes it to die when you press the pedal down and it dies, and a little while after it starts up again

[Chevytruck70]

So what if is the brake booster..What should I do to fix it?
And if is the float level.. How do I fix it?
Posted via Mobile Device

[buddylj1990]

dose it just do it when u apply brake dose the truck smell like its running rich like excessive gas odor when running from exhaust

[MARKDTN]

Originally Posted by Chevytruck70

So what if is the brake booster..What should I do to fix it?
And if is the float level.. How do I fix it?
Posted via Mobile Device

I agree with the rest, but to answer your question on the booster, here is how to test it. Remove the vacuum hose from the booster at the intake and cap it off snugly. Drive the truck-REALIZING THAT IT WILL BE HARD TO STOP without boost assist!-allowing extra space to stop. If the same symptons remain it is not the booster.

[wreckedchevy]

I had a similar issues seemed electrical at first cause it was just like somebody turned off the key, in the end I found a buddy with an extra carb threw it on the truck and it cleared up the issue so I offered him a $100 and away I went. carb's are really easy to swap if you know somebody who might have a loaner anyhow

[geezer#99]

X2. More info needed.
When it quits does it start right up or hard to start with black smoke out the pipe.

[Chevytruck70]

When it quits starts right up.... When running I gave no issues but I soon as I stop at a stop sign it quits... But if is on P stays on.
Posted via Mobile Device

[Chevytruck70]

Here's my 1970 chevy c20
Posted via Mobile Device
Posted via Mobile Device

[Chevytruck70]

Posted via Mobile Device

[geezer#99]

THen it's not flooding!
Could be a vacuum leak. Check all the vac hoses for splits. Spray some carb cleaner around the ends of the hoses. If it runs speeds up the idle you've found a leak.
To eliminate the booster as a problem pull the vac hose off where it connects to the carb or manifold and plug that nipple. Test drive carefully (brakes will be harder to stop truck) and see if it dies. If it still dies then hook the booster back up.
Let us know and we'll go from there to find your cure.