Carb. question
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Carb. question
I have a 74 f100 302 with a edelbrock 650 carb and intake. It will start up fine but if i try to give it gas, it will die. It will run if i barely touch the throttle, but if i go any further is when it dies. I took the air cleaner off and sprayed some carb cleaner in it and ran it for a few minutes and no change. It sounds like it is sucking more air than fuel. I tried adjusting my idle screws to no avail. I dont know a whole lot about carbs and i was wondering if it was a problem with the carb, fuel pump or filter. The plug wires were changed along with the distributor cap and rotor button. Plugs were not changed(parts guy gave me the wrong thread size) points have not been changed yet, but are in need of it. Is there anything else i can check to help?
Elder User
Joined: Jun 2010
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From: High Point NC
id say fuel pump is first place to trouble shoot....and its not imposible to get a new pump that doesnt work these days. 2nd check and or replace all your fuel filters and turn it over with the preshure side of the pump disconected from the carb and see if your getting a nice solid stream of fuel.
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Joined: Nov 2008
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From: Halifx Pa
Were I would look also. My carb was in serious need of an accelerator pump. Would fire up and idle nice, but give it ANY gas, and it spit sputtered and stumbled on it face till you let off of the gas. However, a vacuum leak can produce similar symptoms, and could be a real easy fix too.
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ok, checked the fuel pump. it would shoot a big squirt of fuel out at start up, then nothing. So i changed the fuel pump, changed and adjusted the points, and changed the spark plugs. Now she wont fire over at all. it will start up with carb cleaner. It is getting sufficcient fuel to the carb at the lines. Is the accelerator pump on top of the carb beside the barrell?
ok. after a little while the truck has started up and runs good at idle, but again with touching the gas just a little bit it starts to die out for a second, then it revs up, but its not running 100%. Its real sluggish and doesnt have a lot of power. Have decided that a carb. rebuild would be the best thing, finding trash in the fuel when i removed the fuel line to check fuel pressure.
ok. after a little while the truck has started up and runs good at idle, but again with touching the gas just a little bit it starts to die out for a second, then it revs up, but its not running 100%. Its real sluggish and doesnt have a lot of power. Have decided that a carb. rebuild would be the best thing, finding trash in the fuel when i removed the fuel line to check fuel pressure.
Senior User
Joined: Jan 2008
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From: Palatka, Florida
my truck did that same thing off of idle.
Then i looked and i had my vacuum advance hooked to manifold vacuum and not carb.
Swapped them out and now its good.
Then i looked and i had my vacuum advance hooked to manifold vacuum and not carb.
Swapped them out and now its good.
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Logistics Pro
Joined: May 2010
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From: Regina, Saskatchewan
I'm re-doing the carb on my 351W right now. It's just a simple 2100 Autolite carb.
The accelerator pump diaphram on your carb is probably toast... I know mine was (ripped, torn, rusted, and not very manuerverable).
My accelerator pump wasn't even pumping anything into the throat of my carb because it was so gunked up and beaten.
If I were you, I'd just rebuild my carb. It'll take maybe 2-3 days if you're fast (less if you have a faster acting de-greaser/cleaning prodcut).
The carb kit I bought cost me a whole whopping $31.24. It's worth every penny to get my truck running right again.
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yeah, i thought i mentioned before i was going to rebuild the carb., but i have a wondering mind sometimes.. so i might not have, but im in the middle the carb rebuild- had to stop for a little bit now, it started to rain. but the accelerator pump operated fine and i saw no signs of a problem with it, spring was good, rubber gasket or seal in it was in good shape, but there was a tremendous amount of trash in the carb. So right now im thinkin im gonna end up flushing the gas tank out. I do have a good cleaner, i cant think of the name of it off hand, but it works in about 30 min. It didnt get all the dirt burned on the surface of, but its not my carb, i was told dont worry about it. but it did clean it up pretty good, it got all of the gunk out from inside, made it look like brand new. But thanks for the help guys, it might have also had a little vacuum leak cause the bolts to the manifold werent tight at all, but my carb cleaner test didnt show anything with that, but that dont mean it didnt have a vacuum leak there.
Logistics Pro
Joined: May 2010
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From: Regina, Saskatchewan
I'm not in too much of a hurry, but yet I am haha.