350 chevy carb.

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350 chevy carb.

Home > Discussion Forum > Mechanic's Corner (general)

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All Messages in Thread	Author	Date
350 chevy carb.	Jerry	10-25-01
I have a problem of getting fuel. Changed filter, new gas pump and cleaned carb. Stll the van will idle but will stall out when you try to give it any gas. Any ideas
Re: 350 chevy carb.	Jmerritt	10-26-01
I have a problem of getting fuel. Changed filter, new gas pump and cleaned carb. Stll the van will idle but will stall out when you try to give it any gas. Any ideas Jerry, When you say you cleaned the carb did you rebuild it. If not, and depending on how old the carb is or since it was last rebuilt, it could be as simple as a bad accelerator pump. With the engine off operate the accelerator and look in the venturi to see if fuel is sprayed in a continuous pattern out of both jets. Shouldn't be any breaks, sputter, etc., and if there is probably a rebuild is in order. Electrical problems in the ignition can cause problems, but not usually in acceleration unless the advance mechanism isn't working properly. If the distributor is a vacuum advance type, check the vacuum connections and on GM HEI a common problem is rusting of the advance mechanical unit at the top of the rotor shaft under the rotor. Remove it and spray with WD40. These rust and keep the advance from working properly which will cause stumbling and stalling on acceleration.
Re: 350 chevy carb.	Kent	10-26-01
I have a problem of getting fuel. Changed filter, new gas pump and cleaned carb. Stll the van will idle but will stall out when you try to give it any gas. Any ideas Jerry, 90% of carb prolems are electrical. If, as the poster says, the carb's accelerator pump is supplying a good shot of fuel, but the engine stumbles and won't rev, then you have a weak spark. Your vehicle most likely has HEI ignition, so you could have a bad coil, it's in the cap, bad connections on the module inside the distributor, the big orange wire on the side of the distributor has a bad connection, or the rotor may have a hole burnt right through the center of it. The HEI system will make about 60,000 open circuit voltage, so it can burn holes where there shouldn't be any.
Re: 350 chevy carb.	Jacob	8-13-09
Ok So i am driving my Chevy El Camino (350 crate woot woot) anyways while driving on the highway the RPM meter begins to dance around 1000 to 3000 but no change in sound or speed. As i slow down it kicks a lil but only for about 2 kicks. I have since drove it for about a week and while driving up the hill I live on The Car drops to maybe 300 RPM’s and wants to die so I put my foot on the gas about 1/2 throttle and it shoots right back up no issues, well I pull down the hill and I take my foot off the throttle to let it coast down the hill and it dies right as my foot leaves the throttle. So i push my el camino home, 3 blocks woohoo..... and it won’t start. Turns over, battery good lights work etc. But when I take a look at the QuadraJunk (jet) it looks BONE DRY. So i put some fuel in the carb and might i add steam rose as i did, got in gave it a choke and it started right up and idled at 600 (perfect spec for 86 elco) so I’m thinking wtf and I put it in drive to take it home and as soon as it drops into drive, DEAD! So i sang a sweet french tune probably killing off many puppies haha and I call my friend to pick me up and drive me down to the Gas station. Even tho I knew I had 10 gal in the tank I wanted to make sure. So i put 5 gal in the tank and put some more gas in the carb, once again steam rose. So i tried to start it and the damn thing wont start. So as I sit on the starter I push on the throttle, Starts right up no issues and idles perfect again so I say humm I guess I did run out of gas.... well I drop it in drive and it dies. So I flip off my friend that said I ran out and gas and I try to start it again. Once again it only started when I push at least 1/2 down on throttle. So as soon as I drop it in drive I push on the throttle and it drives all the way home and as soon as I take my foot off, it sputters than dies. So I started it again the same way and I rev it and it revs fine everything going well, I drop it in Drive and it dies. I have checked connections and I am at a loss. The carb is brand new and I really am tired of spending so much money on simple issues. So my question is simple What is causing it to die while in drive unless I have throttle held down?
Re: 350 chevy carb.	gail	6-26-04
What causes 350 chevy engine to stall when it gets hot. fuel pump and catalytic convertor have already been changed.
Re: 350 chevy carb.	mario	7-2-09
That question is directed towards Frank...
Re: 350 chevy carb.	Jay	11-29-07
I just had a 350 rebuilt. When i run the engine it stumbles and shakes the truck at around 15 miles an hour. I have a new distributor, carburetor, spark plugs and wires, fuel pump. I have been told it could be the ecm or a bad wire to the distributor. I am looking at installing an msd this weekend.
Re: 350 chevy carb.	BoBo	10-26-08
Replaced a fuel pump on a chevy 350, car started from the residual fuel in the carb and then died out will not restart. Is there a possibility that the rod fell to the side of the pump in the install and is not connecting?
Re: 350 chevy carb.	Frank	6-24-08
I have a 1979 chevy tioga class c and it has a 350 engine. I have changed the fuel lines, new electrical fuel pump, mechanical fuel pump, fuel filters, New holly Carb, spark plugs and wires - I have been having problems with keeping the engine running and starting. At time it starts and runs great, but when traveling a distance it beggins by sounding like popcorn in the front and then shuts down. After that it won't start - engine cranks but just won't start. The fuel filter is full of fuel and the electrical pump is working. I have tried everything and seems that I have not solved this problem yet - What do you thibk this might be?
Re: 350 chevy carb.	Kent	10-26-01
I have a problem of getting fuel. Changed filter, new gas pump and cleaned carb. Stll the van will idle but will stall out when you try to give it any gas. Any ideas Jerry, When you say you cleaned the carb did you rebuild it. If not, and depending on how old the carb is or since it was last rebuilt, it could be as simple as a bad accelerator pump. With the engine off operate the accelerator and look in the venturi to see if fuel is sprayed in a continuous pattern out of both jets. Shouldn't be any breaks, sputter, etc., and if there is probably a rebuild is in order. Electrical problems in the ignition can cause problems, but not usually in acceleration unless the advance mechanism isn't working properly. If the distributor is a vacuum advance type, check the vacuum connections and on GM HEI a common problem is rusting of the advance mechanical unit at the top of the rotor shaft under the rotor. Remove it and spray with WD40. These rust and keep the advance from working properly which will cause stumbling and stalling on acceleration. Au contraire re; weak ignition not causing acceleration problems. It is during acceleration that the heaviest demand, (read highest voltage requirement), is placed on the ignition system. Why?, because that's when cylinder compression pressures are highest, as opposed to at idle or closed throttle when pressures are lowest, resulting in lowest voltage demands from ignition system. A little time on the 'scope will show if the ignition is the cause of the problem.
Re: 350 chevy carb.	mario	7-2-09
Did you ever find out was wrong with your 79 chevy, my engine just started doing the exact same thing. Any help would be greatly appreciated thank you...

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