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.	mario	7-2-09
That question is directed towards Frank...
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.	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.	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.	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.	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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