I replaced the fuel pump, rebuilt the carb. it will start,idle, but if you try to go, it dies. i can pour gas into the carb and it will start again,but still not go down the road. my boss suggested that i replace the rubber fuel lines to the gas tank and the fuel pump. i haven't trid this yet, i just got tired fooling with it and stopped driving it. if you have any suggestions ples let me know i would like to drive it again, i know, if i don't work on it it won't fix it's self. thank you for your help
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1. The accelerator pump in the carb is clogged, the linkage is unhooked, or the diaphram in the pump is bad. It's cheap to replace and comes in the carb rebuild kit. This usually just causes hesitation when you step on the gas pedal. It doesn't usually cause the engine to stop running.
2. More likely is that the main jet in the carb is clogged. At idle, high vacuum under the closed throttle plate in the carb causes fuel to flow thru the idle jet. As the throttle plate opens (as you step on the pedal), the vacuum under the plate dissipates, stopping the flow of fuel thru the idle jet, and the vacuum ABOVE the throttle plate increases, which is supposed to then draw fuel from the carb bowl thru the main jet in the carb. If the main jet is clogged with dirt, then it can idle just fine and die as soon as you step on the pedal.
that year car doesn't have a lot of computer control of air mixture like newer cars do so i would look for the butterfly of that carb to be letting too much air thru while idleing. If just rebuilt did the butterfly get cleaned good? Is there a build up of deposits around the ends of it? This will let air thru and cause the problem you describe. Happened to me on a 1985 Toyota. If this helps please reply cause ithelps me continue to answer questions here and good luck
your uncles olds probably has a 425 or a 455 engine in it. anyways, your carb, either 2 barrel or 4 barrel, is 24 years old and is in need of an rebuild. you call call around for an estimate or buy a carb already rebuilt and that should solve your problem. the older carbs will not have the same emissions fittings/hardware and would probably not pass an emissions test.
you may have a gold coloured filter that screws into your carb. Unscrew it and check to see if you can blow through it. It may be clogged. Also you can check for fuel at carb by loosening the fuel line going into the carb. Crank engine after loose. Should have gas coming from it.
If that is carbureted, and has a mechanical fuel pump, try running a length of fuel line from inlet side of pump to a gas can that has fresh, clean fuel, and if it runs good that way, you know problem is most likely in the tank. Removing the tank & cleaning it out is best solution from there. I'd even be tempted to add a small bottle or 2 of Lucas Fuel Sytem Cleaner to first fill in clean tank, just to help clean lines as well as carb.
I had a similar problem and it turned out to be the rubber fuel lines being old and cracked. The hoses would warm up and fuel would squirt out of the cracks. I had to replace three fuel line hoses and it has been running great ever since. Good luck.
Have you done a back pressure test on it? If you have no idea what I'm talking about, unbolt exhaust at heads or before the catalitic converter/converters. Try starting then driving it then. If that solves your problem, your catalitic converter/converters are clogged.