Question about 1985 Chevrolet Chevy

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Engine bogs down

I have a 85 chevy truck with a 350 and a Edelbrock carb. At first it wouldnt start, figured it was the fuel pump. Got it on and it starts fine now. Now when I reach about 30 mph it bogs down bad. Thought it might be the fuel filter, so I removed it and just ran the line back into the carb(I know its probably bad for it) but I thought that would tell me if the filter was clogged. No dice. Should I be looking for a vacuum leak?

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I would adjust the carb, then I would check the float and the needle and seat on your carb. make sure your air filter is clean. check the timing.

Posted on Mar 06, 2009

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If I understand this right, you had this problem, changed the intake and carb, and still have the same problem, virtually unaffected by the new carb and intake.
My first suspect would be the fuel tank, especially if the car sat for a long time before you started driving it AND now you are using modern fuel which has a tendancy to start "cleaning" things. Being an 81 and that this is an intermitant problem and you are also complaining about the gas guage acting funny, I would drain and clean the tank. The sock on the end of the pickup tube could be falling apart or clogged up. If it is in fact breaking up or letting other junk through to the pump, clean and test if not replace the fuel pump. Personally, I would stick with an electric but it needs to be a decent one and not subject to junk coming from the tank, no pump can hold up to that. For a cheap temporary fix to help ID the problem, put another clear filter before the pump to see what's coming from the tank. If you don't want to put out the $$ for a Holley Red Label or equiv pump, make sure that the output is adaquate. Carbs like low pressure, high volume. Cheap pumps try to up the pressure in order to get the necessary volume and don't work well on a carb which relies on a mechanical float to regulate fuel. The regulator you installed will control pressure but do nothing for a lack of fuel volume at the carb which is the first thing I would suspect.

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I would imagine you have HEI (elecronic ignition) which usually works or it don't so I wouldn't mess with that. I would check the plug wires though. If they are getting grungy, just change em. Otherwise, make sure nothing is loose. Check for a spot where heat or rubbing has worn through a wire, perhaps more than one.
Look around to see if the fuel is getting hot. Did you use a thick gasket under the carb? Is there anywhere around the engine that the fuel line, especially a metal one, could be too close to a major heat source.

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