Question about Chevrolet Express

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I install a new fuel pump and wiring connector for a 1996 1500 chev. express van after starting engine it started running rough smoking black out of exhaust

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  • pande_1911 Nov 13, 2010

    the problem happen doing installing fuel pump van is a low mileage custom van

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Replace the fuel pressure regulator as well on the fuel line

Posted on Nov 14, 2010

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Hi, black smoke means your fuel mixture is running rich. You need to fix the fuel mixture if this is a carburetor engine you need to adjust or replace the carburetor. If this is fuel injected you must check the O2 sensors, fuel pressure, and computer sensors to fix the problem

Posted on Nov 13, 2010

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1 Answer

4.3 V-6 chev. no power


check your fuel pressure, and fuel regulator ,sounds like your fuel pump is on it's way out ,specially if you have over 100k mile

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Black smoke>fuel consumption>rough idle


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

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signs of a bad fuel pressure regulator. the vehicle runs rough, the engine will not start usually in the mornings. many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. black soot on plugs, blake smoke from tailpipe, running rough, stalling. you could have residue in fuel tank and need to change fuel filter again. have a very good day !!

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You say you replaced the fuel pump, what about the filter? If the filter is clogged it can cause this as can ignition. Since the car started for you after the fuel pump was changed the original problem was the fuel pump. But you should never change the pump without installing a new filter.

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Well if theres power going to the relay but not out, then you need a new relay. If theres power in and out of the relay, you might need a new fuel pump. The electric fuel pumps inside the tank are actually lubricated by the fuel as it pumps it, and if it runs dry long enough, it can burn out the pump

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