96 Chevrolet G30 fuel problem.

Asked by GuruG1 Mar 16, 2017 at 03:45 PM about the 1996 Chevrolet Chevy Van G3500 RWD

Question type: Maintenance & Repair

I changed fuel pump  then it ran rough   loke it
wasnt getting enough fuel. Also alot of black
smoke   spitting and sputtering.  What do I do?

3 Answers
220,925

Rowefast answered 7 years ago

What size it this engine? I'm suspecting the spider assembly has leaking injectors and or the fuel regulator. You would need to do a fuel pressure bleed down test to determine if that is the problem.

Mark helpful
220,925

Rowefast answered 7 years ago

A TBI on a '96? I though '95 was the last year for that. Anyway, I guess what I would do is to check the fuel pressure. Fuel pressure should be 9 to 13 lbs. The reason being is it is typical that the fuel pressure regulator spring gets week. The fuel pressure regulator is in the top of the TBI, and they make rebuild kits for them. If all is good there then look at the spray coming out of the 2 fuel injectors. It should be a nice cone shape mist coming out. No droplets of gas at all. Could have dirty injectors.

Mark helpful

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