Gas smell and mileage
06-30-2006, 06:08 PM
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Gas smell and mileage I have a 94 Z that just turned 146,xxx miles and runs great but every now and then I get a strong gas smell inside the car. It seems to do it when it gets below a hlf tank of gas. I have checked for leaks but nothing and have replaced the gas cap. Also I drive on the highway mostly and can't seem to get more than 20 mpg. I hear of people getting anywhere from 22-26 mpg so what gives. The only thing I've done is LTs no cats, GMMG exhaust and a tune. The rear is stock 3.42s. It has new plugs and GM wires and a GM opti (new) So is this normal??
07-02-2006, 10:49 PM
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Same boat here. Not so much when running, but after I shut it down..wow...smells of gas bad. More of a fume smell, than a "wet" gas smell, if that makes any sense. I have not found any gas leaking anywhere. Drives me nuts. 
07-03-2006, 08:24 AM
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I am ASSUMING: Pull vac line off fuel presure regulator at back of intake on pass side, most likely diapham is leaking and gas is getting in intake through vac line. I would scan for codes.
07-07-2006, 11:28 PM
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I have no codes and no emissions. (No cats, egr, and air pump) Been all turned off. For some reason I really notice it either after I just filled it up or when it gets to a 1/4 tank. I have pulled off the pres. reg. vac line while idling and no difference. I was told though to do a smoke leak test in the tank. Possible crack somewhere in the tank filler tube??? I do have 150, xxx miles with the original pres. reg. if that makes a difference??
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07-08-2006, 02:34 AM
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Originally Posted by LS1Silverado05
Same boat here. Not so much when running, but after I shut it down..wow...smells of gas bad. More of a fume smell, than a "wet" gas smell, if that makes any sense. I have not found any gas leaking anywhere. Drives me nuts.
