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I have a 95 c1500 with 4.3 vortec and you can smell gas fumes and has horrible gas mileage. Would could I try?

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Check fuel pressure. I'm betting it will fall like a rock once the vehicle is shut off. Typically the fuel pressure regulator is the problem. It is located on the back side of the CPI unit. The upper plenum will need to be removed in order to replace the regulator. This is a very common problem.

Posted on Nov 02, 2012


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SOURCE: I'm smelling gas fumes outside my car. I can

vapor recovery system, should clear itself, some liquid fuel got into the vapor system. Avoid topping off the fuel tank.

Posted on Jul 11, 2009

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SOURCE: Smell of gas fumes underneath vehicle near fuel tank

this sounds like a gas pressure regulatur. a few minutes after starting,you start smelling fumes,and are getting bad gas mileage right?

Posted on Jul 16, 2009

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I have 95 Dodge Dukota runs good but misses and smelles like gas when driving and gas fumes bad when truck is turned off

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94 4.3 vortec getting horrible gas mileage why???

Go to You Tube Video to find the problems
with that motor & the solution
A local repair shop can check bulletins in their
data base for the fix also
Most likely intake gasket,if you use Dex Cool
It eats gaskets & the vehicle is old ,so you can expect
to be constantly working on it

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My car is starting but not right away,i have to hold the gas down sometimes! what could be the problem?

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If these items don't help, then you might try changing the IAC (idle air control) module mounted onto the front of the throttle body. It's about a $50 item.

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1 Answer

1987 Isuzu pick up 2.3 . Carburetor runs much to rich. My gas mileage has gone from 27 mpg to 17 mpg. You are also able to smell the fumes due to the carb. not running properly.

It's either a stuck float or the choke is staying closed. If you're smelling gas, then it's probably the float. You need to rebuild the carb.

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Buick regal 92 3.8L Horrible fuel mileage

Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.

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Smell of gas fumes underneath vehicle near fuel tank

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Idle low then hi, and gas smell, and bad gas mileage

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