I was replacing the fuel pump on a 1999 GMC Jimmy 4.3 engine 4 wheel drive when I broke what I thought was some sort of ventilation fitting on the opposite end of the tank fom the fuel pump. I repaired it by tapping my own fitting in the hole and hooked it back to the existing hose. The vehicle starts and runs fine but i'm getting horrible mileage and wonder if I created a problem. I can't find any information on the part except that a Haynes repair Manual says it's part of the EVAP system and their information is pretty vague. Thanks for any help. R. Brown

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Question about 1999 GMC Jimmy

I was replacing the fuel pump on a 1999 GMC Jimmy 4.3 engine 4 wheel drive when I broke what I thought was some sort of ventilation fitting on the opposite end of the tank fom the fuel pump. I repaired it by tapping my own fitting in the hole and hooked it back to the existing hose. The vehicle starts and runs fine but i'm getting horrible mileage and wonder if I created a problem. I can't find any information on the part except that a Haynes repair Manual says it's part of the EVAP system and their information is pretty vague. Thanks for any help. R. Brown

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Donald Tucker

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The original fitting had a check valve in it to prevent vapor from constantly venting into the charcoal Evaporative loss system. You should be able to buy another fitting or install an inline check valve to solve the problem. I don't know if it will affect your mileage.

Posted on Apr 03, 2011

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