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1999 Chevrolet S-10 Base Reg Cab 108 WB Xtreme

1999 Chevrolet S-10
Trim Info:
Rear Wheel Drive, Reg Cab 6' Fleetside
23 mpg city / 29 mpg hwy
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August 19, 2013, 10:50 pm

Matt R

Question: Where is my gasoline going??

I have a 1991 chevy s-10.
While my gas gauge and oil pressure gauge don't always function properly, I've kept track of my gas usage by miles since I bought the truck. Recently, I ran out of gas when I KNOW I should have had 1/4 to 1/2 a tank. I thought maybe someone siphoned it. I put a half of a tank in it, and my gas gauge clearly showed a half a tank. I drove the truck home, and parked it showing a half of a tank on the gauge. The next time I drove it, several days later, my tank was empty. I'm sure it's not being siphoned. I am getting a slight gas smell to my engine oil, but when I changed out my oil, the correct level was drained, no extra.
My question I guess is what is going on here?? How am I loosing gas when the engine isn't running??
Is it possible for my fuel pump to keep running and pouring gas into my engine block? Would a bad gas cap and high ambient temps allow that much gas to evaporate? How do I troubleshoot this? I am pretty handy


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