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Where is the leak at? Is it under or near the engine? If so it may be the fuel filter. It may need tightening or need a new seal. If it is at the gas tank there are sealant kits where you mix two types of paste together and put it over the hole. Depending on where you live (near salt water) and the age of the truck it could be that your tank is rusted out and finding a good used one is the best bet. In between the tank and the engine is a fuel line that runs along the frame and sometimes there is a fuel filter there somewhere. Check it and any rubber hoses or loose hose clamps. Without knowing where it is though its hard to tell how to fix it.

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18y ago
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Q: Whats the best way to fix a gas leak on a 1988 GMC 2500?
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