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Where does air in the fuel come from

23795 Views 10 Replies 7 Participants Last post by  mjacks
How does air get into the fuel system? I thinking someware between the fuel tank and filter. After the filter if there was a leak wouldnt fuel leak out not air in?

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I have a rough idle, if a leak is comming from "While your running, air can be sucked into the fuel system from a failed "O" ring on the tank connection or the selector valve", would this be visible in a clear line running from the return rail up to the filter head?

great, I read though the post for clear line test but wasn't clear wether it would indicate where the air is comming from.

Thanks for the help!
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