Truck makes a moaning noise when it's cold outside.
What is your question?
When the temp gets down below 10 the trucks sounds like a dog bellowing a constant tone. It runs fine but is embarrassing. I suspect it's the fuel pump but I'm just guessing. I treat the fuel with anti-gel and I've changed the fuel filters. I have found that I have to treat the fuel a little more than called for or I get a low fuel pressure alarm on the dash. The noise only shows itself when it's very cold but the colder it is the louder it is.
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