Re: Truck turns over but won't start
Another thing to check is the suction line from the tank to the frame line. About a year ago, a mouse chewed holes in both of my suction lines, (dual tanks). Had the rather irritating situation of having fuel starvation at the carb with two full 20 gallon tanks.
Your planned test should narrow things down.
Pretty sure that the 3/8" is the suction and the smaller is the return. My 75 doesn't have the return.
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