Just a followup on this issue.
I have been all the way through the breather line. No check valves anywhere and 98 3500s didn't have the evap system.
It's a really long breather and fill line that is mostly horizontal. Transfer pump fill and return are factory routed into it as well. Those are the lines on the right side of the picture going to the double tee section. $57 for that piece of plastic from the dealership. Jerks.
Using a carefully calibrated piece of broom handle and c-clamp, I raised the breather line. It is now even or above the fill line all the way.
Replaced transfer pump.
Back tank now transfers just fine. Filling the front tank is still real slow but not quite as bad as was before. Instead of putting in gas with an eyedropper, I can fill it at turkey baster speeds.
It's not fixed, but may be about as good as I care to get it. For it to be better, I think fill and breather would have to be shortened, and the transfer lines given a dedicated tank inlet. Maybe a separate breather line with a ball valve on the side of the truck would help.
I think it's just bad engineering.
I have been all the way through the breather line. No check valves anywhere and 98 3500s didn't have the evap system.
It's a really long breather and fill line that is mostly horizontal. Transfer pump fill and return are factory routed into it as well. Those are the lines on the right side of the picture going to the double tee section. $57 for that piece of plastic from the dealership. Jerks.
Using a carefully calibrated piece of broom handle and c-clamp, I raised the breather line. It is now even or above the fill line all the way.
Replaced transfer pump.
Back tank now transfers just fine. Filling the front tank is still real slow but not quite as bad as was before. Instead of putting in gas with an eyedropper, I can fill it at turkey baster speeds.
It's not fixed, but may be about as good as I care to get it. For it to be better, I think fill and breather would have to be shortened, and the transfer lines given a dedicated tank inlet. Maybe a separate breather line with a ball valve on the side of the truck would help.
I think it's just bad engineering.
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