56napco

Well, found out the hole is a blind hole and went ahead and put a heli coil in and seems to be holding. Apparently I'm the only one this has ever happened to...

2002 GMC Yukon XL, 6.0L. So, today I found the rear bolt that holds the oil cooler lines to the oil pan above the oil filter is stripped out in the oil pan. Has anyone installed a heli coil or maybe put a longer bolt in? Are these holes drilled through into the pan or are they blind holes? I'd like to try and fix this without pulling the oil pan if possible.

The main reason I wanted to know is so I know my fuel system is working correctly and what to expect. I'm not fully convinced it's working the way it should based on the gauge readings and number of gallons it will take to fill.

Ok, so the manuals say exactly what is already posted. I understand what a predetermined value is... what no one can seem to tell me is what that acutal value is. Is it 1/4 tank, 1/2 tank, empty?

What is the predetermined level that the primary tank needs to reach before it will turn on the secondary tank pump? Will the secondary pump fill the primary tank fast enough to show on the gauge?

My 2002 Yukon XL has dual fuel tanks and this is the first truck I've owned with this style of tank setup. I haven't been able to find anything on how these tanks work, there isn't anything in the factory repair manuals. When does the aux. tank pump turn on? Does it continuously fill the primary tank or when the primary tank reaches a specific level? Will the gauge move when the rear pump turns on or does the gauge stay in one spot until the rear tank is empty?