So I have a bone stock 99'. New VP, lift pump (airtex style) and sending unit. Everytime my fuel level gets below 3/8 of a tank the truck hard starts. Today I didn't think I was ever going to get it to start back up. FP is 16 at idle. I have a mechanical fuel gauge ran into the cab with no isolator. What I have noticed is when the truck gets to the 3/8 fuel level the FP holds pretty steady after turning the truck off. It will gradually go down to 1-2 psi after 10 mins or so. Until that level, the FP falls pretty rapidly to zero when the truck is turned off. Once I fill the truck up the hard starts immediately goe away and the FP gauge acts normal again. What in the heck could this be? The only thing I can think of is a cracked suction line above that particular fuel level sucking in air. Leaving the fuel cap loose didnt help matters.