My 92 k2500 6.5 starts hard after it sits for over an hour. the longer it sits the longer it takes to start. I replaced the lift pump but it didn't change anything, It will still crank for 10-30 seconds before it starts. None of the fuel lines are wet and theres no visible leaks. Lately theres been a few times where it wont start at all but if I leave it for the night it will start in the morning. Im thinking its most likely the IP but i dont know for sure (possibly injectors?). I wanted to make a post before I tear it appart and have a $1000 project on my hands. It gets fuel to the filter but theres a slight bit of suction when I take the fuel cap off. Im also going to drop the tank and replace the sock on the sending unit and clean the tank out. Its an old plow truck with 195k on it but I want to make sure it starts this winter so any additional advice is appreciated.