Apparent Fuel leak down on my '88 (4.3)

[JohnO356]

Well, this truck has been great for over a year now, but all good things come to an end.

If the truck sits for a few days it's hard starting. Needs a tap on the gas while cranking and she'll fire right up. Always runs great, though. I'm thinking fuel pump or injectors, and I bought a new Delco pump, but have held off with the installation hoping another symptom might appear that will help pinpoint where the fuel pressure leak down is occurring. It's not a big deal now, but it bothers me.

Any of you guys have a better/closer guess than me based on experience, or is there a good way to check the problem out and hopefully pinpoint it. I hate just throwing parts at vehicles.

I rebuilt the throttle body 4-5 years ago and put in new injectors at that time. The truck had ~42,000 miles on it then and has ~75,000 now, mostly highway.