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Q:

won't start after setting overnight or weekend (a week or two between no starts) on 1996 Ford F-350

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
after unit does start, starts and runs fine. when it doesnt start, cranking on and off for long periods (sometimes with jumpering from another truck) it will splutter and start. Sometimes comming back 4-5 hours later it will then start on first crank. After cranking 3-4 min can smell gas and can hear fuel pump in tank in ign on position. 3 things
1) right angle rubber hose on exhaust man pass side, replaced 2) smaller right angle rubber hose behind carb (fuel injection)and tubing goes on drivers side toward front of engine, replaced. 3) Engine sensor top rear of block was coated in oil it was in excess, wiped down. is the cold start sensor at this location and can it caused this type of problem. I don't have a code reader. (yet).
(2) Answers
(1) Comments
The ignition control module is on the left fender apron. It is surrounded in a heat sink. This module is similar in design to the "thick film ignition" (TFI) module that Ford had a class action lawsuit filed against them about. They are prone to failure under high heat conditions. The heat sink and "off site" location (the TFI's were originally on the distributor) helps increase module longevity. But it's still an area of concern.

I can't say it's that module, but I can say that you indicate fuel is present, and it's an intermittent failure, so it sound compelling to at least give some attention to the ignition module.

As always - testing is really what is needed. This vehicle - with OBDII -- should be easy to test for codes and check system parameters for operation and failure.