23' Walkaround: 1995 Wellcraft Excel Fisherman (2003 200 HP Yamaha)

Description

Boat details:
A 1995 Wellcraft Excel 23F walkaround fishing boat equipped with a single, 2003 Yamaha 200 HP HPDI.
The vessel is well-equipped and has been well-maintained.
This vessel has been well-maintained for its life.
In the last few years, the following have been done:
-Hull/topsides painted with Awlgrip (date unknown)
-New T-top canvas (2022)
-New low pressure fuel pumps (2022)
-New VHF radio with 8' whip antenna (2021)
-Gear oil change (2021, 2022, 2023)
-Impeller (2023)
-New oil injection pump and in-line filters (2022)
-New VST mid-pressure fuel pump and filter (2024)
-New speakers (2024)
-New batteries (2024)
The vessel has two functional displays: a 7" Garmin chart plotter and a smaller Lowrance fish finder/depth sounder.
***The boat does not currently run as there is a voltage drop condition at the new VST mid-pressure fuel pump that was recently installed.***
I originally bought it as a project, but have run out of time to fix it and need it gone.
What has been tried:
-all wiring has been cleaned and tightened at the bus bars, batteries, fuse panels, etc.
-Many fuses were replaced-Kill switch was bypassed and tested
-New mid-pressure fuel pump (pump runs with key on, but loses voltage while cranking
-Engine has spark on spark tester; ignition pulse not tested-Engine has good compression
-Engine turns over strongly (two new batteries)I suspect the ECU is bad but don't have another to swap in to test. A new, used but tested as working, ECU can be had for 0-400 on Ebay.
There is no trailer included. The boat is currently in a slip in Shady Side, MD and the bottom is likely a bit fouled. The ship is paid through August.