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78' 245 no start fuel problem 200 1978

Hello all, Any help will be appreciated Thanks,

Problem: no fuel to injectors

History: Bought not running sitting approx. 1 year

Changed fuel filter, installed prepump and put in fuel pump relay.
started smoothly, ran strong, just a bit of white smoke.

Flushed engine oil put on new filter. started up again,no worries

Will not start turns over but doesn't fire up.
Checked
already: Spark is good, fuse panel cleaned
Checked for vaccum leaks. found none.
Both fuel pumps are working and fuel relay is clicking.
Manually set timing by Haynes book.
Opened system relay and appeared to be slightly corroded but not
charred and it didn't smell toasty like the bad fuel relay.
Cleaned grounds on fuel inj. sys.

How do I check the power to the pressure regulator and would the frequency valve cause a no start problem like this.

Thanks






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