This is very puzzling.
You have a spark, so we know you have power to the coil, yet the pump isn't working with the OPSS bypassed, but DOES work connected straight to the battery.
I'd definitely do as John suggests and check voltage at the coil. If you have 12ish volts at the coil, you should have enough oomph to run the pump (unless internal wire corrosion/wire size has created a significant voltage drop?)
Hopefully the smart kids will have some more ideas. I'm very curious what your coil voltage is.
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Tom
"Patina"
1977 Tartan 30
Repowered with MMI A-4 2008
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