<snip> I now have a question
about backfiring upon deceleration... what's the best
way to test a fuel cutoff solenoid and microswitch?
If either is the culprit, can they be replaced without
removing the Spica pump?
I just used a small test light bulb on a long (speaker) wire that runs into
the cockpit where I can see when the light as I drive. The bulb is hooked
to the solenoid and ground. What you end up with is a light that flashes
on when the cutoff solenoid is activated and goes off when the solenoid
goes off. After my diagnostic, I just left the bulb installed - it
provides an ongoing performance of the cutoff and microswitch operation,
particularly the resumption RPM of fuel flow.