Rewire? Hmmm. No, sir. I haven't changed any components over towards Bosch format except for the fuel pump and plumbing.

I only added a pigtail to the fuel pump connection that normally runs to the Bosch under-car pump. I got this car from a friend that died and he had already bodged the pump into place. I gave him a spare pump (since bought a new one) after he told me he installed a low pressure pump into the tank and it wouldn't run anymore.

At this point, both pumps are new, but I believe the sender inside the tank is somewhat misoriented or has a problem with the pump installation. Last week after leaving it overnight to drive a friend home, I started it up and it died on me a few seconds later. After a long-crank attempt, it started and stayed running in place for 10 minutes, so I drove it to a nearby fuel station. It took 10.4 gallons, which is not empty but close enough that a goofy in-tank setup might cause issues. I drove it home and had no issues for about 10 miles.

I was thinking about tapping the relay coil to avoid needing to run any substantial amperage. When I look at that diagram in the FAQ I linked, a second time, I really don't know what exactly that Relay element is and I might be drawing power from somewhere else in that circuit. The last thing I want to do is damage the ECU.


I wonder what would happen if I connected a 12V lantern battery to energize the pump relay coil to both the + and - pins of the fuel pump coil only. That wouldn't be grounded to the system and *shouldn't* have any potential to flow power through anything but the small coil. I wonder if I could even use a 9V battery to do it. I'll bench test one of the relays and see if it will move the coil.

As usual, thanks for your reply, Bill.
-Will